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Home My WebLink AboutPY6 Performance Evaluation Memorandum_Final 40 Shattuck Road | Suite 110 Andover, Massachusetts 01810 www.woodardcurran.com T 800.426.4262 T 978.557.8150 F 978.557.7948 MEMORANDUM PROJECT: Lexington, MA Phosphorus Control Plan PROJECT NUMBER: 0227871.16 DATE: June 2024 SUBJECT: MS4 General Permit Year 6 Performance Evaluation 1.1 Performance Evaluation Summary This memorandum documents the Town of Lexington’s Phosphorus Control Plan (PCP) Permit Year 6 Performance Evaluation. A Performance Evaluation is required by the Massachusetts Municipal Separate Storm Sewer System (MS4) General Permit Appendix F to evaluate the effectiveness of the PCP by tracking changes in phosphorus load through implementation of stormwater control measures (SCMs) and development/redevelopment in the Charles River watershed (the Watershed). Table 1 presents a summary of phosphorus exports and reductions. As described in more detail in the following sections, the reduction requirement increased from 535 lb/year to 536.3 lbs/year based on an updated watershed delineation and land use/land cover analysis. Given current non-structural and structural credits through Permit Year (PY) 6, the Town is on track to achieve its PY8 (June 2026) reduction target. There is a gap to achieve the PY10 (June 2028) reduction target, which can be met through the planned structural SCM project implementation and/or increased non-structural operations. TABLE 1: PERFORMANCE EVALUATION PHOSPHORUS LOAD SUMMARY (LB/YEAR) Permit Requirements Baseline Load 1,168 Allowable Load 633 Required Load Reduction 535 Updated Requirements Increase/Reduction due to Development (2005 to June 2024) 1.3 Updated Reduction Requirement 536.3 PY 8 (20% Load Reduction) 107.3 PY 10 (25% Load Reduction) 134.1 Credits through PY6 Non-Structural 1.9* Structural 108.5 Total 110.4 Remaining Phosphorus Load Reduction Gap PY 8 Reduction Remaining -3.1 PY 10 Reduction Remaining 23.7 Planned Credit Planned Structural 17.6 – 26.6 *Non-structural credit policy is anticipated to change with MS4 General Permit reissuance. Leaf litter/organic debris collection credit could drastically increase (over 70 lb/year) per Clean Sweep (UNH) credit policy recommendations. Lexington, MA (0227871.16) 2 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 1.2 Updates to Lexington’s Phase 1 PCP The following sections are organized to match the Phase 1 PCP. Section 3: Phosphorus Load Reduction Targets The MS4 General Permit requires permittees to estimate changes in phosphorus load due to development/redevelopment within the PCP Area annually. Changes in land use and cover impact phosphorus export loads. Therefore, development/redevelopment has been tracked within the PCP Area to account for phosphorus export changes. This information is further documented in Attachment 1. Lexington’s PCP Area includes the Town’s area within the Watershed, excluding non-traditional MS4 area (i.e. federal and state agencies). Lexington’s PCP Area changed in Permit Year 6 following a watershed delineation update. The MassDEP 2016 watershed delineation within Lexington was reviewed and updated to account for mapped drainage infrastructure connectivity. A figure showing the updated Watershed delineation and PCP Area is included in Attachment 1. Lexington’s baseline load was updated from 2005 to 2021 conditions using land use/land cover (LULC) GIS data developed by the University of Vermont in conjunction with the Charles River Watershed Association (CRWA), then updated from 2021 to current conditions (June 2024) on a site-by-site basis using building permit application data from the Town. These calculations are documented in the Baseline Load Memorandum, included in this memorandum as Attachment 1. TABLE 2: UPDATED BASELINE LOAD (LB/YEAR) 2005 MS4 General Permit Annual Baseline Load Updated 2021 Annual Baseline Load Updated 2024 Annual Baseline Load Difference in Annual Baseline Load 1,168.5 1,166.7 1,169.0 0.5 CRWA presented estimated changes in phosphorus loading from 2005 to 2021 for municipalities within the Charles River Watershed based on land use changes during a Phosphorus Control Plan Workshop on June 25, 2024. The CRWA estimated an increase in Lexington’s phosphorus load of 175 lbs/year, which presents a discrepancy between the updated baseline load documented in Attachment 1 and summarized in Table 2. Woodard & Curran, in coordination with the Town, will review the CRWA calculation and methodology and update its baseline load, as needed, during Permit Year 7. Section 4: Legal Analysis Section 4.2 of the Phase 1 PCP (Planned Updates to Regulations) states that the Town planned to update its Planning Board Zoning Regulations for new development to require the submittal of stormwater reports and long-term SCM operation and maintenance (O&M) plans for all major site plan review projects. This update went into effect on September 27, 2023. The Lexington, MA (0227871.16) 3 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 regulations are now consistent with the updated phosphorus removal and long-term O&M requirements in the Town’s Stormwater Management Regulations. On September 14, 2022, EPA announced decisive action to require privately owned commercial, industrial, and institutional properties with 1-acre or greater impervious cover located in the Charles River Watershed to seek coverage to reduce their phosphorus loads to the Charles River watershed under an EPA Clean Water Act permit. The authority to regulate these properties is referred to as “Residual Designation” authority (RDA). No action is currently required by these properties; however, EPA will develop a NPDES general permit covering these dischargers, and affected properties will be required to obtain permit coverage and begin to reduce pollutants in stormwater. As of May 2024, EPA’s estimated target issuance date for a draft permit is Fall 2024. It is uncertain if actions resulting from the RDA requirements will be implemented in time to impact the Town’s required reduction for Phase 1. However, it is anticipated that the RDA will ultimately support the Town in reducing phosphorus in the Charles River watershed and meeting MS4 General Permit requirements. Section 5: Funding Source Assessment Outside Funding Opportunities The Town reviewed and evaluated outside funding sources potentially available for PCP planning and implementation. A funding opportunities summary matrix is included in Attachment 2. Historically, the Town has funded PCP preparation and related stormwater efforts with Town Capital and O&M funds including General Funds and the DPW Administration and Engineering and Highway Division budgets. In order to minimize impacts to Town taxpayers, the Town plans to leverage outside funding sources. Some recent efforts and plans are summarized as follows: · In April 2024, the Town submitted a Municipal Vulnerability Preparedness (MVP) grant application to the Massachusetts Office of Energy and Environmental Affairs for the Valleyfield Wetland Restoration and Water Quality Enhancement project which would focus on planning and design to minimize flooding in the Valleyfield Street area and reduce stormwater related nutrient loading. As of preparation of this memorandum, awards have not been announced. · The Town plans to submit a Project Evaluation Form by July 26, 2024 through Massachusetts’s Department of Environmental Protection’s (MassDEP’s) State Revolving Fund (SRF) Asset Management Grant Program. If successful, this grant funding could be used to collect additional information on known stormwater assets, inventory stormwater assets including SCMs, review and update O&M plans, and assess flooding risk due to capacity constraints within the Town’s MS4 system. A full SRF application would be due in 2025 with work beginning in late 2025 / early 2026. · In the future, the Town may choose to leverage low-interest loan financing through the Massachusetts Clean Water Trust and State Revolving Loan Fund for the construction and implementation of SCMs which will result in direct reduction of nutrient loading. · As the Town continues to coordinate and collaborate with the Charles River Watershed Association (CRWA), there may be opportunities to apply for the Stormwater MS4 Lexington, MA (0227871.16) 4 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 Municipal Assistance Grant Program. For example, the Town could partner with CRWA and/or other communities within the Charles River Watershed to implement programs supporting residential SCMs, such as rain gardens, rain barrels, cisterns, infiltration trenches/chambers, and pervious driveways/walkways. The Town will continue to track other State and Federal funding opportunities as they become available and pursue them for eligible projects that may be competitive in the funding programs. Financial Capability Assessment The Town evaluated the costs of stormwater efforts and impacts to residents by conducting a Financial Capability Assessment (FCA) following EPA’s Clean Water Act FCA guidance. Conducting this assessment provides a basis should the Town determine an Alternative Schedule Request be submitted to modify the PCP implementation schedule, and helps the Town understand potential financial impacts related to MS4 permit compliance. The EPA specifically developed the FCA guidance for use in Clean Water Act schedule negotiations as a component to consider economic impacts of Clean Water Act controls. The FCA also provides the Town with key information to evaluate the affordability of compliance with Phase 1 PCP requirements. The FCA guidance provides two alternatives to assess a community’s financial capability when negotiating compliance schedules. Alternative 1 includes metrics that measure the financial impact on residential households, poverty, and overall financial capability of the community. Alternative 2 uses detailed financial and rate models to evaluate annual impacts of meeting CWA compliance requirements to residents and the financial condition of the community. The Town completed both alternatives and a complete memorandum detailing the results and additional considerations is provided in Attachment 2. In general, the results of the FCA show the Town’s strong financial capability to meet Phase 1 PCP requirements. When the current and projected stormwater and wastewater costs are evaluated alone, the Town’s high Median Household Income (MHI) makes the cost per household impact minimal. However, when considering all water costs (drinking water, wastewater, and stormwater), the cost per household is significantly higher at 1.00% of MHI. Additionally, factors impacting the Town’s overall financial capability have yet to be recognized in existing data and information. The Town’s overall debt burden is set to more than double in the coming years with the construction of a new high school, with total debt increasing from approximately $200M to $760M. When considering these factors, the outcome of several FCA indicators change and show the potential need for a schedule modification to meet PCP stormwater requirements. Section 6: Existing Stormwater Controls The following section presents a summary and phosphorus reduction estimate for existing non- structural, semi-structural, and structural SCMs. Lexington, MA (0227871.16) 5 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 Non-Structural The non-structural program has changed since Permit Year 5; however, the changes have not affected the existing non-structural SCM credit, which remains 1.9 lbs/year. During Fall 2023 and Spring 2024, due to favorable weather conditions, the Town was able to sweep the roads within the Charles River Watershed twice in the spring and twice in the fall. Despite the increased sweeping frequency, the enhanced sweeping program credit policy, outlined in Appendix F Attachment 2 of the MS4 General Permit, only provides credit for sweeping two times per year, monthly, or weekly. Therefore, even though the Town swept four times in PY6, it still only receives credit for sweeping two times per year. The Town also provided collected organic matter measurements for Fall 2023 and Spring 2024. These measurements are anticipated to support an updated non-structural SCM credit policy once the MS4 General Permit has been reissued. A draft of the reissued permit is expected by the end of 2024 or early 2025. Since this updated credit policy has not gone into effect, the potential increase in non-structural credit due to collected organic matter based on mass is presented in Section 7 of this memo: Planned Stormwater Controls. Structural The Phase 1 PCP captured existing structural SCMs. Adding additional SCMs that were constructed and/or identified since preparation of the Phase PCP 1 increases the existing structural SCM total to 108.5 lbs/year. Additional SCMs include: · Municipal: Seven municipal infiltration trench catch basin retrofits have been installed in the Watershed. The phosphorus reduction credit for these systems totals 4.6 lbs/year. As-built plans are included in Attachment 5. · Private: Building permit applications were reviewed to identify additional private structural SCMs. Properties with approved Certificates of Occupancy were reviewed to identify constructed SCMs associated with the development. The existing structural SCM credit calculations were updated to include this additional 4.4 lbs/year of phosphorus reduction. These calculations are included in Attachment 5. The existing structural SCM credit excludes SCMs that have been proposed and/or permitted but not yet constructed. Section 7: Planned Stormwater Controls Non-Structural The Town collected 300 cubic yards (CY) of sweeping matter in Fall 2023 and 80 CY of in Spring 2024. Based on the “Clean Sweep – Recommendations for New and Updated Credits for Street Cleaning in New Hampshire” memorandum, which is anticipated to inform the updated MS4 General Permit credit policy, the potential credit for these efforts is estimated to be 71.4 lbs/year. Calculations supporting this estimate are included in Attachment 3. The Town is in the process of purchasing advanced leaf litter collection equipment, including a truck-mounted vacuum that is controlled by the truck passenger. This vacuum will collect the bulk material, which will speed up street sweeping. The equipment purchase was included in Lexington, MA (0227871.16) 6 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 the Town’s annual budget, approved at the 2024 Town Meeting, and the Town plans to have this equipment available for use this Fall 2024. The Town is considering obtaining a scale at its composting facility, which can be used to measure collected leaf and organic debris mass. This purchase will be informed by the MS4 General Permit reissuance and updated non-structural crediting policy. The Town plans to include the compost facility scale in the next budget round (September 2024) as a future year request. Semi-Structural Town staff met on April 1, 2024 to discuss semi-structural SCM options for phosphorus reduction credit including creditable semi-structural SCMs (impervious area disconnection, impervious area removal, and conversion of low to high permeable pervious areas). Presentation materials are included in Attachment 4. Opportunities for implementation of semi- structural SCMs will be further assessed in Permit Year 7. Structural The Town is advancing design of SCMs identified in the Phase 1 PCP as potential opportunities on municipal properties. The locations of these SCMs and their design status are presented below. The Town will continue to advance the design and construction of these systems. A preliminary phosphorus reduction estimate range for these planned SCMs totals 17.6 – 26.6 lbs/year. These systems are anticipated to be constructed prior to PY10 to contribute to the required load reduction. · Jonas Clarke Middle School: Survey, wetland delineation, and subsurface soil investigations were completed at this site to support preliminary design of enhanced biofiltration system with internal storage reservoir (ISR). Preliminary design will be completed by Fall 2024. An estimated phosphorus reduction of 2.6 lbs/year is anticipated. · Bowman Elementary School: Survey, wetland delineation, and subsurface soil investigations were completed at this site to support preliminary design. Given the site’s proximity to wetlands, high groundwater, and large drainage area, an engineered wetland SCM is proposed. Preliminary design concepts will be coordinated with the Town’s Conservation Commission and Public Schools Department prior to finalization, anticipated Fall 2024. Per the Phase 1 PCP, an estimated phosphorus reduction of 4 – 6 lbs/year is anticipated. · Philip Road: Survey and wetland delineations were performed for this site in Permit Year 5. A preliminary design including proprietary Contech Jellyfish® filters was prepared based on a draft of the survey. The Jellyfish® filter is approved by the State of Washington Department of Ecology Technology Assessment Protocol – Ecology (TAPE) program for General Use Level Phosphorus Treatment. While the Jellyfish® filter is not currently an approved system in the MS4 General Permit for phosphorus reduction, the permit provides the option to propose alternative long-term cumulative performance information for structural SCMs not identified in Appendix F Attachment 3. Therefore, it is anticipated that phosphorus reduction credit for the Jellyfish® filter will be approved by EPA with performance documentation. The final survey was Lexington, MA (0227871.16) 7 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 provided after preparation of the Phase 1 PCP. A preliminary design will be completed by Fall 2024. An estimated phosphorus reduction of 6 – 8 lbs/year is anticipated. · Green Lane: This parcel will be assessed for a potential proprietary treatment system using available base information. Concept design of a proprietary system will be completed by Fall 2024. An estimated phosphorus reduction of 5 – 10 lbs/year is anticipated. · Valleyfield Street 1: The Valleyfield Street 1 site is located at the northern end of Valleyfield Street, adjacent to the cul-de-sac. A concept design for an engineered wetland was included in the Phase 1 PCP for this site. A land title review was performed to confirm the existence of Town “retention basin” easements. The site was also discussed with the Town’s Conservation Director, who raised concerns about known existing wetland features within the retention basin area. Since these retention basins were constructed prior to November 18, 1996, the effective date of the Massachusetts Stormwater Management Standards, these areas are protected under the Wetlands Protection regulations (310 CMR 10.02(3)). Therefore, retrofitting the retention basin areas will not be proposed at this time. Subsurface investigations will be performed within the right-of-way to determine other potential retrofit options. If a viable retrofit option is identified, a concept level design will be completed by Fall 2024. · Valleyfield Street 2: The Valleyfield Street 2 site is located between 42 and 50 Valleyfield Street. Survey, wetland delineations, and subsurface investigations were completed for this site to support preliminary design. Existing wetlands, high groundwater, and limited space are anticipated to constrain the potential retrofit opportunities at this site. Further coordination with the Town’s Conservation Commission will inform the preliminary design, which will be completed by Fall 2024 if a viable retrofit option is identified. Section 8: Operation and Maintenance Program for Structural Controls Municipal SCMs Town staff met on April 1, 2024 to discuss the Town’s SCM O&M program. During this meeting, John Zaccardi (Lexington Public Works Highway Superintendent) explained that Apex Companies (Environmental Partners) completes inspections of municipal SCMs, tracks data, and sends work orders to the Town. Then the Town, specifically the Department of Public Works, completes the work orders by performing maintenance activities, such as repairing structures and removing/adding vegetation, once a year. Work orders are tracked in the Town’s PeopleGIS platform. Environmental Partners conducted town-wide site visits and inspections of municipal SCMs in April 2024. A summary report documenting their findings is presented in Attachment 6. The report documents maintenance recommendations for each SCM. Private SCMs The following tasks have been completed to support the private SCM O&M program. The Town’s Stormwater Regulations require ongoing inspection and maintenance by property owners, and specifically require a Qualified Inspector to submit a written certification to the Lexington, MA (0227871.16) 8 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 Town by January 1st of each year documenting that proper maintenance of the structural SCM was performed consistent with the approved O&M plan. Tracking Town staff met on March 7, 2024 and again on June 17, 2024 to discuss the Town’s existing software and processes to track SCM implementation and O&M. The Town uses OpenGov (formerly Viewpoint Cloud) for permitting services. The Town decided to create a new permit application within the Engineering Department for Stormwater Control Measure Certifications. This application provides a submission form for commercial, industrial, and multi-unit residential (excluding single-family) for their annual SCM inspection and maintenance reports. This SCM Certification application requests confirmation of owner and or/property management contact information, SCM type, maintenance activities, condition assessments, and photos. Existing private SCM owners and or/ property managers will be informed of this new SCM Certification application through the education and outreach program described below, and new private SCM owners will be informed of it during their Engineering, Conservation, and/or Planning application process. Additionally, the Town is considering updating its New Construction Building Permit application process to request changes in land cover and land use when applicants submit as-builts. Requesting this information, and tracking it in OpenGov, will allow the Town to automate its annual baseline load update. Education and Outreach Private SCM Owner Targeted Outreach As part of a broader stormwater outreach and education program, described below, in Summer 2024, the Town will perform targeted outreach to non-residential private SCM owners. There are approximately 20 non-residential private property owners with existing, documented SCMs within the Watershed. First, an initial introductory letter will be mailed to these owners to make initial contact, provide an overview of required annual inspection and reporting, and request an in-person site visit. Follow-up communication via phone calls and emails will be conducted to schedule the site visits. The in person, one-on-one site visits will include Town staff and support staff from its engineering consultant, Woodard & Curran. During the site visit, the private SCM owners will learn about details of the SCM, information on the benefits of SCMs, ongoing operations and maintenance, and the annual inspection and reporting process. This will allow the owners to ask questions and receive specific direction and guidance on the process to result in a high response rate. Stormwater Communication and Education From March through June 2024, various departments in the Town (Engineering, Conservation, and Planning) and the Town’s Director of Communications collaborated to prepare a Strategic Stormwater Communication and Outreach plan (Outreach Plan). The Outreach Plan, included in Attachment 6, specifies the methodology and approach to perform effective dissemination of information associated with stormwater management, MS4 General Permit compliance requirements, water quality, and SCM maintenance. It outlines the key audiences for this information, identifies their respective topics of interest, presents key messages to emphasize, Lexington, MA (0227871.16) 9 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 and recommends engagement strategies and platforms. The intent of this Outreach Plan is to provide guidance on communicating to the general public about stormwater management and system maintenance, to elected Town officials about the compliance and financial impacts related to stormwater management, and to developers about stormwater design and system maintenance requirements. It provides a clear and streamlined approach for the Town to continue to advance MS4 permit compliance and stormwater initiatives while providing education, outreach, fostering collaboration, and communicating to interested parties. Section 9: Phase 1 Implementation Graphic 9-1 from the Phase 1 PCP summarizes the Phase 1 implementation schedule elements. This graphic has been updated based on programmatic progress made during PY6. Graphic 9-1: Implementation Schedule Elements Finally, the SCM retrofit cost component of the anticipated Phase 1 implementation cost has changed from PY5. The PY5 SCM retrofit cost included more SCMs than are now anticipated to be needed to meet Phase 1 phosphorus reduction requirements. The 5-year total Phase 1 implementation cost was estimated to be about $11.7M in the Phase 1 PCP, and it has been updated to be about $8.3M, as presented in Graphic 9-2. The updated SCM retrofit cost estimate is included in Attachment 7. Graphic 9-2: Implementation Cost Elements Year 7 June 30, 2025 Inspect & Maintain Municipal SCMs Continue Private SCM Education/Outreach Performance Evaluation Year 8 June 30, 2026 Inspect & Maintain Municipal SCMs Implement structural SCMs Performance Evaluation Year 9 June 30, 2027 Inspect & Maintain Municipal SCMs Implement structural SCMs Performance Evaluation Year 10 June 30, 2028 Inspect & Maintain Municipal SCMs Implement structural SCMs (totaling 24 lbs reduction) Performance Evaluation Complete Phase 2 Plan Non-Structural SCMs (Total) = $501,250 Municipal SCM O&M (Total) = $4,484,000 SCM Retrofits = $3,330,000 Total = $8,315,250 Lexington, MA (0227871.16) 10 Woodard & Curran, Inc. PY6 Performance Evaluation Memorandum June 2024 Attachments Attachment 1: Baseline Load Memorandum Attachment 2: Funding Documentation Attachment 3: Non-Structural SCM Documentation Attachment 4: Semi-Structural SCM Documentation Attachment 5: Structural SCM Documentation Attachment 6: O&M Program Documentation Attachment 7: Updated SCM Retrofit Cost Estimate Attachment 1: Baseline Load Memorandum 40 Shattuck Road | Suite 110 Andover, Massachusetts 01810 www.woodardcurran.com T 800.426.4262 T 978.557.8150 F 978.557.7948 MEMORANDUM PROJECT: Lexington, MA Phosphorus Control Plan PROJECT NUMBER: 0227871.16 DATE: June 2023, Revised June 2024 SUBJECT: Baseline Load Memorandum The U.S. Environmental Protection Agency’s (US EPA’s) National Pollutant Discharge Elimination System (NPDES) Massachusetts Small Municipal Separate Storm Sewer System (MS4) General Permit requires permittees within the Charles River watershed to account for and mitigate any phosphorus load increases due to development since 2005. This memorandum summarizes the methodology used to update the Town of Lexington’s baseline total phosphorus load within their Phosphorus Control Plan (PCP) Area. This memorandum reflects Lexington’s baseline load update using 2021 land use/land cover data developed by the University of Vermont (UVM) Spatial Analysis Laboratory in conjunction with the Charles River Watershed Association (CRWA). Additionally, this memorandum reflects an updated Charles River watershed delineation for the Town of Lexington. Finally, this memorandum summarizes the baseline load update from 2021 to current conditions (June 2024) on a site-by-site basis. 1. Watershed Delineation The Massachusetts Department of Environmental Protection’s (MassDEP’s) 2016 Integrated List of Waters (305(b)/303(d)) data layer was used to establish an initial baseline load in the Phase 1 PCP prepared by Woodard & Curran in June 2023. The MassDEP 2016 watershed delineation does not account for drainage infrastructure connectivity. Therefore, Lexington’s Charles River Watershed delineation was refined to account for catch basin connectivity and drainage system discharge/outfall locations, which alter the watershed delineation. A comparison of Lexington’s Charles River watershed area using the MassDEP 2016 delineation and the refined delineation incorporating drainage connectivity and discharge locations is presented in Table 1 below. This updated watershed delineation will be used in future PCP updates and stormwater control measure (SCM) designs. Lexington’s PCP Area and non- traditional MS4 area are described below. TABLE 1: LEXINGTON’S CHARLES RIVER WATERSHED AREA COMPARISON (ACRES) Delineation Source Total Urban Area Water Land Use Area Urban Land Area Non- Traditional MS4 Land Area Lexington’s PCP Land Area MassDEP 2016 3,208.8 71.3 3,137.5 397.0 2,740.5 W&C Refined 3,208.9 82.0 3,126.9 404.5 2,722.4 Lexington, MA (0227871.16) 2 Woodard & Curran, Inc. Appendix B: Baseline Load Memorandum June 2023, Revised June 2024 2. PCP Area The PCP Area is defined in the MS4 General Permit as being the PCP implementation area selected by the permittee. The Town of Lexington’s PCP Area excludes facilities or areas regulated under separate NPDES permits. These include non-traditional MS4s (i.e. federal and state agencies), such as the Massachusetts Department of Conservation and Recreation (MassDCR) and Massachusetts Department of Transportation (MassDOT). Lexington’s PCP Area was estimated by excluding the non-traditional MS4 areas from the total Town area within the Charles River watershed. The non-traditional MS4 area includes parcels and roadways. A figure showing the parcels and roads excluded from Lexington’s PCP Area is included as Attachment 1. 2.1 Parcels The non-traditional MS4 parcel area, excluded from Lexington’s PCP Area, was estimated to be about 76 acres. The non-traditional MS4 parcel area was estimated using the following MassGIS 2020 parcel data property type classification codes (Use Codes): 90 Public Service Properties • 901 – (Intentionally left blank) 91 Commonwealth of Massachusetts – Reimbursable Land • 910 – Department of Conservation and Recreation, Division of State Parks and Recreation • 912 – Department of Corrections, Division of Youth Services • 915 – Department of Conservation and Recreation, Division of Water Supply Protection • 917 – Education – University of Massachusetts, State Colleges, Community Colleges 92 Commonwealth of Massachusetts – Non-Reimbursable Land • 920 – Department of Conservation and Recreation, Division of Urban Parks and Recreation • 922 – Department of Corrections, Division of Youth Services, Mass Military, State Police, Sheriffs’ Departments • 924 – Mass Highway Department • 925 – Department of Conservation and Recreation Division of Water Supply Protection conservation restrictions and sewer easements, Urban Parks • 927 – Education – University of Massachusetts, State Colleges, Community Colleges 97 Authorities • 972 – Transportation Authority • 975 – Vacant, Transportation Authority 2.2 Roadways The non-traditional MS4 roadway area was estimated using roadway jurisdiction and right-of- way parcel data. MassDOT and MassDCR roadway area, totaling about 328 acres was excluded from Lexington’s PCP area. The non-traditional MS4 parcel and roadway area adds up to about 404.5 acres. Therefore, Lexington’s PCP Area is about 2,722.4 acres, as shown in Table 2 below. Lexington, MA (0227871.16) 3 Woodard & Curran, Inc. Appendix B: Baseline Load Memorandum June 2023, Revised June 2024 TABLE 2: LEXINGTON’S PCP AREA (ACRES) Lexington’s Total Charles River Watershed Urban Land Area Non-Traditional MS4 Area Lexington’s PCP Land Area 3,126.9 404.5 2,722.4 3. Baseline Load Update The MS4 General Permit utilized MassDEP’s 2005 land use/land cover data to establish baseline loads, and the Phase 1 PCP utilized MassDEP’s 2016 land use/land cover data. Lexington’s updated baseline load was calculated using the UVM 2021 land use/land cover data and Brown & Caldwell’s baseline load spreadsheet. The high-resolution 2021 data was prepared by the UVM Spatial Analysis Laboratory, in conjunction with the CRWA and funded by the MassDEP, to support regional planning and effective assessment of current phosphorus loads for municipalities within the Charles River Watershed. Brown & Caldwell developed a spreadsheet to calculate baseline phosphorus loads in accordance with the methodology used in the MS4 General Permit and consistent with an EPA memorandum authored by Mark Voorhees dated January 14, 2014. This baseline load update excludes non-traditional MS4 areas. Table 3 summarizes Lexington’s updated baseline load. The complete baseline load update calculation table is provided as Attachment 2 to this memorandum. TABLE 3: 2021 BASELINE LOAD UPDATE RESULTS (KG/LB) Updated 2021 Annual Baseline Load 2005 MS4 General Permit Annual Baseline Load Difference in Annual Baseline Load 529.2 / 1,166.7 530 / 1,168.5 -0.8 / -1.8 The 2021 baseline load update resulted in a decrease in annual baseline load of 0.8 kg / 1.8 lbs compared to Lexington’s 2005 baseline load documented in the MS4 General Permit. Table 4 presents Lexington’s 2021 updated baseline load and the updated phosphorus load reduction requirement. TABLE 4: 2021 ANNUAL STORMWATER PHOSPHORUS LOAD REDUCTION (KG/LB) Updated Baseline Phosphorus Load (2021) Allowable Phosphorus Load Phosphorus Load Reduction Requirement Percent Reduction in Phosphorus Load Updated Phase 1 Permit Year 10 Reduction (lb) 529.2 / 1,166.7 287 / 632.7 242.2 / 534.0 45.8% 133.5 To update the baseline load from 2021 to current conditions (June 2024), Woodard & Curran reviewed building permit applications for constructed development on a site-by-site basis. The Town shared building permit applications from 2021 through June 2024, and Woodard & Curran filtered this list of properties by those which have issued certificates of occupancy, indicating the project has been constructed. Woodard & Curran also reviewed available Lexington, MA (0227871.16) 4 Woodard & Curran, Inc. Appendix B: Baseline Load Memorandum June 2023, Revised June 2024 municipal roadway project plans to account for changes in impervious cover. An estimated 2.28 lb/year increase in phosphorus load was estimated for the changes in land use and land cover resulting from these projects. Table 5 below presents Lexington’s current (June 2024) baseline load and the updated phosphorus load reduction requirement. TABLE 5: JUNE 2024 ANNUAL STORMWATER PHOSPHORUS LOAD REDUCTION (KG/LB) Updated Baseline Phosphorus Load (2024) Allowable Phosphorus Load Phosphorus Load Reduction Requirement Percent Reduction in Phosphorus Load Updated Phase 1 Permit Year 10 Reduction (lb) 530.2 / 1,169.0 287 / 632.7 243.2 / 536.3 45.9% 134.1 Based on the updated baseline load, the Year 10 reduction requirement of 134.1 lbs/year represents an increased reduction of about 0.1 lbs compared to the permit requirement (134.0 lbs). The associated updated Year 8 reduction is 107.3 lbs, or an increased reduction of 0.1 lbs compared to the permit requirement of 107.2 lbs. These baseline load results will be updated as needed to account for future development/redevelopment and to report current baseline load conditions in MS4 Annual Reports. Attachments Attachment 1: Non-Traditional MS4 Area Figure Attachment 2: 2021 Baseline Load Update Attachment 3: 2021-2024 Load Calculations Attachment 1: Non-Traditional MS4 Area Figure Attachment 2: 2021 Baseline Load Update 2021 Baseline Load UpdateJune 2023, Revised June 2024A B A B C C/D D Unk Total A B C C/D D Unk A B C C/D D Unk TotalCommercial283.2 177.6 63% 0.4 1.2 57.4% 162.5 1.78 289.3 22.9 11.4 53.1 4.6 13.6 - 105.7 0.04 0.18 0.36 0.46 0.54 0.36 0.9 2.1 19.1 2.1 7.4 - 31.6 15.1 0.3 4.5 325.4 Industrial0% 0.4 1.2 0.0% 0.0 1.78 - - - - - - - - 0.04 0.18 0.36 0.46 0.54 0.36 - - - - - - - - - - - High-density residential208.3 91.4 44% 0.4 1.2 37.4% 77.9 2.32 180.7 82.3 12.8 5.6 14.3 1.8 - 116.9 0.04 0.18 0.36 0.46 0.54 0.36 3.3 2.3 2.0 6.6 1.0 - 15.2 13.5 0.1 1.8 197.6 Medium-density residential482.0 136.1 28% 0.1 1.5 15.0% 72.3 1.96 141.7 190.8 23.8 67.6 47.7 16.1 - 346.0 0.04 0.18 0.36 0.46 0.54 0.36 7.6 4.3 24.3 21.9 8.7 - 66.9 63.8 0.2 12.3 220.9 Low-density residential505.1 108.9 22% 0.1 1.5 10.0% 50.6 1.52 76.9 150.1 44.2 71.9 42.7 87.2 - 396.2 0.04 0.18 0.36 0.46 0.54 0.36 6.0 8.0 25.9 19.7 47.1 - 106.6 58.3 0.3 15.7 199.2 Highway14.8 6.8 46% 0.1 1.5 30.7% 4.6 1.34 6.1 2.8 1.5 3.4 0.1 0.5 - 8.1 0.04 0.18 0.36 0.46 0.54 0.36 0.1 0.3 1.2 0.0 0.2 - 1.9 2.2 0.2 0.5 8.5 Forest1069.1 9.5 1% 0.01 2 0.0% 0.0 1.52 - 262.0 368.7 155.6 21.1 252.2 - 1,059.6 0.11 0.14 0.19 0.21 0.23 0.19 28.8 51.6 29.6 4.4 58.0 - 172.4 9.5 0.2 1.5 174.0 Open land93.1 1.0 1% 0.1 1.5 0.1% 0.1 1.52 0.2 24.8 27.8 26.7 0.6 12.3 - 92.1 0.04 0.18 0.36 0.46 0.54 0.36 1.0 5.0 9.6 0.3 6.6 - 22.5 0.9 0.2 0.2 22.9 Agriculture66.6 0.7 1% 0.01 2 0.0% 0.0 1.52 0.0 16.2 43.8 3.8 - 2.2 - 65.9 0.07 0.29 0.60 0.76 0.91 0.60 1.1 12.7 2.3 - 2.0 - 18.1 0.7 0.3 0.2 18.3 Total2,722.4 531.9 20% 14% 368.0 694.8 751.8 534.0 387.6 131.1 386.0 - 2,190.4 48.9 86.2 114.0 55.0 131.0 - 435.1 164.0 36.7 1,166.7 Fill in these cells Total Avg Annual Phosphorus Load (kg/yr) 529.2 EPA-provided values (Source: EPA Memorandum, Authored by: Mark Voorhees, Dated: 1/14/2014, Entitled: Overview of Methodology to Calculate Baseline Stormwater Phosphorus Loads and Phosphorus Load Reduction Requirements for Charles River)Calculated valuesDisconnected Impervious AreaDisconnected Impervious Area(ac)Pervious Area Composite Phosphorus Export Loading Rate(lb/ac/yr)Avg Annual Phosphorus Load(lb/yr)Total Avg Annual Phosphorus Load(lb/yr)Percent ImperviousSutherland CoeffsPercent Directly Connected Impervious Area (%)Directly Connected Impervious Area (ac)Phosphorus Loading Export Rate (lb/ac/yr)Avg Annual Phosphorus Export Load (lb/yr)Perv HSG Area (ac) Phosphorus Export Loading Rate (lb/ac/yr) Avg Annual Phosphorus Export Load (lb/yr)Phosphorus Land Use GroupTotal Area (ac)Impervious Area (ac)Directly Connected Impervious AreaPervious Area Phosphorus LoadNOTES:1. This spreadsheet was developed by Brown and Caldwell to calculate baseline phosphorus loads in accordance with the methodology used in the Massachusetts Small MS4 General Permit. EPA documented the baseline phosphorus load calculations in the EPA Memornadum authored by Mark Voorhess and dated 1/14/2014.2. Only edit the yellow cells.3. Brown and Caldwell is providing this spreadsheet as a courtesy to third parties. Brown and Caldwell makes no guarantees or warranties about its accuracy. You are responsible for verying all calculations. If you identify any issues, please contact Matt Davis (see contact info below)4. This spreadsheet is valid only for calculating baseline phosphorus loads. The calculation of current loads is performed using a different methodology and phosphorus export loading rates.5. For a detailed discussion of how baseline phosphorus loads are calculated, please watch the recorded video from the Charles River Watershed Association Phopshorus Control Planning Workshop #1 that was held on 3/8/2022.6. Please contact Matt Davis at Brown and Caldwell if you have any questions. Email: mdavis@brwncald.com. Attachment 3: 2021-2024 Load Calculations CLIENT:Town of Lexington, MassachusettsPROJECT:Phosphorus Control PlanDESIGNED BY:CJDATE:6/13/2024CHECKED BY:CQDATE:6/13/2024PROJECT NO.227871.1640 Shattuck Road, Suite 110 Andover, MA 01810 Tel: 978.557.8150 Fax: 978.557.7948 PropertyApplication DateParcel ID Address Municipal/Private Facility Land Use Change in Impervious Area (+/- SF)Additional TP Load Generated (+/- lb/yr)1Email 6/7/25MunicipalRoadwayLDR8,5500.302Email 6/7/24MunicipalRoadwayLDR-1,500-0.0449/19/202331-1621 Richard RoadPrivateSingle FamilyMDR6810.0366/20/202325-9225 Munroe RoadPrivate Single FamilyMDR24320.1174/10/202310-15915 Waltham StreetPrivateGas StationCom/Ind25700.1192/9/202325-6525 Normandy RoadPrivateSingle FamilyMDR21130.10102/4/202333-23724 Wachusett DrivePrivate Single FamilyMDR61660.28111/18/202311-254 Old Shade StreetPrivate Single FamilyLDR15130.051212/2/202234-8890 Middle StreetPrivate Single FamilyMDR14770.071311/3/202224-814 Stedman RoadPrivate Single FamilyLDR13370.051410/26/202243-6F7 Elena RoadPrivate Single FamilyLDR17140.061510/24/20224-3226 Concord AvenuePrivate Single FamilyMDR20940.091610/24/20224-4222 Concord AvenuePrivate Single FamilyMDR-1129-0.051710/20/20224-5216 Concord AvenuePrivate Single FamilyMDR-1089-0.051810/3/20229-85A141 Pleasant StreetPrivate Single FamilyMDR7050.03206/15/20224-7206 Concord AvenuePrivate Single FamilyMDR-149-0.01214/28/202233-3040 Bridge StreetPrivate Single FamilyMDR3510.02224/28/202250-88A49 Grandview AvenuePrivate Single FamilyMDR13840.06234/21/202243-312 Barrymeade DrivePrivate Single FamilyLDR14220.05254/12/20222-1E13 Cart Path LanePrivateSingle FamilyLDR57350.20Sum2.28Lincoln St (near 357 Lincoln)2672 0.123097 0.14MDRMDR2/18/2022 23-12 65 Locust Avenue Private Single Family 4/20/2022 8-124 34 Philip Road Private Single Family 21 Crescent Road Private Single Family MDR 0.03 5 7/25/2023 50-110 20 Welch Road Private Single Family HDR 1491 0.083 10/12/2022 8-57MDR5823/5/2023 4-41 130 Concord Avenue Private Single Family 3064 0.1419 8/27/2022 23-7 5 Cedarwood Terrace Private Single FamilyMDR 5220 0.2382246 0.10Change in Phosphorus Load Calculations 2021 - June 2024242627Allen St at Stedman2/10/2022 42-86 2 Leroy Road Private Single Family MDR1 of 1 Attachment 2: Funding Documentation Funding Opportunities Summary Matrix Financial Capability Assessment Technical Memorandum Town of Lexington Phosphorus Control Funding OpportunitiesTown of Lexington, MA - Funding Opportunities for Phosphorus Control Funding ProgramAdministering AgencyType Current Status Future TimelineLexington Projects for ConsiderationPotential Next StepsFunding Available TotalFunding Available per applicantDescription Considerations WebsiteMassachusetts Clean Water State Revolving Fund Loan (SRF)MassDEP Division of Municipal Services (DMS)LoanProject Evaluation Forms (PEFs) due 7/26/2024.Open annually. - SCMs currently under design (Valleyfield 1, Green Lane, Philip Road, Bowman Elementary, Jonas Clarke)- Submit PEF if interested in funding a construction project in 2026. - SRF Application for Financial Assistance would then be due mid-October 2025. - Construction would need to start by 6/30/2026.$932M NAProvides a low-cost financing method to assist communities to comply with water-quality standards. The program emphasizes watershed management priorities, stormwater management, and green infrastructure.Funds construction of stormwater management projects and those that help comply with 2016 MS4 General Permit.- Current subsidy is provided via a 2% interest rate loan for 20 year; 2.4% for up to 30 year term.- 0% interest available, for nutrient management but focused on wastewater management projects. W&C has petitioned MassDEP to give Phosphorous Control projects the same consideration for 0% loans. Information from DEP pending. https://www.mass.gov/state-revolving-fund-srf-loan-programMA SRF Asset Management Plan GrantMassDEP Division of Municipal Services (DMS)GrantProject Evaluation Forms (PEFs) due 7/26/2024.Open annually. -invert data collection for pipes; private SCM inventory; SCM O&M plans; capacity assessments (flood risk assessment)- Submit PEF if interested in completing AMP in 2026. - SRF Application for Financial Assistance would then be due mid-October 2025. - AMP completed following grant award/contracting process.$8.6Mup to $150,000 in grant funding; 40% match requiredProgram provides grant funding for asset management planning for existing drinking water, wastewater, and /or stormwater infrastructure including the following eligible activities:- asset management program planning; software needs assessment, procurement, and implementation; - asset inventory- condition assessment - risk analysis- O&M program / lifecycle cost analysis- CIP- Funding Analysis- Asset management plan- Grants up to $150K with 40% local match resulting in a total project cost of $250,000 and a match of $100,000; Town does not need to apply for max grant amount. - Local Match can be up to 50% in-kind services, with balance as cash match.Asset Management Planning Grant Program | Mass.govMassachusetts Municipal Vulnerability Preparedness Grant (MVP)MassDEP GrantApplications were due April 26, 2024 Not solicited annually, but periodically.-Valleyfield Wetland Restoration and Water Quality Enhancement (submitted application 4/26)-await awards from application submitted, expected mid-July.Town applied for $358,200 in grant funding and would provide match of $39,800 for a total project cost of $398,000Funding to municipalities seeking to advance priority climate adaptation actions to address climate change impacts resulting from extreme weather, sea level rise, inland and coastal flooding, severe heat, and more. Eligible applicants are municipalities who have completed the Community Resilience Building process and received “MVP Community” designation by EEA. • Vulnerability and Risk Assessment• Local Bylaws, Ordinances, Plans, and other Management measures• Redesigns and Retrofits• Energy Resilience Strategies• Nature-Based Flood Protection, Drought Prevention, Water Quality, and Water Infiltration Techniques.• Ecological Restoration and Habitat Management to increase resiliencyA minimum 10% match of the total project cost is required.https://www.mass.gov/info-details/mvp-action-grantWater Management ActMassDEP GrantApplications were due electronically by 5:00 P.M. on October 17, 2023.Open annually. TBD TBD; 2025 funding round not announced yet-5-31-2024 $1Mapproximately $100K with 20% local match required.Leak detection, stormwater recharge, establish more flow for low flow basins. Withdrawal mitigation projects that address the following: improve or increase instream flow, wastewater projects that keep water local, stormwater management projects that improve recharge, reduce impervious cover and/or improve water qualityPublic water suppliers with a WMA permit or permit application under review, or public water suppliers with a WMA registration (including eligible municipalities) are eligible to submit proposals in response to this RFR for this grant program. Cooperative proposals are encouragedWater Management Act Grant Programs for Public Water Suppliers | Mass.govStormwater MS4 Municipal Assistance Grant ProgramMassDEP GrantApplications were due electronically by 5:00 P.M. on November 10, 2023.Open annually. Program prioritizes collaboration among communities, so monitor opportunities for regional partnerships / projects. -Track program if collaborative project/program is identified among Town and others.-Charles River Watershed Association (CRWA) applied and received two grants under this program. Town is involved (though not direct applicant). $300,000 UnknownThis program, introduced in 2017, enables groups of MA municipalities to expand efforts to meet requirements for the 2016 Small MS4 General Permit, and to reduce stormwater pollution through coordinated partnerships that emphasize resource sharing. Only projects that meet the specific requirements of the 2016 Small MS4 General Permit will be considered for funding. Examples of potentially eligible, MS4-focused projects include, but are not limited to:i. Assessment tool(s) for identifying retrofit sites;ii. Data intake and field-certification tool(s) for Best Management Practices (BMP operation and maintenance programs;iii. Formation of new regional MS4 coalitions in areas where none exist;iv. MS4 capital investments, including investments in equipment and electronic resources;v. Outreach and education services, materials, and/or strategies for (a) public engagement and/or (b) establishment of stormwater enterprise funds or stormwater utilities;vi. Survey research to identify the needs of smaller MS4 municipalities;vii. Asset management tools for tracking and maintaining stormwater infrastructure such as catch basins, culverts, and BMPs; and/orviii. MS4-related job training opportunities that benefit environmental justice populations.Eligible Entities are groups of two or more Massachusetts municipalities that aresubject to the 2016 Small MS4 General Permit; Regional Planning Agencies acting on behalf of two or more municipalities that are subject to the 2016 Small MS4 General Permit; Massachusetts stormwater coalitions representing two or more municipalities that are subject to the 2016 Small MS4 General Permit; and/or non-profit organizations acting on behalf of two or more municipalities that are subject to the 2016 Small MS4 General Permit.Applicants are not required to provide matching funds. However, Applicants are encouraged to identify other known sources of funding for a proposed project on the Application Form, from both secured and anticipated sources. https://www.mass.gov/info-details/grants-financial-assistance-watersheds-water-qualityFunding Opportunities to PrioritizeJune 2024 1 Town of Lexington Phosphorus Control Funding OpportunitiesFunding ProgramAdministering AgencyType Current Status Future TimelineLexington Projects for ConsiderationPotential Next StepsFunding Available TotalFunding Available per applicantDescription Considerations Website Restoration & Revitalization Priority Projects ProgramMassachusetts Division of Ecological RestorationGrantLast application deadline - May 17, 2021.Unknown; no current plans for future solicitationsN/AContinue to track program for future grant program announcements and updates. $10-70kProjects Program to restore and protect the Commonwealth’s rivers, wetlands, and watersheds for the benefit of people and the environment, specifically streamflow restoration and urban stream revitalization. Eligible applicants include restoration project site landowners, non-profit and/or non-governmental organizations, regional planning organizations, municipalities, and state and federal agencies. Priority Project focus updated per application period. Last call for applications focused on:• Cranberry bog wetland restoration.• Dam removal and river restoration.• Coastal wetland restoration projects.• A match is not required.https://www.mass.gov/how-to/become-a-der-priority-project#:~:text=Through%20the%20Priority%20Projects%20program,aquatic%20resources%2C%20and%20partner%20support.Section 604b Water Quality Management Planning Grant ProgramMassDEP GrantGrant Applications due May 8, 2024 at 5 PM.Open annually. None; these grants are for Basin Plans / watershed based plan.None $916kProgram to determine the nature, extent, and causes of water quality issues and to develop plans to restore or protect water quality pursuant to the CWA and Massachusetts Surface Water Quality Standards. Eligible grant applicants include: regional planning agencies, council of governments, counties, conservation districts, cities and towns, and federally or state recognized tribes. •The determination of the nature, extent, and causes of water quality problems and determination of pollutant load reductions necessary to meet the SWQS.• Identification of sources of impairment(s) to impaired waters identified in the Final 2022 Massachusetts Integrated List of Waters.• Development of climate-resilient implementation plans to remediate pollution to impaired waters that will partially or fully restore waterbody segments not meeting the SWQS.• Providing opportunities for communities with EJ populations to ensure equitable and fair access to the benefits of the 604(b) Grant Program.• Support of projects that will be used for future Section 319 projects, such as developing WBPs, implementation plans, and pollutant load reduction calculations.• Ten percent (10%) retainage is withheld from each invoice submitted during the project.• MassDEP pays the retainage to the Grantee once all deliverables are received, and the contract is closed out.• Each Applicant must provide a signed EEO/AA Policy Statement on the organization'sletterhead, which outlines its company's/agency's commitment to EEO/AA as a company/agency objective of equal importance to other company/agency objectives. •Matching funds are not required for a project to be eligible for funding.https://www.mass.gov/info-details/grants-financial-assistance-watersheds-water-quality#section-604(b)-water-quality-management-planning-grant-program-Coastal Habitat and Water Quality GrantsMassachusetts Office of Coastal Zone Management (CZM)GrantCZM anticipates the release of FY 2025 Request for Responses (RFR) this spring.Open annually. None None, but continue to track program if warranted. $2.1M awarded in 2023.Provides financial resources for projects that assess and treat stormwater impacts and support comprehensive habitat restoration planning and implementation activities. Municipalities within the MA coastal watershed are eligible to apply for activities such as:• Efforts to assess, identify, and characterize NPS pollution impacts from stormwater runoff to coastal waterbodies.• Design and construction of stormwater structural BMPs.• Capacity building activities- including trainings for municipal staff, bylaw development, and case studies- that support future implementation of green stormwater infrastructure.• Development of habitat restoration plans, including data collection and synthesis, natural resource assessments, and restoration prioritization leading to the development of a comprehensive plan.• Advancement of priority land acquisition planning activities for the purposes of restoration, buffer protection, and/or future marsh migration.• 40% non-federal match required in 2023• Information/application details expected to roll-out spring 2024. Keep tabs on April 10th information session.https://www.mass.gov/info-details/coastal-habitat-and-water-quality-grantsSection 319 Nonpoint Source Competitive Grants Program MassDEP GrantThe FFY2023-2024 Section 319 Request for Proposals release date is Friday, March 15, 2024.Grant Application Deadline: Friday, May 24, 2024 at 5 PM.Open annually. None; this program cannot fund MS4 permit compliance. None (note that Mystic River Watershed Association applied in partnership with Town recently and is awaiting awards).NA NASection 319 of the CWA provides grants for implementation projects that address the prevention, control, and abatement of nonpoint source (NPS) pollution such as: • The protection of high quality and unimpaired waters. These Healthy Watersheds projects are allowed under EPA §319 program guidelines. • Projects that implement climate adaptation and pollutant removal Best Management Practices (BMPs), and the application of new NPS management technologies,• Projects that address equity, diversity and Environmental Justice, and• Projects that build upon previous §319-funded work and/or work that has been initiated by programs such as the CWA §604(b) Water Quality Management Planning Program, the Municipal Vulnerability Preparedness (MVP) Program, or the Coastal Pollutant Remediation (CPR) Grant Program.• 40% non-federal match required in 2023.• 319 grant projects must include a public information and education component to enhance public understanding of the project and its water quality benefits. https://www.mass.gov/info-details/grants-financial-assistance-watersheds-water-quality#:~:text=Section%20319%20Nonpoint%20Source%20Competitive%20Grants%20Program,-Section%20319%20of&text=implement%20measures%20that%20address%20the,evaluating%20the%20project%20results%3B%20andFunding Opportunities to Continue to TrackJune 2024 2 Town of Lexington Phosphorus Control Funding OpportunitiesFunding ProgramAdministering AgencyType Current Status Future TimelineLexington Projects for ConsiderationPotential Next StepsFunding Available TotalFunding Available per applicantDescription Considerations WebsiteSection 219: Environmental Infrastructure Army Corp of EngineersGrantContact Army Corp of Engineers for specific project opportunity.UnknownContact Army Corp of Engineers for specific project opportunity.Contact: Dave Wethingtondavid.m.wethington@usasce.army.mil202-761-1878Army Corp spent $81M on Section 219 projects from FY2013-2017The Army Corps of Engineers builds water-related environmental infrastructure—such as wastewater treatment plants—for cities, counties, and regions. These infrastructure projects are known as "Section 219" projects after their authorizing law. The Section 219 program provides planning, design, and construction assistance for water- and sewer-related environmental infrastructure and resource protection and development projects for local communities throughout the country. There is currently no documented criteria from the Army Corp that ranks projects for funding. The Corps must have an authorization from Congress to begin a project or study. To get a project or study authorized, applicants must submit a request for assistance to the upcoming Water Resource Development Act. https://efcnetwork.org/wp-content/uploads/2019/07/MA-Water-Wastewater-Funds-2019.pdfLive Oak Bank: Water and Environmental ProgramsLive Oak Bank LoanContact program specialist to apply.UnknownContact the program specialist to apply.Matt Peeler; matt.peeler@liveoak.bank; 910-790-5867Unknown UnknownProvides up to 40-year fixed rate financing for water, waste and stormwater for rural and unincorporated communities enable communities to get projects started faster and help make them affordable.https://www.liveoakbank.com/business-loans/usda-loans/June 2024 3 Town of Lexington, MA (Project #0227871.16) 1 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 TECHNICAL MEMORANDUM TO:Carolyn Kosnoff, John Livsey (Town of Lexington, MA) CC:Scott Salvucci, Zach Henderson, James Sherrard Jr., Lindsey Wilcox (Woodard & Curran) PREPARED BY:Ethan Wilson (Woodard & Curran) REVIEWED BY:Thomas Bryant, James Aiken (Woodard & Curran) DATE:June 28, 2024 RE:Financial Capability Assessment for MS4 Permit Stormwater Phosphorus Controls Table of Contents: 1.Introduction 2.Data Sources and Assumptions 3.Financial Capability Assessment Alternative 1 a. Scenario 1 – Wastewater and Stormwater Costs b. Scenario 2 – Water, Wastewater, and Stormwater Costs 4.Financial Capability Assessment Alternative 2 5.FCA Financial Alternatives Checklist 6.Recommended Next Steps Attachment A - Lexington Stormwater Enterprise Fund Feasibility Report excerpt and cost allocations Attachment B – Operating Costs Attachment C - Five-Year Capital Improvement Plan Attachment D - Revenue Requirements for Water, Wastewater, and Stormwater Attachment E - Affordability Projection Attachment F - Financial Alternative Analysis Checklist Town of Lexington, MA (Project #0227871.16) 2 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 1. Introduction Woodard & Curran has completed a Financial Capability Assessment (FCA) following EPA’s 2024 Clean Water Act (CWA) Financial Capability Assessment Guidance consistent with the MS4 General Permit Compliance Phosphorus Control Plan (PCP) Support contract dated December 23, 2023. If the Town of Lexington (Town) determines an Alternative Schedule Request should be submitted to EPA for MS4 compliance, this assessment is a requirement to support schedule negotiations. The FCA also provides key information for the Town to evaluate affordability and impacts to rate payers/taxpayers of the costs to comply with the MS4 General Permit and PCP implementation requirements. This Technical Memorandum (TM) reviews the process and results under the three components of the FCA. Alternative 1 considers standardized metrics to measure the financial impact of CWA controls, including both stormwater and wastewater. These include a residential indicator to assess household costs; financial capability indicators (socioeconomic, debt, and financial); and the lowest quintile poverty indicator (LQPI). Alternative 2 considers more detailed financial and rate models to evaluate impacts to residents’ bills over time and to assess various implementation schedules. EPA’s guidance also recommends the LQPI to be considered under Alternative 2. The final component of the FCA is a financial alternatives assessment which allows for additional qualitative information to be provided in consideration of alternatives to reduce cost and limit impacts to the lowest-income households. The financial alternatives assessment will support the FCA under both Alternative 1 and 2. 2. Data Sources and Assumptions Stormwater Costs: Existing stormwater operating expenditures were estimated by utilizing the Lexington Stormwater Enterprise Fund Feasibility Report (Tighe & Bond, 2018) outlining historic stormwater program expenses. This report provided expenses of stormwater related activities from the Highway and Engineering Division budgets from FY2014 to FY2018. These included Highway and Engineering Staff and Contractual Services, operating expenses for catch basins, culverts, stormwater pipelines, stormwater control measures (SCMs), and street sweeping. The costs provided in the Tighe & Bond report were evaluated against line items in the full operating budget totals to calculate the percentages allocated to stormwater. The average percentage allocation was then applied to current budgets to provide an updated approximation of current stormwater program costs. This allocation and excerpts from the Tighe & Bond report are provided in Attachment A. Additional stormwater program costs include the estimated Phase 1 PCP Implementation operations & maintenance (O&M) and capital cost estimates provided from the PY5 Phase 1 PCP Report. These costs include Non-Structural and Municipal SCM O&M and Structural SCM capital costs. Additional capital costs provided by the Town for the stormwater program are also included. Residential Share of Costs: A component to calculate the residential indicator under Alternative 1 includes a factor to apply total current and projected costs to residential customers. EPA’s CWA guidance uses the percentage of residential wastewater flows to total wastewater flows as this factor. Given that this TM focuses on stormwater, EPA’s approach was modified for use in Alternative 1. The Town provided a 2021 stormwater fee model which included data on all parcels within the Town. This parcel data was analyzed to calculate the percentage of Impervious Area (IA) square feet (sq. ft.) attributable to Single Family Residential (SFR) properties to IA sq. ft. townwide. Approximately 59.5% of total IA sq. ft. is attributed to SFR, and this Town of Lexington, MA (Project #0227871.16) 3 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 factor was used in residential indicator calculations. One limitation of this assumption is that the SFR does not include any multi-family or condominium properties, which may under-allocate costs to residential customers. Water & Sewer Costs: Water and sewer costs reference FY2025 budget documents and 5-year Capital Improvement Plan (CIP) documents provided by the Town. Projected future costs include standard cost escalations where appropriate. 3. Financial Capability Assessment Alternative 1 The FCA guidance is focused on CWA impacts alone (stormwater and wastewater) and does not specifically allow for total water costs (drinking water, wastewater, and stormwater) to be considered under Alternative 1. Because of this, two scenarios are presented in this section for Alternative 1. The first scenario accounts for CWA costs, wastewater, and stormwater. The second scenario accounts for total water costs to show how results change when drinking water, wastewater, and stormwater are included. Additionally, the end of this section includes a summary of how the results of Alternative 1 change when anticipated debt is included. 3.1.The Residential Indicator – Scenario 1 (Stormwater and Wastewater Costs Only) The Residential Indicator metric assesses the cost per household (CPH) as a percentage of the Town’s Median Household Income (MHI) to meet CWA regulatory requirements (under this scenario, for wastewater and stormwater costs only). This first involves identification of the current and proposed program costs per household. The cost per household and MHI are then used to calculate the Residential Indicator. The outcome is then evaluated against EPA’s benchmarks to determine if the CWA requirements produce a high, mid-range, or low financial impact to the Town’s residents. EPA’s FCA guidance is focused on CWA controls as it relates to wastewater and examples utilize wastewater costs and flow data. Given that stormwater management also falls under the CWA jurisdiction, the FCA guidance was adapted for this Task. This scenario considers the CWA costs associated with both wastewater and stormwater programs. To calculate the cost per household, current annual O&M expenses (excluding depreciation) and annual debt service costs are added. Projected costs for annual O&M expenses and debt service for CWA compliance are also added. The sum of current and projected costs is added and multiplied by the share of SFR IA sq. ft. to total IA sq. ft. (in lieu of using the residential share of total wastewater flow). The outcome of this calculation is then divided by the total occupied housing units from the most recent Census 5-Year American Community Survey data to determine the Town’s cost per household. Lastly, the cost per household is divided by MHI to calculate the Residential Indicator. The table below provides EPA’s financial impact ranges to determine where the Town scores. TABLE 1: RESIDENTIAL INDICATOR SCORE RANGES Residential Indicator Financial Impact Residential Indicator (CPH as % of MHI) Low Less than 1.0 Percent of MHI Mid-Range 1.0 to 2.0 Percent of MHI Town of Lexington, MA (Project #0227871.16) 4 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 Residential Indicator Financial Impact Residential Indicator (CPH as % of MHI) High Greater than 2.0 Percent of MHI Existing stormwater and wastewater program costs for FY2025 were used to develop the residential indicator cost per household using estimates previously discussed. Existing stormwater operating costs are estimated to be $1,151,234 in addition to indirect costs of $470,901 for the FY2025 cycle. $1,350,000 in cash funded capital for stormwater management in FY2025 was added to the existing cost projection. Additionally, $183,110 in FY2025 debt service was added to account for stormwater related activities. This debt is repaid with general fund revenues but is included here to recognize full costs. All existing stormwater program costs total $3,155,245 which include operating expenses (labor, contractual services, catch basins, culverts, stormwater pipelines, SCMs, and street sweeping), indirect costs, existing debt service, and cash funded capital. Existing wastewater operating costs are estimated to be $13,475,733 for the FY2025 cycle. This amount includes $1,592,858 of debt service and $596,525 of indirect costs. $550,000 in cash funded capital for wastewater projects in FY2025 was added to the existing cost projection. All existing wastewater costs mentioned total $14,025,733. Total existing stormwater and wastewater program costs are $17,180,978 for FY2025. Future projected costs are comprised of five main components as detailed in Table 2: •Stormwater program Phase 1 PCP structural SCM capital project costs •Stormwater management program capital costs provided in the Town’s 5-Year CIP •Stormwater program PCP O&M costs for Non-Structural SCM and Municipal SCM O&M Costs •Wastewater capital project costs o pump station upgrades o sanitary sewer investigation and improvements To be conservative, the Phase 1 PCP assumed capital and O&M costs for new SCMs would be incurred over a five-year period beginning in FY2024 to meet the targeted reduction by the end of Phase 1 on June 30, 2028 (FY2028). However, the Town did not include funding for Phase 1 PCP costs in the FY2024 and FY2025 budgets. Instead, the costs will be incurred in FY2026 through FY2028 which is what is assumed for the FCA. The five-year PCP Phase 1 capital cost estimate totals $6,715,000. The Town typically cash finances their current capital plan but has indicated that debt financing could be used for significant investments not included in the current CIP. For this reason, it is assumed that the Phase 1 PCP capital costs will be debt financed for a 10-year period. A summary of the total projected wastewater and stormwater program costs are provided in the table below. TABLE 2: PROJECTED FUTURE STORMWATER AND WASTEWATER COSTS Projected Costs FY2026 FY2027 FY2028 Total Stormwater: Phase 1 PCP Capital $2,238,333 $2,238,333 $2,238,333 $6,715,000 Stormwater Management Program $2,642,500 $2,655,000 $2,332,500 $7,630,000 Town of Lexington, MA (Project #0227871.16) 5 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 Projected Costs FY2026 FY2027 FY2028 Total Phase 1 PCP O&M Costs $1,221,250 $1,221,250 $1,221,250 $3,663,750 Wastewater: Pump Station Upgrades $100,000 $100,000 Sanitary Sewer System Investigations and Improvements $1,082,431 $1,104,080 $1,126,161 $3,312,672 Total $7,184,514 $7,318,663 $6,918,244 $21,421,421 The projected wastewater and stormwater program costs total $21,421,421 for FY2026 to FY2028. Total projected costs equal $5,689,905 annually. This assumes Phase 1 PCP capital costs are financed at 3% for a 10-year term, all other capital costs are cash financed over three years, and additional annual O&M costs. The total current and projected costs equal $22,870,883 for wastewater and stormwater programs. The total current and projected stormwater and wastewater costs are then multiplied by a residential percentage factor to ultimately determine the residential share of total and current projected costs. Utilizing the 59.5% allocation of SFR IA sq. ft., the residential share of total current and projected costs is $13,610,463. The Town has a total of 12,385 households (per the latest 5-year Census American Community Survey estimates) equating to a cost per household of $1,099. Annual Cost per Household as a Percentage of MHI: The Town’s MHI was retrieved from the Census Bureau’s most recent 5-year American Community Survey (ACS) Estimates (2022). The Town’s MHI for this period was $206,323 which equates to an annual cost per household as a percent of MHI of 0.53%. Per EPA’s score benchmarks for the residential shown in the following table, the Town scores Low-Impact on the residential indicator under Alternative 1 Scenario 1 (Wastewater and Stormwater Costs Only). TABLE 3: RESIDENTIAL INDICATOR FCA Benchmark Score Cost per Household as % of MHI Low Less than 1.0% of MHI Mid-Range 1.0% to 2.0% of MHI High Greater than 2% of MHI 3.2.Financial Capability Indicators The indicators under this category – debt indicators, socioeconomic indicators, and financial management indictors – evaluate the financial capability of the Town to support CWA regulatory requirements. This includes examination of the Town’s overall debt burden, socioeconomic conditions, and financial operations. Debt indicators assess the current debt burden and ability to issue additional debt to finance CWA controls to comply with regulations. This includes assessment of the Town’s Bond ratings and overall net debt as a percentage of full market property value. The socioeconomic indicators are intended to assess the overall economic conditions of residents through review of the unemployment rate and median household income of the Town. The final category, financial management indicators, seeks to evaluate the Town’s general Town of Lexington, MA (Project #0227871.16) 6 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 ability to effectively manage financial operations. To evaluate this category, the property tax collection rate and property tax revenues as a percent of full market property value is calculated. 3.2.1. Debt Indicators Bond Rating: The following provides EPA’s score benchmarks for a community’s bond rating. The town maintains an Aaa rating from Moody’s Investor Services, the highest rating available. The Town scores Strong on EPA’s bond rating indicator. TABLE 4: MOODY’S INVESTOR SERVICES RATING FCA Benchmark Score Moody’s Rating Weak Ba, B, Caa, Ca, C Mid-Range Baa Strong Aaa, AA, A Overall Net Debt as a Percent of Full Market Property Value: The following table provides EPA’s score benchmarks for this indicator. This indicator measures the debt burden on residents and ability of the Town to issue additional debt. The indicator considers total net debt Townwide that is not repaid with any dedicated revenue source. The Town currently has $187,226,311 in total net debt, excluding water & sewer enterprise debt that is directly repaid by those enterprise fund revenues. The Town’s full market value of real property is $15,410,305,569, based on FY2023 data. The Town has net debt of approximately 1.2% of full market property value. Therefore, the Town scores Strong on this indicator. TABLE 5: NET DEBT AS A PERCENTAGE OF PROPERTY VALUE FCA Benchmark Score Percent of Property Value Weak Above 5% Mid-Range 2-5% Strong Below 2% 3.2.2. Socioeconomic Indicators Unemployment Rate: The following table provides EPA’s score benchmarks for this indicator. National and Town unemployment rates were retrieved from the Bureau of Labor Statistics for the most recent calendar year (2023). The series selected was “Unemployment Rate Not Seasonally Adjusted, Across All Industries, All Occupations, 16 Years and Over, All Origins, All Races, Both Sexes, and All Education Levels.” The National Unemployment Rate for 2023 was 3.6% and the Town of Lexington’s Unemployment Rate was 2.8%, 0.8% lower than the National Rate. Given the Town is ± 1 percentage point of the National Average, the Town scores Mid-Range on this indicator. Town of Lexington, MA (Project #0227871.16) 7 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 TABLE 6: UNEMPLOYMENT RATE OF COMMUNITY COMPARED TO NATIONAL FCA Benchmark Score Unemployment Rate Weak More than 1 percentage point above the National Average Mid-Range ± 1 percentage point of the National Average Strong More than 1 percentage point below the National Average Median Household Income: The following table provides EPA’s score benchmarks for this indicator. National and Town MHI figures were retrieved from the Census Bureau’s most recent 5-year American Community Survey (ACS) Estimates (2022). The table selected was “Median Household Income in the Past 12 Months (in 2022 Inflation-Adjusted Dollars).” The National MHI for 2022 was $75,149 and the Town of Lexington MHI was $206,323. Given the Town’s MHI is approximately 175% higher than the National Average, the Town scores Strong on this indicator. TABLE 7: MEDIAN HOUSEHOLD INCOME (MHI) OF COMMUNITY COMPARED TO NATIONAL FCA Benchmark Score Median Household Income Weak More than 25% below National MHI Mid-Range ± 25% of the National MHI Strong More than 25% above National Average 3.2.3. Financial Management Indicators Property Tax Revenues as a Percent of Full Market Property Value: The following table provides EPA’s score benchmarks for this indicator. The full market value of real property and total property tax revenue utilize FY2023 data to match assessed values with actual revenues. In FY2023, the Town’s total assessed valuation was $15,410,305,569, excluding the assessed value of personal property. As Massachusetts law requires assessors to value all real and personal property on a fair cash basis annually, the assessed valuation reflects the full market value of real property. Total property tax revenues for FY2023 were $221,302,276, reflecting approximately 1.4% of full market property value. The Town scores Strong for this indicator. TABLE 8: PROPERTY TAX REVENUES AS A % OF PROPERTY VALUE FCA Benchmark Score Percent of Property Value Weak Above 4% Mid-Range 2-4% Strong Below 2% Property Tax Revenue Collection Rate: The following table provides EPA’s score benchmarks for this indicator. Property taxes levied (excluding personal property) were $222,782,463 in FY2023. Based on the Town of Lexington, MA (Project #0227871.16) 8 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 property tax revenue collected of $221,302,276 as referenced above, the Town has a property tax collection rate of 99.3% for FY2023. The Town scores Strong for this indicator. TABLE 9: PROPERTY TAX REVENUE COLLECTION RATE FCA Benchmark Score Tax Revenue Collection Rate Weak Below 94% Mid-Range 94-98% Strong Above 98% Property taxes levied (excluding personal property) were $222,782,463 in FY2023. Based on the property tax revenue collected of $221,302,276 as referenced above, the Town has a property tax collection rate of 99.3% for FY2023. The Town scores Strong for this indicator. 3.2.4. Financial Capability Indicators Summary Each of the six indicators presented in the previous sections received a score. These six scores are summarized to create a single Financial Capability Indicator Score. The benchmark scores of weak, mid- range, and strong reflect a numerical score of 1, 2, and 3, respectively. The average of all six numerical scores reflects the overall indicators score with an average score below 1.5 considered weak, a score between 1.5 and 2.5 considered mid-range, and a score above 2.5 considered strong. The following table provides a summary of the Town’s Financial Capability Indicators Score. Given that the Town scored Strong on all indicators except for the unemployment rate indicator, the Town has a Strong overall score of 2.8. TABLE 10: SUMMARY OF LEXINGTON’S FINANCIAL CAPABILITY INDICATORS Indicator Actual Value Benchmark Score Bond Rating Aaa Strong 3.0 Overall Net Debt as a Percent of Full Market Property Value 1.2%Strong 3.0 Unemployment Rate 2.8%Mid-Range 2.0 Median Household Income $206,323 Strong 3.0 Property Tax Revenues as a Percent of Full Market Property Value 1.4%Strong 3.0 Property Tax Revenue Collection Rate 99.3%Strong 3.0 Town Indicators Score 2.8 Financial Capability Indicator Benchmarks Strong Given that the Town scored Strong on all indicators except for the unemployment rate indicator, the Town has a Strong overall score of 2.8. Town of Lexington, MA (Project #0227871.16) 9 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 3.3.Financial Capability Matrix The financial capability matrix combines the results of the residential indicator score and the financial capability indicators score to create a summary score. The following table illustrates how these indicators are reviewed. Following this matrix guidance, under Alternative 1 Scenario 1 the Town shows that implementing the required CWA wastewater and stormwater programs has a Low Impact. This is due to the Strong Financial Capability Indicators Score and a Residential Indicator score that has a Low Impact. TABLE 11: FINANCIAL CAPABILITY MATRIX SCORE Residential Indicator ScoreFinancial Capability Indicators Score Low Impact (Below 1%) Mid-Range (1% to 2%) High Impact (Above 2%) Strong (Above 2.5)Low Impact Low Impact Medium Impact Mid-Range (1.5 to 2.5)Low Impact Medium Impact High Impact Weak (Below 1.5)Medium Impact High Impact High Impact 3.4.Lowest Quintile Poverty Indicator Score The lowest quintile poverty indicator (LQPI) considers six Census data points to assess the severity and prevalence of poverty within a given community. The following table provides each indicator, their weighting, and the comparison of National values to the Town of Lexington. Given that the Town generally has low poverty characteristics and high income, the Lowest Quintile Poverty Indicator has a score of 3 equating to a Low Impact. TABLE 12: LOWEST QUINTILE POVERTY INDICATOR SCORE Indicator Strong (Score =3) Mid- Range (Score=2) Weak (Score = 1)Weight National Value Town Value Town Compared to National Score LQPI #1: Upper Limit of Lowest Quintile Income More than 25% above national ± 25% of national More than 25% below national 50%30,785 89,167 189.6%3 LQPI #2: Percentage of Population with Income Below 200% of Federal Poverty Level More than 25% below national value ± 25% of national value More than 25% above national value 10%28.8%7.2%-75.1%3 LQPI #3: Percentage of Households Receiving Food Stamps/SNAP Benefits More than 25% below national value ± 25% of national value More than 25% above national value 10%11.5%3.0%-74.2%3 Town of Lexington, MA (Project #0227871.16) 10 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 Indicator Strong (Score =3) Mid- Range (Score=2) Weak (Score = 1)Weight National Value Town Value Town Compared to National Score LQPI #4: Percentage of Vacant Housing Units More than 25% below national value ± 25% of national value More than 25% above national value 10%10.8%2.7%-75.1%3 LQPI #5: Trend in Household Growth >1%0%-1%<0%10%N/A 1.0%N/A 3 LQPI #6: Percentage of Unemployed Population 16 and Over in Civilian Labor Force More than 25% below national value ± 25% of national value More than 25% above national value 10%3.4%2.4%-29.4%3 Lowest Quintile Poverty Score 3 Lowest Quintile Poverty Indicator Benchmarks Low Impact (Above 2.5) Medium Impact (1.5 to 2.5) High Impact (Below 1.5) Low Impact 3.5.Expanded Financial Capability Assessment Matrix The expanded financial capability assessment matrix combines the result of the FCA score (the residential and financial capability scores discussed in section 3.3) with the LQPI. The following table illustrates how these indicators are reviewed. TABLE 13: EXPANDED FINANCIAL CAPABILITY ASSESSMENT MATRIX Lowest Quintile Poverty Indicator ScoreFCA Score (RI and FCI)Low Impact (>2.5) Mid-Range (1.5 to 2.5) High Impact (<1.5) Low Impact Low Impact Low Impact Medium Impact Medium Impact Low Impact Medium Impact High Impact High Impact Medium Impact High Impact High Impact Given the Town’s Low Impact scores for the Financial Capability Matrix and LQPI, the Town shows a Low Impact on the expanded financial capability assessment matrix. The EPA uses this score as one way to help determine where a community falls on their recommended implementation schedule benchmarks. With a Low Impact, the benchmark states that there should be a normal engineering/construction schedule. The benchmark for a Medium Impact has a total schedule generally up to 10 to 15 years and 15 to 20 years for a High Impact. Given the results of the LQPI cannot be modified, the Town would need to have significantly different results on the Residential Indicator and Financial Capability Indicators to move to a Medium Impact under the FCA Alternative 1 Scenario 1. The Residential Indicator would have to have a High Impact with a Town of Lexington, MA (Project #0227871.16) 11 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 Mid-Range Financial Capability Score or a Weak Financial Capability Score with a Mid-Range Residential Indicator. 3.6.Residential Indicator – Scenario 2 (Drinking Water, Wastewater, Stormwater) Alternative 1 Scenario 2 considers how the results of Alternative 1 Scenario 1 change when the total cost of water is included. If the cost of drinking water, wastewater, and stormwater are included, the Residential Indicator does in fact change. With the addition of the FY2025 water operating budget of $14,220,417, and FY2025 water capital projects of $2,288,900, total current costs are $33,690,295. Additionally, adding the planned water capital projects for FY2026 to FY2028 (to align with the Phase 1 PCP timeline) of $11,205,017 results in total estimated capital costs of $28,962,689. As presented in Scenario 1, the Phase 1 PCP capital costs are debt financed at 3% for a 10-year period and all other current capital costs are cash financed. With the estimated annual O&M costs associated with the stormwater Phase 1 PCP included, total projected costs are $9,424,349. When considering drinking water, wastewater, and stormwater, the total current and projected costs increase from $22,870,883 to $43,114,644. Following the same process described in Section 3.1, the residential share of total current and projected costs is $25,657,525 (attributing 59.5% of costs to residential users). This equates to a cost per household of $2,072 and cost per household as a percent of MHI of 1.00%. This moves the Residential Indicator from Low under Alternative 1 Scenario 1 to Mid-Range under Scenario 2. TABLE 14: RESIDENTIAL INDICATOR – SCENARIO 2 (DRINKING WATER, WASTEWATER, STORMWATER) FCA Benchmark Score Cost per Household as % of MHI Low Less than 1.0% of MHI Mid-Range 1.0% to 2.0% of MHI High Greater than 2% of MHI While the Residential Indicator changed to Mid-Range when considering total water costs, the Town would still have a Low Impact on the Financial Capability Matrix provided below as there was no change to the financial capability indicators. TABLE 15: FINANCIAL CAPABILITY MATRIX – SCENARIO 2 (DRINKING WATER, WASTEWATER, STORMWATER) Residential Indicator ScoreFinancial Capability Indicators Score Low Impact (Below 1%) Mid-Range (1% to 2%) High Impact (Above 2%) Strong (Above 2.5)Low Impact Low Impact Medium Impact Mid-Range (1.5 to 2.5)Low Impact Medium Impact High Impact Weak (Below 1.5)Medium Impact High Impact High Impact Town of Lexington, MA (Project #0227871.16) 12 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 3.7.Impacts to Alternative 1 with Additional Information While the results of Scenarios 1 and 2 under Alternative 1 to fund CWA or total water costs show the Town has adequate financial capability, it does not consider several important items. One item is the Town’s planned construction of a new High School and associated change to the overall debt burden. The school has an estimated cost of $600 million to $650 million1. The Town is partnering with the Massachusetts School Building Authority (MSBA) which is expected to contribute approximately $100 million in grant funding. The Town expects to debt finance approximately $500 million for the school, more than doubling the Town’s current debt burden. Additionally, the Town has a substantial amount of long-term debt authorizations that have not been issued, totaling $76,195,688 per FY2022 Audited Financial Statements. This results in a future total debt burden of $763,421,999, if accounting for $500 million for the school, all unissued debt authorizations, and the existing direct net debt discussed in section 3.2.1. If this is considered, the Overall Net Debt as a Percent of Full Market Value will be 4.95% (rounded to 5%), moving that indicator from Strong to Mid-Range. While significant, the Financial Capability Indicator benchmark remains Strong as presented in the table below. Overall net debt as a percent of full market value would need to be above 5% to change the Financial Capability Indicator benchmark from Strong to Mid-Range. TABLE 16: SUMMARY OF LEXINGTON’S FINANCIAL CAPABILITY INDICATORS – FUTURE DEBT CONSIDERED Indicator Actual Value Benchmark Score Bond Rating Aaa Strong 3.0 Overall Net Debt as a Percent of Full Market Property Value 5.0%Mid-Range 2.0 Unemployment Rate 2.8%Mid-Range 2.0 Median Household Income $206,323 Strong 3.0 Property Tax Revenues as a Percent of Full Market Property Value 1.4%Strong 3.0 Property Tax Revenue Collection Rate 99.3%Strong 3.0 Town Indicators Score 2.7 Financial Capability Indicator Benchmarks Strong When future debt is combined with the Residential Indicator Score presented in Scenario 2, the results of the Financial Capability Matrix remains a Low Impact. 1 As presented in the Lexington High School Preliminary Design Program, Project Finances — A New Vision for Lexington High School (lexingtonma.org) Town of Lexington, MA (Project #0227871.16) 13 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 TABLE 17: FINANCIAL CAPABILITY MATRIX – SCENARIO 2 (DRINKING WATER, WASTEWATER, STORMWATER) AND FUTURE DEBT CONSIDERED Residential Indicator ScoreFinancial Capability Indicators Score Low Impact (Below 1%) Mid-Range (1% to 2%) High Impact (Above 2%) Strong (Above 2.5)Low Impact Low Impact Medium Impact Mid-Range (1.5 to 2.5)Low Impact Medium Impact High Impact Weak (Below 1.5)Medium Impact High Impact High Impact The overall outcome of the Expanded Financial Capability Matrix would remain a Low Impact, due to the LQPI Score and a Low Impact on the Financial Capability Matrix. TABLE 18: EXPANDED FINANCIAL CAPABILITY MATRIX – SCENARIO 2 (DRINKING WATER, WASTEWATER, STORMWATER) AND FUTURE DEBT CONSIDERED Lowest Quintile Poverty Indicator ScoreFCA Score (RI and FCI)Low Impact (>2.5) Mid-Range (1.5 to 2.5) High Impact (<1.5) Low Impact Low Impact Low Impact Medium Impact Medium Impact Low Impact Medium Impact High Impact High Impact Medium Impact High Impact High Impact While inclusion of additional information does not change the result under Alternative 1, the impacts on residents and the Town’s overall debt burden are significant. Should the Town move forward with an alternative schedule request, the Town should include these factors in negotiations with the EPA. 4. Financial Capability Assessment Alternative 2 Alternative 2 of the FCA employs financial and rate model analyses to show year by year impacts of meeting CWA regulatory requirements. This allows the Town to submit more detailed information to assist in developing a reasonable schedule for implementing CWA control measures. EPA has not recommended benchmark percentages of household income for Alternative 2 but intends to keep the percentage of household income spent within reasonable bounds when establishing compliance schedules. Alternative 2 also allows for drinking water, wastewater, and stormwater costs to be included in financial models when costs are substantial. Given the Town’s drinking water and wastewater costs are substantial, they are included in the financial model prepared under Alternative 2. 4.1.Operating & Maintenance Costs Existing stormwater program O&M costs were estimated with available information as previously discussed in Section 2 and Section 3.1. FY2025 budget documents were used to project existing water and sewer expenditures. These include FY2023 actuals, FY2024 estimates, and the projected FY2025 budget. The water enterprise is projected to have a total operating budget of $15,220,417 for FY2025. The operating budget for the sewer enterprise is projected to total $13,975,732 for FY2025. The estimated stormwater operating and maintenance budget totals $1,622,135 for FY2025. The Town’s operating costs for all three utilities total Town of Lexington, MA (Project #0227871.16) 14 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 $30,818,284. All operating expenditures are escalated annually by a rate of 2% in years following FY2025. A complete breakdown of operating costs is provided in Attachment B. 4.2.Capital Improvement Plans A five-year Capital Improvement Plan was provided by the Town and included in Attachment C. The stormwater capital investments include a general stormwater management program (as indicated by the Town) in addition to capital costs associated with PCP Phase 1 planned structural SCM implementation, identified in the PY5 Phase 1 PCP report. As described in a previous section, the PCP planned structural capital costs were originally to be incurred over 5 years beginning in FY2024. However, as these costs were not incurred or budgeted for FY2024 and FY2025, the five-year total is assumed to be incurred over 3 years beginning in FY2026. The water and sewer capital investments include several projects, totaling $21,644,050 from FY2025 to FY2029. All capital costs are escalated annually by a factor of 2%. The chart below provides a summary of the annual debt service and cash-funded capital for all three utilities. Note that only one sewer project in FY2025 is assumed to be debt financed due to the Town’s shift to fund all current water and sewer capital projects with cash financing. All water, sewer, and stormwater capital projects are assumed to be cash financed for FY2026 and beyond except for the capital cost associated with Phase 1 PCP that is not included in the Town’s current CIP. FIGURE 1: TOTAL WATER CAPITAL AND DEBT SERVICE COSTS 4.3.Revenue Requirements The revenue requirement includes all operational and capital program costs. This reflects the total amount of revenue needed to be generated by user fees or other revenue sources and does not include any additional set aside for reserves/retained earnings. The revenue requirement for water, wastewater, and stormwater totals $35,225,176 in FY2025. The total revenue requirement reaches a peak of $44,683,512 in $0 $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 $14,000,000 FY2025 FY2026 FY2027 FY2028 FY2029 FY2030 Capital Expenditure Projected Debt Service Capital Improvements Debt Service and Capital Expenditures by Year Town of Lexington, MA (Project #0227871.16) 15 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 FY2027, primarily driven by the increased capital spend. Attachment D provides an overview of the revenue requirements for water, wastewater, and stormwater. 4.4.Overall Affordability Projection Overall affordability was reviewed by consideration of the total cost per household of drinking water, wastewater, and stormwater. Two Scenarios are provided to review the impacts of implementing Phase 1 PCP controls. The first is the baseline scenario, meeting the target load reduction under the Phase 1 PCP by completing planned capital projects by the end of FY2028. The second scenario provides an alternative timeline by spreading the planned capital costs to meet Phase 1 PCP reductions over 8 years through FY2033. The full affordability projection is provided in Attachment E and discussed below. The cost per household is calculated by taking the total revenue requirement divided by the Census figure of the Total Number of Occupied Housing Units. Assumptions in this forecast include housing units of 12,385, a 1% growth rate in MHI, and CIP only through FY2029. The baseline scenario shows that total water costs per household are significant (above 1% of MHI) in FY2024 and beyond. The cost per household reaches a peak of 1.7% of MHI in FY2027 as several capital projects are funded across the three systems. At this level, the cost per household approaches levels historically considered unaffordable by EPA (generally costs more than 2% of MHI). While this forecast shows a downward trend in costs per household after FY2027 it does not account for any capital projects needed beyond FY2029. Additionally, any costs associated with additional stormwater-based phosphorus load reductions under a Phase 2 PCP are not considered. The second scenario proposes an extended timeline to complete Phase 1 PCP projects through FY2033. The alternative scenario continues to show significant total water costs per household (above 1% of MHI) throughout the forecast period. Costs per household also peak in FY2027 at 1.6% of MHI. The second scenario does provide a slightly more stable increase in costs per household over the baseline scenario. Either scenario shows a relatively significant cost of total water per household. Additionally, the cost per household is unlikely to decrease given continued increases in operating expenses and required infrastructure capital investments. One way to help mitigate the costs per household is to leverage grant and loan funding for capital projects through programs like the State Revolving Fund (SRF). Programs typically offer subsidized interest rates on long term debt which can be used to spread the cost of infrastructure investment over the assets useful life and more equitably pass costs to the Town’s current and future residents. 5. FCA Financial Alternatives Checklist The financial alternatives checklist allows for the Town to provide additional information by providing answers to qualitative questions related to financing options, rate design, support for low-income residents, and utility management. EPA’s goal with this checklist is to seek ways to minimize financial impacts while ensuring residents benefit from infrastructure investment and improved water quality. The financial alternative checklist is provided in Attachment F. Town of Lexington, MA (Project #0227871.16) 16 Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 6. Recommended Next Steps Upon completion of this Financial Capability Assessment, the following are recommendations for the Town to meet CWA requirements. Begin tracking all costs associated with stormwater activities: The Town should start to classify costs associated with any stormwater work to improve accuracy of actual and projected stormwater-related costs. This would include all costs related to personnel, professional services, equipment, supplies, and utilities. The operating costs included in this TM were approximated from the Stormwater Enterprise Fund Feasibility Report (Tighe & Bond, 2018) which estimated historical expenditures from FY2014 to FY2018. Accurate and up to date tracking of stormwater program costs would lend credibility and improve overall accuracy should the Town move forward with an alternative schedule request. Reconsider a Stormwater Enterprise Fund: In conjunction with the above recommendation, the Town may reconsider establishing a Stormwater Enterprise Fund. Having a dedicated Stormwater Enterprise fund would strengthen the ability of the Town to maintain debt service coverage for stormwater specific projects and build reserve funds. A dedicated fund would also allow for improved Stormwater planning and stability given unknown regulatory drivers. A Stormwater Enterprise Fund remains a viable funding source for the Town in the future if the timeline and costs associated with stormwater compliance becomes unmanageable within the tax levy. Establishing dedicated enterprise funds is typically seen as a best practice. Utilize SRF Grant and Loan Funding: The Town should utilize SRF grant and subsidized loan funding where interest rates are favorable to market rates. SRF funds can be used for a wide range of water, sewer, and stormwater projects and terms can help spread costs equitably among residents. Even when market rates are favorable, the Town should factor costs associated with bond issuance (underwriting expenses, management fees, premiums, etc.) to SRF debt service payments. Town of Lexington, MA (Project #0227871.16) Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 ATTACHMENT A - LEXINGTON STORMWATER ENTERPRISE FUND FEASIBILITY REPORT EXCERPT AND COST ALLOCATIONS Operating Budgets FY14 Actual FY15 Actual FY16 Actual FY17 Actual FY18 Actual Average 3200 - Highway Salaries & Wages 1,016,078$ 1,098,811$ 1,079,061$ 1,095,805$ 1,104,404$ 1,078,832$ Overtime 410,486$ 540,899$ 267,523$ 409,555$ 426,491$ 410,991$ Personal Services 1,426,564$ 1,639,710$ 1,346,584$ 1,505,360$ 1,530,895$ 1,489,823$ Contractual Services 979,600$ 1,118,196$ 769,995$ 1,004,757$ 1,137,782$ 1,002,066$ Utilities 210,421$ 272,836$ 147,528$ 142,321$ 191,922$ 193,006$ Supplies 913,714$ 996,323$ 787,079$ 786,591$ 776,486$ 852,039$ Small Capital 45,213$ 55,340$ 52,825$ 46,817$ 41,138$ 48,267$ Other Expenses 1,169,348$ 1,324,499$ 987,432$ 975,729$ 1,009,546$ 1,093,311$ 3100 - DPW Administration & Engineering Total 3120 Engineering 644,420$ 649,149$ 752,545$ 736,801$ 790,905$ 714,764$ Salaries & Wages 1,067,597$ 1,151,249$ 1,180,111$ 1,175,675$ 1,233,577$ 1,161,642$ Overtime 6,272$ 7,249$ 4,876$ 6,459$ 5,019$ 5,975$ Personal Services 1,073,869$ 1,158,498$ 1,184,987$ 1,182,134$ 1,238,596$ 1,167,617$ Contractual Services 315,361$ 239,951$ 246,391$ 182,892$ 187,288$ 234,377$ Historic Stormwater Expenditures (Table 2-1 from T&B Report) Labor and Contractual Services Highway & Drain Division Staff 115,962$ 123,081$ 111,769$ 98,365$ No Data 112,294$ Highway Staff (Regular + Overtime)4,432$ 4,778$ 4,314$ 3,881$ No Data 4,351$ Highway & Drain Div Contractual Services 241,037$ 214,776$ 229,000$ 219,216$ No Data 226,007$ Engineering Staff No Data No Data 173,085$ 169,464$ 191,030$ 177,860$ Engineering Professional Services 70,000$ 70,000$ 70,000$ 70,000$ 70,000$ 70,000$ All Other Operating Catch Basins 111,000$ 102,800$ 197,719$ 225,000$ 180,000$ 163,304$ Culverts 78,400$ 74,000$ 4,700$ 5,000$ 65,000$ 45,420$ Drain System 28,315$ 31,615$ 27,615$ 28,615$ 29,115$ 29,055$ BioBasins 15,000$ 5,300$ 9,900$ 5,000$ 10,000$ 9,040$ Sweeping 66,000$ 57,700$ 66,750$ 68,803$ 68,800$ 65,611$ Subtotal of Other Operating (Highway)298,715$ 271,415$ 306,684$ 332,418$ 352,915$ 312,429$ Operating Costs 730,146$ 684,050$ 894,852$ 893,344$ 613,945$ 902,942$ Assumed SW Allocation of Operating Budgets per T&B Report 3200 - Highway Salaries & Wages 11.41%11.20%10.36%8.98%10.41% Overtime 1.08%0.88%1.61%0.95%1.06% Personal Services 8.44%7.80%8.62%6.79%7.83% Contractual Services 24.61%19.21%29.74%21.82%22.55% Other Expenses 25.55%20.49%31.06%34.07%34.96%28.58% 3100 - DPW Administration & Engineering Salaries & Wages Overtime Personal Services 14.61%14.34%15.42%15.23% Contractual Services 22.20%29.17%28.41%38.27%37.38%29.87% Town of Lexington, MA (Project #0227871.16) Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 ATTACHMENT B – OPERATING COSTS Obj Actuals Estimate Projected Projected Projected Projected Projected Projected Projected Projected Projected Stormwater Operating Budget FY2023 FY2024 FY2025 FY2026 FY2027 FY2028 FY2029 FY2030 FY2031 FY2032 FY2033 3200 - Highway Personal Services $ 122,251 $ 123,931 $ 126,415 $ 128,943 $ 131,522 $ 134,153 $ 136,836 $ 139,572 $ 142,364 $ 145,211 $ 148,115 Contractual Services $ 263,372 $ 280,325 $ 288,026 $ 293,786 $ 299,662 $ 305,655 $ 311,768 $ 318,004 $ 324,364 $ 330,851 $ 337,468 Other Operating Expenses $ 370,344 $ 411,815 $ 390,211 $ 399,967 $ 409,966 $ 420,215 $ 430,720 $ 441,488 $ 452,526 $ 461,576 $ 470,808 3100 - DPW Admin & Engineering $ - $ - $ - $ - $ - $ - $ - $ - $ - $ - $ - Personal Services $ 233,698 $ 250,735 $ 260,298 $ 265,504 $ 270,814 $ 276,230 $ 281,755 $ 287,390 $ 293,138 $ 299,000 $ 304,980 Contractual Services $ 78,276 $ 85,956 $ 86,284 $ 88,010 $ 89,770 $ 91,565 $ 93,397 $ 95,265 $ 97,170 $ 99,113 $ 101,096 Subtotal $ 1,067,940 $ 1,152,762 $ 1,151,234 $ 1,176,210 $ 1,201,734 $ 1,227,819 $ 1,254,476 $ 1,281,719 $ 1,309,561 $ 1,335,752 $ 1,362,467 Other Indirect Costs (per SW Model) $ 448,210 $ 459,415 $ 470,901 $ 482,673 $ 494,740 $ 507,108 $ 519,786 $ 532,781 $ 546,100 $ 557,022 $ 568,163 PCP Phase 1 Non-Structural SCM Cost $ - $ - $ - $ 100,250 $ 100,250 $ 100,250 $ 102,255 $ 104,300 $ 106,386 $ 108,514 $ 110,684 PCP Phase 1 Municipal SCM O&M Cost $ - $ - $ - $ 1,121,000 $ 1,121,000 $ 1,121,000 $ 1,143,420 $ 1,166,288 $ 1,189,614 $ 1,213,406 $ 1,237,675 Total Stormwater Operating Costs $ 1,516,150 $ 1,612,177 $ 1,622,135 $ 2,880,133 $ 2,917,724 $ 2,956,177 $ 3,019,937 $ 3,085,088 $ 3,151,662 $ 3,214,695 $ 3,278,989 Drinking Water Operating Budget Compensation $ 769,073 $ 892,639 $ 971,418 $ 990,846 $ 1,010,663 $ 1,030,877 $ 1,051,494 $ 1,072,524 $ 1,093,974 $ 1,115,854 $ 1,138,171 Contractual Services $ 332,136 $ 365,300 $ 392,200 $ 400,044 $ 408,045 $ 416,206 $ 424,530 $ 433,020 $ 441,681 $ 450,515 $ 459,525 Supplies $ 102,903 $ 170,200 $ 174,200 $ 177,684 $ 181,238 $ 184,862 $ 188,560 $ 192,331 $ 196,177 $ 200,101 $ 204,103 Utilities $ 18,581 $ 17,000 $ 18,000 $ 18,360 $ 18,727 $ 19,102 $ 19,484 $ 19,873 $ 20,271 $ 20,676 $ 21,090 Small Equipment $ 800 $ 25,000 $ 30,000 $ 30,600 $ 31,212 $ 31,836 $ 32,473 $ 33,122 $ 33,785 $ 34,461 $ 35,150 Cash Capital $ 600,000 $ 800,000 $ 1,000,000 $ 1,020,000 $ 1,040,400 $ 1,061,208 $ 1,082,432 $ 1,104,081 $ 1,126,162 $ 1,148,686 $ 1,171,659 Debt $ 1,195,179 $ 2,375,661 $ 1,386,157 $ 1,386,157 $ 1,386,157 $ 1,386,157 $ 1,386,157 $ 1,386,157 $ 1,386,157 $ 1,386,157 $ 1,386,157 MWRA $ 8,493,467 $ 9,342,814 $ 10,277,096 $ 10,482,638 $ 10,692,291 $ 10,906,136 $ 11,124,259 $ 11,346,744 $ 11,573,679 $ 11,805,153 $ 12,041,256 OPEB $ 2,761 $ 2,761 $ 3,045 $ 3,106 $ 3,168 $ 3,231 $ 3,296 $ 3,362 $ 3,429 $ 3,498 $ 3,568 Indirect $ 977,093 $ 1,011,340 $ 968,301 $ 987,667 $ 1,007,420 $ 1,027,569 $ 1,048,120 $ 1,069,083 $ 1,090,464 $ 1,112,273 $ 1,134,519 Total Drinking Water Operating Costs $ 12,491,993 $ 15,002,715 $ 15,220,417 $ 15,497,102 $ 15,779,321 $ 16,067,184 $ 16,360,805 $ 16,660,298 $ 16,965,781 $ 17,277,373 $ 17,595,198 Wastewater Operating Budget Compensation $ 348,279 $ 421,922 $ 464,858 $ 474,155 $ 483,638 $ 493,311 $ 503,177 $ 513,241 $ 523,506 $ 533,976 $ 544,655 Contractual Services $ 184,801 $ 292,400 $ 308,400 $ 314,568 $ 320,859 $ 327,277 $ 333,822 $ 340,499 $ 347,308 $ 354,255 $ 361,340 Supplies $ 21,958 $ 79,000 $ 79,500 $ 81,090 $ 82,712 $ 84,366 $ 86,053 $ 87,774 $ 89,530 $ 91,321 $ 93,147 Utilities $ 128,846 $ 132,000 $ 132,500 $ 135,150 $ 137,853 $ 140,610 $ 143,422 $ 146,291 $ 149,217 $ 152,201 $ 155,245 Small Equipment $ 360 $ 14,000 $ 16,000 $ 16,320 $ 16,646 $ 16,979 $ 17,319 $ 17,665 $ 18,019 $ 18,379 $ 18,747 Cash Capital $ 300,000 $ 400,000 $ 500,000 $ 510,000 $ 520,200 $ 530,604 $ 541,216 $ 552,040 $ 563,081 $ 574,343 $ 585,830 Debt $ 1,561,467 $ 1,406,381 $ 1,592,858 $ 1,592,858 $ 1,592,858 $ 1,592,858 $ 1,592,858 $ 1,592,858 $ 1,592,858 $ 1,592,858 $ 1,592,858 MWRA $ 8,432,789 $ 9,349,530 $ 10,284,483 $ 10,490,173 $ 10,699,976 $ 10,913,976 $ 11,132,255 $ 11,354,900 $ 11,581,998 $ 11,813,638 $ 12,049,911 OPEB $ 3,004 $ 3,004 $ 609 $ 621 $ 634 $ 646 $ 659 $ 672 $ 686 $ 700 $ 714 Indirect $ 542,416 $ 588,040 $ 596,525 $ 608,456 $ 620,625 $ 633,037 $ 645,698 $ 658,612 $ 671,784 $ 685,220 $ 698,924 Total Wastewater Operating Costs $ 11,523,920 $ 12,686,277 $ 13,975,733 $ 14,223,391 $ 14,476,001 $ 14,733,664 $ 14,996,480 $ 15,264,553 $ 15,537,986 $ 15,816,889 $ 16,101,370 Total Operating Costs $ 25,532,063 $ 29,301,169 $ 30,818,285 $ 32,600,626 $ 33,173,046 $ 33,757,025 $ 34,377,222 $ 35,009,939 $ 35,655,429 $ 36,308,957 $ 36,975,556 Town of Lexington, MA (Project #0227871.16) Woodard & Curran, Inc. 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Financial Capability Assessment TM June 28, 2024 ATTACHMENT D - REVENUE REQUIREMENTS FOR WATER, WASTEWATER, AND STORMWATER Town of Lexington, MA Stormwater Rate Study Revenue Requirement Projection Stormwater Fund Estimated FY2023 FY2024 FY2025 FY2026 FY2027 FY2028 FY2029 FY2030 FY2031 FY2032 FY2033 Operational Costs $1,516,150 $1,612,177 $1,622,135 $2,880,133 $2,917,724 $2,956,177 $3,019,937 $3,085,088 $3,151,662 $3,214,695 $3,278,989 Existing Debt Service $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 Capital Program Costs $0 $634,296 $1,377,000 $3,022,259 $3,368,971 $3,360,268 $3,366,600 $835,495 $835,495 $835,495 $835,495 Total $1,516,150 $2,246,473 $2,999,135 $5,902,392 $6,286,695 $6,316,445 $6,386,538 $3,920,584 $3,987,157 $4,050,190 $4,114,484 Annual Increase (%)10.89%48.17%33.50%96.80%6.51%0.47%1.11%-38.61%1.70%1.58%1.59% DW Fund Estimated FY2023 FY2024 FY2025 FY2026 FY2027 FY2028 FY2029 FY2030 FY2031 FY2032 FY2033 Operational Costs $12,491,993 $15,002,715 $15,220,417 $15,497,102 $15,779,321 $16,067,184 $16,360,805 $16,660,298 $16,965,781 $17,277,373 $17,595,198 Existing Debt Service $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 Capital Program Costs $0 $0 $2,334,678 $2,533,031 $6,729,502 $2,629,214 $2,735,434 $0 $0 $0 $0 Total $12,491,993 $15,002,715 $17,555,095 $18,030,133 $22,508,823 $18,696,398 $19,096,239 $16,660,298 $16,965,781 $17,277,373 $17,595,198 Annual Increase (%)0.35%20.10%17.01%2.71%24.84%-16.94%2.14%-12.76%1.83%1.84%1.84% WW Fund Estimated FY2023 FY2024 FY2025 FY2026 FY2027 FY2028 FY2029 FY2030 FY2031 FY2032 FY2033 Operational Costs $11,523,920 $12,686,277 $13,975,733 $14,223,391 $14,476,001 $14,733,664 $14,996,480 $15,264,553 $15,537,986 $15,816,889 $16,101,370 Existing Debt Service $0 $0 $67,107 $67,107 $67,107 $67,107 $67,107 $67,107 $67,107 $67,107 $67,107 Capital Program Costs $0 $0 $628,107 $1,193,268 $1,344,886 $1,286,100 $1,335,347 $67,107 $67,107 $67,107 $67,107 Total $11,523,920 $12,686,277 $14,670,947 $15,483,765 $15,887,994 $16,086,870 $16,398,934 $15,398,766 $15,672,200 $15,951,103 $16,235,583 Annual Increase (%)6.16%10.09%15.64%5.54%2.61%1.25%1.94%-6.10%1.78%1.78%1.78% Total Revenue Requirement $25,532,063 $29,935,465 $35,225,176 $39,416,290 $44,683,512 $41,099,714 $41,881,710 $35,979,648 $36,625,137 $37,278,666 $37,945,265 Annual Increase (%)3.49%17.25%17.46%17.77%12.16%-8.23%-3.85%-14.40%1.84%1.83%1.83% Town of Lexington, MA (Project #0227871.16) Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 ATTACHMENT E - AFFORDABILITY PROJECTION SCENARIO:Baseline Compliance Scenario Other Scenarios END YEAR:2028 2033 MEASURE:Total Cost Increase SW Cost per HH ($) DW Cost per HH ($) WW Cost per HH ($) Total Cost Per Household Median HH Income ($) Cost / Income % Rate Increase SW Cost per HH ($) DW Cost per HH($) WW Cost per HH ($) TotalCost per HH ($) Median HH Income ($) Cost / Income % 2023 0%122.42$ 1,008.64$ 930.47$ 2,061.53$ 208,386$ 1.0%0%122.42$ 1,008.64$ 930.47$ 2,061.53$ 208,386$ 1.0% 2024 17%181.39$ 1,211.36$ 1,024.33$ 2,417.07$ 210,470$ 1.1%17%181.39$ 1,211.36$ 1,024.33$ 2,417.07$ 210,470$ 1.1% 2025 18%242.16$ 1,417.45$ 1,184.57$ 2,844.18$ 212,575$ 1.3%18%242.16$ 1,417.45$ 1,184.57$ 2,844.18$ 212,575$ 1.3% 2026 12%476.58$ 1,455.80$ 1,250.20$ 3,182.58$ 214,701$ 1.5%8%364.95$ 1,455.80$ 1,250.20$ 3,070.96$ 214,701$ 1.4% 2027 13%507.61$ 1,817.43$ 1,282.84$ 3,607.87$ 216,848$ 1.7%13%367.98$ 1,817.43$ 1,282.84$ 3,468.25$ 216,848$ 1.6% 2028 -8%510.01$ 1,509.60$ 1,298.90$ 3,318.51$ 219,016$ 1.5%-8%371.09$ 1,509.60$ 1,298.90$ 3,179.59$ 219,016$ 1.5% 2029 2%515.67$ 1,541.88$ 1,324.10$ 3,381.65$ 221,206$ 1.5%2%376.24$ 1,541.88$ 1,324.10$ 3,242.22$ 221,206$ 1.5% 2030 -14%316.56$ 1,345.20$ 1,243.34$ 2,905.10$ 223,418$ 1.3%-8%384.15$ 1,345.20$ 1,243.34$ 2,972.69$ 223,418$ 1.3% 2031 2%321.93$ 1,369.87$ 1,265.42$ 2,957.22$ 225,652$ 1.3%2%392.22$ 1,369.87$ 1,265.42$ 3,027.51$ 225,652$ 1.3% 2032 2%327.02$ 1,395.02$ 1,287.94$ 3,009.99$ 227,909$ 1.3%2%400.07$ 1,395.02$ 1,287.94$ 3,083.03$ 227,909$ 1.4% 2033 2%332.22$ 1,420.69$ 1,310.91$ 3,063.81$ 230,188$ 1.3%2%408.07$ 1,420.69$ 1,310.91$ 3,139.66$ 230,188$ 1.4% 2034 2%337.51$ 1,446.86$ 1,334.34$ 3,118.71$ 232,490$ 1.3%2%408.07$ 1,446.86$ 1,334.34$ 3,189.27$ 232,490$ 1.4% Town of Lexington, MA (Project #0227871.16) Woodard & Curran, Inc. Financial Capability Assessment TM June 28, 2024 ATTACHMENT F - FINANCIAL ALTERNATIVE ANALYSIS CHECKLIST Financial Alternatives Analysis Describe how Financial Alternative has been implemented or considered. Where considered, include any plans from community to pursue Alternative Where tools not pursued, describe any associated challenges with the Alternative (e.g., impact to bond rating, interest rate not favorable) Describe outcomes of Alternative (e.g., grant applied for, loan not pursued) a) Has the community discussed financing options, including timing, terms, and potential grants or forgiveness, with the responsible State Revolving Fund? The Town has considered SRF funding for Stormwater and would be interested should the MA CWSRF consider stormwater management activities eligible for 0% financing under WW nutrient management projects or if interest rates are favorable. SRF funding would only be advantageous for the Town if they were eligible for 0% financing or if the SRF program has a lower market rate. The Town has a strong bond rating (Aaa) and has historically received lower market rates then SRF The Town is evaluating pursuing the MA CWSRF funding for some of the PCP Phase 1 Structural SCM projects. Grant application may be submitted depending on status of design and timing of planned construction. b) What additional funding sources beyond the SRF such as grants, low-cost loans, or extended term loans has the community considered? The Town had a Funding Opportunity Summary prepared as part of their PCP work. This includes several grant opportunities from MassDEP such as Municipal Vulnerability Preparedness, Water Management Act, and the Stormwater MS4 Municipal Assistance Grand Program. Challenges with pursuing MassDEP grant opportunities include application deadline, frequency of future funding availability and aligning projects with a particular program. The Town has applied for MVP grant and is awaiting award. The Town is also involved with a Stormwater MS4 grant through the Charles River Water Association but is not the direct applicant. c) Has the community considered special assessment districts to finance geographically defined project work? No Stormwater work is completed Townwide N/A Example Financial Alternatives Analysis Worksheet 1. Financing Options for Capital Costs: Financial Alternatives Analysis Describe how Financial Alternative has been implemented or considered. Where considered, include any plans from community to pursue Alternative Where tools not pursued, describe any associated challenges with the Alternative (e.g., impact to bond rating, interest rate not favorable) Describe outcomes of Alternative (e.g., grant applied for, loan not pursued) 1. Financing Options for Capital Costs:d) Has the community considered other revenue sources such as sales or property taxes, rental income from water tower leases, or other potential sources of support? The Town currently funds stormwater with general funds (from property tax revenues). Implementing a Stormwater Fee would be the only additional revenue source. N/A The Town has conducted Stormwater Enterprise Fund Feasibility Study and ultimately did not move forward. Some political resistance to implementing additional fee. e) Has the community evaluated how it can reduce overall operating and program costs? Nutrient reduction requirements as part of the Town's MS4 and Phase 1 PCP directly require additional operating and program costs. N/A Town is Planning for increased expenditures to meet PCP requirements. Without new permit issuance including credit policy and associated reductions, no clear way to reduce costs. > Other Considerations: a) In what ways has the community evaluated modifications to its rate structure that could increase revenue and/or reduce burden on the lowest income residents? The community does not have a dedicated rate for Stormwater at this point in time but could consider a low income credit policy should they establish a fund. The Town does have dedicated water and sewer rates. N/A Stormwater fund has not been established but Town may reconsider should costs substantially increase. b) Has the community prepared a forward-looking financial plan and rate analysis within the last five years? If so, was the plan implemented? Yes. Plan is currently being implemented. Ongoing. 2. Rate Design: Financial Alternatives Analysis Describe how Financial Alternative has been implemented or considered. Where considered, include any plans from community to pursue Alternative Where tools not pursued, describe any associated challenges with the Alternative (e.g., impact to bond rating, interest rate not favorable) Describe outcomes of Alternative (e.g., grant applied for, loan not pursued) 1. Financing Options for Capital Costs:c) Does the community have identified separate rate structures for commercial, industrial, and wholesale customers reflecting their particular demands on the collection and treatment system? Has the utility considered tier- based rates? The Town does not have separate rate structures for residential/commercial/industrial customers but does have different rate structures for wholesale and municipal users. The Town does use tiered rates for residential/commercial/industrial. The Town is a member community of the MWRA and only handles collection/distribution systems. MWRA provides treatment for member communities. N/A d) Does the community use inclining block rates that charger higher per gallon rates for higher increments of use? Yes N/A N/A e) If charging a flat fee, has the community considered switching to a volumetric fee so that high- output customers pay for the wastewater they generate? N/A N/A N/A > Other Considerations: a) Does the community currently have, or looked into, setting up a CAP? The Town does not have a customer assistance program N/A N/A 3. Ratepayer Support Options for Lower Income Residential Customers: Financial Alternatives Analysis Describe how Financial Alternative has been implemented or considered. Where considered, include any plans from community to pursue Alternative Where tools not pursued, describe any associated challenges with the Alternative (e.g., impact to bond rating, interest rate not favorable) Describe outcomes of Alternative (e.g., grant applied for, loan not pursued) 1. Financing Options for Capital Costs:b) If you have a CAP, what is the enrollment rate? What efforts have been made to ensure low- income households are informed about the program and enroll? Are there ways to make the application process easier for customers to enroll, e.g., by providing for enrollment in- person, online, and mail, in multiple languages, if appropriate; partnering with local organizations to help with outreach and enrollment; allowing for automatic enrollment or using proof of eligibility for other income- qualified benefits? N/A N/A N/A c) Has the community considered other types of customer support beyond a CAP for lower income residential customers? The Town does partner with local community programs offering rental assistance to low income households. The Town also has an Emergency Assistance Fund (LEAF) to support residents experiencing an unexpected financial crisis. N/A N/A d) Are there policies in place to protect customers, including vulnerable populations, from shutoffs? Unknown Financial Alternatives Analysis Describe how Financial Alternative has been implemented or considered. Where considered, include any plans from community to pursue Alternative Where tools not pursued, describe any associated challenges with the Alternative (e.g., impact to bond rating, interest rate not favorable) Describe outcomes of Alternative (e.g., grant applied for, loan not pursued) 1. Financing Options for Capital Costs:e) Does the community have reduced rates for vulnerable populations, such as seniors on fixed incomes? Unknown > Other Considerations: a) Is the utility accounted for as a proprietary/enterprise fund or a separate independent utility? There is a water enterprise and sewer enterprise funds. Stormwater is funded through DPW and Highway budgets. Stormwater enterprise fund not established b) Are all rate revenues or other user charges used to fund the utility's operations? Do the rates charged recover the full cost of providing wastewater services (taking into consideration capital costs, operation and maintenance expenses, and environmental costs)? Both the water and sewer rates recover the full cost of providing service and generally generate retained earnings. Stormwater does not generate any user fees. c) Does the utility have programs to optimize maintenance and asset management to reduce life cycle costs? The Town is applying for an Asset Management Grant through the SRF program, which will allow for asset management to be optimized. 4. Financial and Utility Management: Financial Alternatives Analysis Describe how Financial Alternative has been implemented or considered. Where considered, include any plans from community to pursue Alternative Where tools not pursued, describe any associated challenges with the Alternative (e.g., impact to bond rating, interest rate not favorable) Describe outcomes of Alternative (e.g., grant applied for, loan not pursued) 1. Financing Options for Capital Costs:d) Are partnerships with other utilities, including joint procurement, or shared management and staffing arrangements, regionalization or consolidation options to proved economies of scale and reduce per customer costs feasible in this community? The Town is a member of MWRA which provides water and sewer service to many MA communities. The MWRA provides economies of scale in terms of treatment. e) Has the utility or related municipality instituted a stormwater management program when evaluating long-term control plan schedules? If so, are impervious area-based stormwater fees used to fund the stormwater compliance costs? The Town has instituted a stormwater management program to meet long-term control plan schedules. The Town has not implemented stormwater fees to fund compliance costs. The Town has conducted a study to implement a stormwater fee based on impervious area but has not moved forward. f) Does the utility provide direct financial assistance (through rebates, upfront subsidies, or direct replacement of fixtures) for efficiency improvements including leak repairs or replacement of inefficient fixtures or appliances? Unknown > Other Considerations: Attachment 4: Non-Structural SCM Documentation CLIENT:Town of Lexington, MassachusettsPROJECT:Phosphorus Control PlanDESIGNED BY:CNQDATE:6/28/2024CHECKED BY:ZHDATE:6/28/2024PROJECT NO.227871.1240 Shattuck Road, Suite 110Andover, MA 01810Tel: 978.557.8150 Fax: 978.557.7948FallSpringMaterial Mass (lbs) per Volume (CY) (From UNH Stormwater Center)232.51,559Collected Volume of Street Sweepings (CY)30080Total Collected Wet Mass of Street Sweepings (lb)69,750124,720FallSpringDry Mass (lb) = 36,27097,282FallSpringTP Removed (lb) =31.0840.27Net Reduction (lbs/year)71.36Phosphorus Load Reduction (lbs/year)Enhanced Sweeping1.96 98.5 1.93Net Reduction (lbs/year)1.93NOTES:1. Clean Sweep Memorandum for enhanced sweeping credit: 2x/year sweeping using a mechanical broom sweeper. Entire paved area (driveways, parking lots, sidewalks, patios, etc.) is swept. Use Medium-Density Residential Land Use Export Rate.Town-Owned Non-Structural Phosphorus Reduction Analysis - Clean Sweep PolicyMeasured Organic Matter Collection CreditModel-Based Street Cleaning CreditMassGIS Land Use (2016)Export Rate (lbs/ac/year)Roadway Area (ac)Medium-Density Residential Attachment 4: Semi-Structural SCM Documentation ‣Disconnection through storage (e.g. rain barrels)21% to 92% Total Phosphorus (TP) reduction depending on storage volume, Hydrologic Soil Group (HSG), and release rate‣Disconnection (e.g curb/CB removal) (Blossom St)3% to 85% TP reductionImpervious Area Disconnection ‣Road narrowing, cul-de-sac & intersection cut outs (Middle St vs. Barrymeade Dr.)70% to 98% TP removal Impervious Area Removal ‣Incorporation of soil amendments, tilling, and establishing dense vegetation41% to 92% TP reduction (pervious area loading (lb/yr) is low to begin with, so this will not provide high reductions) Conversion of Low to High Permeable Pervious Area Impervious Area Reduction Example Discussion‣GIS data/mapping of street curbs‣Opportunities to incorporate into roadway/maintenance effortsLimited maintenanceLow cost but also less benefit‣Potential for additional credit opportunities (buffer, bank stabilization, stream restoration, etc.) in future permits Attachment 5: Structural SCM Documentation Updated Existing SCM Tracking Spreadsheet Municipal Infiltration Trench As-Builts CLIENT:Town of Lexington, MassachusettsPROJECT:Phosphorus Control Plan40 Shattuck Road, Suite 110DESIGNED BY:CNQDATE:6/28/2024Andover, MA 01810CHECKED BY:DATE:Tel: 978.557.8150 Fax: 978.557.7948PROJECT NO.227871.12Property Application Date Parcel ID Address Municipal/Private Facility Land Use BMP TypeSoil Infiltration Rate (in/hr)Impervious Drainage Area (AC)Pervious Drainage Area (AC)Pervious Drainage Area Soil TypeBMP Storage Volume (cf)BATT Reduction (lbs/year)BATT Total Property Reduction (lbs/year)BMP ID (MGT#)2022 BMP Field Verification? (Y/N)If N, why?Bioretention-0.270.18C6790.24MGT 150YInfiltration Chambers2.410.480.88C8910.90MGT 148YInfiltration Chambers2.410.771.08C2,7501.56MGT 146Y12/12/200739-1010 Pelham RdPrivateApartmentsCommerical-----------Dry Well1.020.05--280.03MGT 305YVegetated filter strip1.020.35---0.20MGT123Y36/6/201143-9D3 Forbes RdPrivateLaboratory CampusCommericalWet Pond-1.22--4,7321.251.25---49/2/202218-2B99 Hayden AvePrivateOfficesCommericalInfiltration Chambers - Not Yet Constructed----------56/28/200651-56A727 Marrett RdPrivateHotelCommericalConstructed Wetlands1.024.07--14,7743.843.84MGT 286YInfiltration Chambers0.171.17--1,6121.14MGT 333YInfiltration Basin0.170.35--4210.41MGT 329NNo site plans during site visit. 2/3/201018-15F200 Shire WayPrivateOfficesCommerical/Industrial-----------PrivateInfiltration Chambers2.410.81--13,8091.421.42MGT 273Y8/1/200718-4A92 Hayden AvePrivateOfficesCommerical/Industrial-----------2/2/201652-8BInfiltration trenches - Outside Town Line2.410.94-------6/2/201452-7BInfiltration trench (Underfield Storage)2.414.32--16,4006.45MGT 201Y9/10/2018 52-53022 Massachusetts Ave/752 Marrett RdPrivate Eversource Commerical/Industrial - - - - - - - - - - -6/12/200116-53H7 Clematis RdPrivateChurchCommerical/Industrial-----------4/19/201117-1980 Hayden AvePrivateOfficesCommerical/Industrial-----------94/2/20085-11A1075 Waltham StPrivateBankCommericalInfiltration Chambers1.020.120.01C4800.210.21MGT 279Y8/28/200942-54594 Marrett RdPrivateOfficesCommerical/Industrial-----------103/11/201332-16324 Marrett RdPrivateCumberland FarmsCommericalInfiltration Chambers2.410.14--4,3320.250.25MGT 282YInfiltration Chambers2.410.840.72B7,9751.56MGT 171YInfiltration Chambers2.410.200.08B1,7280.36MGT 140YBioretention - Infiltration Basin2.410.080.26B8520.17MGT 139YPorous Pavement-0.900.19B-0.82MGT 138YDetention Pond2.410.734.33A8,6050.20MGT 141YInfiltration Chambers1.021.240.10C4,5912.14MGT 187Y1.39A0.64CInfiltration Chambers1.020.820.16C3,1141.44MGT 183YBioretention - Infiltration Basin2.410.501.87A1,7650.92MGT 188YBioretention - Infiltration Basin1.020.330.70C1,7070.72MGT 190YBioretention - Infiltration Basin1.020.090.78C1,5190.31MGT 189YPorous Pavement-0.930.12C-0.84MGT 205YInfiltration Chambers1.021.946--5,5503.17MGT 302NUnder construction.Permeable Pavement1.02-0.34D-----Infiltration Pond0.17-0.18D2,525----Infiltration Chambers1.020.780.33B1,4121.13MGT 268YInfiltration Chambers0.270.320.04B5800.41MGT 269Y4/5/20053-1A75 Concord AvePrivateCommunication towerCommerical/Industrial----------Infiltration Chambers2.411.47--3,2902.39MGT 264NUnder construction. Infiltration Chambers2.412.05--5,1703.41MGT 267NOvergrown. Unable to confirm location. Infiltration Chambers0.521.17--2,1151.56MGT 306Y4.12C15.97D4/1/201143-128A/B690 Marrett/Route 128PrivateMcDonalds/Gas StationCommerical/IndustrialDry Pond----------1610/2/201412-3187 Spring StPrivateTherapeutic Day SchoolCommericalInfiltration Chambers2.410.05--4750.090.09MGT 200Y177/30/199931-63D39 Marrett RdMunicipalCommunity CenterCommericalInfiltration Basin2.411.14--7,4462.032.03MGT 322NNo site plans during site visit. 184/10/202310-15915 Waltham StreetPrivateGas StationCommerical/IndustrialInfiltration Chambers0.170.11--402.20.180.18---Non-Residential Total Credit (lbs/year)52.67MunicipalPrivatePrivateMunicipalMunicipalPrivateMGT 18213YMGT 265 YInfiltration ChambersCommerical/Industrial51-45A 7 Crosby Rd School Commerical1050 Waltham10-41A12/21/20152/12/2015675/8/2017Commerical12School Commerical31-65A1 32-177CJonas Clarke Middle School - LexingtonCommerical17 Stedman Rd11 12/28/2017815-45BBowman Elementary School5/9/2016 9 Philip Rd Commerical2CommericalOffices45-55 Hayden Ave17-21A-110-62332 Concord AveChildcarePrivatePrivate Lab/Offices7/29/202020 Pelham RdOpen Land5-14756-758 Marrett Rd11/15/201714CommericalCotting School453 Concord AveCommericalOffices18-15D (300 Shire Way), 18-15F (200 Shire Way), 18-15G (400 Shire Way)8/12/201918-15D/F/G4/11/2008150.235,01615.10-Wet Pond2.041.081.021.546.453.128.413.171.5413,661 8.9016.26Non-Residential Properties2.70MunicipalMinuteman High School1 of 4 CLIENT: Town of Lexington, MassachusettsPROJECT: Phosphorus Control Plan40 Shattuck Road, Suite 110DESIGNED BY: LFE DATE: 5/30/2023Andover, MA 01810CHECKED BY: DATE:Tel: 978.557.8150 Fax: 978.557.7948PROJECT NO. 227871.12Property Application Date Parcel ID Address Municipal/Private Facility Land Use BMP TypeSoil Infiltration Rate (in/hr)Impervious Drainage Area (AC)Pervious Drainage Area (AC)Pervious Drainage Area Soil TypeBMP Storage Volume (cf)BATT Reduction (lbs/year)BATT Total Property Reduction (lbs/year)BMP ID (MGT#)2022 BMP Field Verification? (Y/N)If N, why?Infiltration Chambers #11.020.17--3,2690.38MGT 293Y0.65B0.28DInfiltration Chambers #31.020.32--1,8540.74MGT 294YInfiltration Chambers #40.170.07--8500.15MGT 295YInfiltration Basin North (#5)1.020.30--2,1010.70MGT 296Y0.14B0.19DInfiltration Chambers #70.170.18--1,6080.38MGT 298Y0.20B0.13D0.65B0.28D8/15/2007Wet Detention Basin 2007-0.281.10C5030.36MGT 330YInfiltration Chambers1.952.512.06A4,5604.94MGT 331NUnder construction. Green Roof--------Extended Dry Detention-0.321.53A5750.07MGT 332NUnder construction.Infiltration Chambers 12.410.970.71A3,5132.23MGT 217YInfiltration Chambers 21.020.380.92A3,4060.88MGT 219YInfiltration Chambers 31.020.441.38A7910.84MGT 216YBioretention/Infiltration Basin 11.020.050.05A1570.11MGT 215YBioretention/Infiltration Basin 22.410.060.03A2260.14MGT 214YBioretention/Infiltration Basin 31.020.120.35A2180.25MGT 218Y3/1/201850-2345 Lincoln StPrivateSingle FamilyMedium-Density Residential-----------46/4/201324-7A62 Grassland StPrivateSingle FamilyMedium-Density ResidentialImpervious Area Removal0.170.01---0.020.02MGT 211Y511/3/202024-5G72 Grassland StPrivateSingle Family Single Family ResidentialInfiltration Chambers1.020.030.16B4500.080.08MGT 212NCould not access backyard. 5/22/201587-11151 Grove StPrivateSingle FamilySingle Family Residential-----------69/23/20089-8310 Concord AvePrivateSingle FamilyMedium-Density ResidentialInfiltration Chambers2.410.00--620.010.01MGT 213YInfiltration Chambers2.410.22--1,6250.50MGT 210YInfiltration Basin2.410.34--3,2550.78MGT 209Y5/14/201225-18 Cutler Farm RdPrivateSingle FamilyMedium-Density ResidentialInfiltration Chambers8.270.06--4490.12MGT 225Y5/14/201225-18 Cutler Farm RdPrivateSingle FamilyMedium-Density ResidentialInfiltration Trench8.270.02--2400.05MGT 224Y94/6/200625-613 Cutler Farm RdPrivateSingle FamilyMedium-Density ResidentialInfiltration Chambers2.410.02--2550.040.04MGT 226Y104/30/200825-414 Cutler Farm RdPrivateSingle FamilyMedium-Density ResidentialInfiltration Chambers2.000.06--4030.120.12MGT 227Y1111/9/201542-218116 School StPrivateSingle FamilyMedium-Density ResidentialInfiltration Chambers0.270.11--9320.200.20MGT 245YInfiltration Chambers8.270.030.00-1760.05MGT 236YInfiltration Chambers8.270.020.00-1040.03MGT 237Y5.760.020.00-1570.03MGT 220Y5.760.010.00-900.01MGT 221Y5.760.050.09B6310.09MGT 222Y3/7/20139-105C19 Wellington LnPrivateSingle Family------------149/6/200517-159 Woodcliffe RdPrivateSingle FamilyLow-Density ResidentialInfiltration Chambers0.500.050.00-2690.070.07MGT 223NCould not access backyard. Fenced. 11/7/200811-6231 Barberry RdPrivateSingle Family------------11/7/200811-6133 Barberry RdPrivateSingle Family------------151/27/200624-47B66 Valleyfield StPrivateSingle FamilyLow-Density ResidentialSubsurface Infiltration Trench0.500.050.00-610.040.04MGT 246NCould not access backyard. Fenced. 164/18/201325-84A65 Munroe RdPrivateSingle FamilyMedium-Density ResidentialInfiltration Chambers0.500.060.00-4710.110.11MGT 242 Y 173/25/201417-1866 Munroe RdPrivateSingle FamilyMedium-Density ResidentialInfiltration Chambers5.980.050.00-5800.100.10MGT 241YInfiltration Chambers0.520.080.08C7570.160.16MGT 239YInfiltration Chambers0.520.010.02C2440.020.02MGT 238Y1/16/200610-15 Stonewall RdPrivateSingle FamilyLow-Density ResidentialProposed Pervious Pavers----------10-37C 411 Concord Ave Private Single Family - - - - - - - -- - -19 5/22/2012 11-47 470 Concord Ave Private Single Family Low-Density Residential Infiltration Chambers 8.27 0.05 - - 3580.07 0.07 MGT 240 Y20 6/9/2015 17-17 60 Munroe Rd Private Single Family Medium-Density Residential Infiltration Chambers 0.17 0.08 - - 445 0.16 0.16 MGT 243 YPrivatePrivatePrivatePrivatePrivate123712Private0.370.551.05High Density ResidentialInfiltration Basin East15-67B5/17/2005 11-59 Low-Density Residential23-13-16Low-Density ResidentialHigh Density ResidentialCondos443 Lincoln St (Hobbs Brook Ln)Residential Properties1.020.17Infiltration Chambers #60.411.02High Density Residential1.066.95Infiltration Chambers10 Philip Rd Single Family Medium-Density Residential18 11/26/2014YMGT 297 YMGT 2914/12/2019YMGT 290 Y56 Watertown St Assisted Living960-1010 Waltham5-20; 5-21A5.00Infiltration Chambers #22,790181MGT 2922/20/2018835-2Single Family6/10/20084/30/2019 High Density ResidentialAssisted Living53-55 Watertown St3-157/17/2017Independed Living13Private4218964.441.280.160.070.142.010.460.7237 Barberry Rd Single Family33 Dawes Rd1.02Infiltration Basin West2 of 4 CLIENT: Town of Lexington, MassachusettsPROJECT: Phosphorus Control Plan40 Shattuck Road, Suite 110DESIGNED BY: LFE DATE: 5/30/2023Andover, MA 01810CHECKED BY: DATE:Tel: 978.557.8150 Fax: 978.557.7948PROJECT NO. 227871.12Property Application Date Parcel ID Address Municipal/Private Facility Land Use BMP TypeSoil Infiltration Rate (in/hr)Impervious Drainage Area (AC)Pervious Drainage Area (AC)Pervious Drainage Area Soil TypeBMP Storage Volume (cf)BATT Reduction (lbs/year)BATT Total Property Reduction (lbs/year)BMP ID (MGT#)BMP Field Verification? (Y/N)If N, why?Infiltration Chambers 2.41 0.09 - - 549 0.17 0.17 MGT 232 YInfiltration Chambers 2.41 0.06 - - 384 0.13 0.13 MGt 233 Y22 9/22/2010 24-1 71 Bridge St Private Single Family Medium-Density Residential Dry well 0.00 - - 156 0.01 0.01 MGT 247 Y8/10/2010 24-8910 Stedman (32 Brookside Ave)Private Single Family - - - - - - - - - - - -Infiltration Chambers 2.41 0.01 - - 114 0.02 MGT 228 YInfiltration Trench 2.41 0.01 - - 75 0.02 MGT 229 YInfiltration Chambers 1.02 0.02 - - 808 0.04 MGT 230 N Unable to communicate with resident. Could not access.Infiltration Chambers 1.02 0.04 - - 708 0.08 MGT 325 N Unable to communicate with resident. Could not access.10/26/2010 25-230 10 Winston Private Single Family - - - - - - -- - - - -Infiltration Chambers 2.41 0.02 - - 149 0.04 MGT 234 YInfiltration Trench 2.41 0.02 - - 36 0.03 MGT 326 N Could not access backyard. 5/11/2010 31-89A 2 Paddock Ln Private Single Family - - - - - - -- - - - -4/7/2015 9-18 6 Blossom St Private Single Family - - - - - - - - - -- -Infiltration Chambers 5.98 0.04 - - 230 0.07 MGT 248 YInfiltration Chambers 5.98 0.03 - - 259 0.06 MGT 327 N Could not access backyard. 27 1/7/2005 34-63 26 Middle St Private Single Family Medium-Density Residential Infiltration Chambers 2.41 0.03 - - 220 0.06 0.06 MGT 253 Y28 11/5/2008 34-78 64 Middle St Private Single Family Medium-Density Residential Infiltration Chambers 1.02 0.01 - - 13 0.01 0.01 MGT 259 Y2/13/2009 8-64 3 Crescent Rd Private Single Family - - - - - - - -- - - -Infiltration Chambers8.270.03--1800.05MGT 252YInfiltration Trench8.240.01--2200.02MGT 251Y34-47A 31 Cary Ave Private Infiltration Chambers 0.17 0.053- - 95 0.07 MGT 256 Y34-47B 33 Cary Ave Private Infiltration Chambers 0.17 0.065- - 117 0.08 MGT 255 Y34-47E 35 Cary Ave Private Infiltration Chambers 0.17 0.051- - 92 0.07 MGT 254 Y34-48C Cary Ave Private Detention Basin - 0.142 - - 516 0.03 MGT 328 N No site plans during site visit. Infiltration Chambers 1.02 0.017 - - 251 0.03 MGT 257 YInfiltration Chambers 1.02 0.021 - - 375 0.04 MGT 258 N Could not access backyard. Fenced. Infiltration Chambers 8.27 0.10 - - 359 0.23 MGT 284 YInfiltration Chambers2.410.43--1,5530.97MGT 285YLeaching CB2.410.05--1780.11MGT 323YExfiltrating Bioretention - Infiltration Basin1.020.291.78C2,7141.01MGT 263YExfiltrating Bioretention - Infiltration Basin1.020.682.64C4,3102.13MGT 262YInfiltration Chambers2.410.910.38B12,3262.12MGT 270YInfiltration Chambers2.410.580.67B9,6721.41MGT 271NCould not access backyard. Fenced. Wetland Replication-2.054.89B1,1241.05MGT 324NCould not access backyard. Fenced. Infiltration Chambers2.410.38-2,0790.89MGT 277YInfiltration Chambers2.410.08-6130.19MGT 275YInfiltration Chambers 2.41 0.08 - 493 0.20 MGT 274 YInfiltration Basin 2.41 9.34 - 9,057 15.98 MGT 276 YMultiple Retention North- Outlet at pond bottom - 0 0.00 0.00 - - -MultipleRetention South - Outlet at pond bottom- 0 0.00 0.00 - - -37Dry Wells 2.41 0.44 - - 1,871 0.85 MGT 307-MGT 320 Y38Infiltration Chambers 2.41 0.35 0.23 A 1,122 0.67 MGT 45 Y39 1/10/2022 34-66 32 Middle St Private Single Family Medium-Density Residential Infiltration Chambers 2.41 0.05 - - 762 0.10 0.10 MGT 321 YInfiltration Chamber (IS-1) 1.02 0.03 -- B 632 0.06 - - -Infiltration Chamber (IS-2) 1.02 0.06 -- B 550 0.11 - - -41 9/19/2023 31-16 21 Richard Road Private Single Family Medium-Density Residential -- -- -- -- -- -- 0.00 0.00 - - -Infiltration Chamber (INF-1) 2.41 0.03 -- 241 0.07 - - -Infiltration Chamber (INF-2) 2.41 0.03 -- 241 0.07 - - -43 6/20/2023 25-92 25 Munroe Road Private Single Family Medium-Density Residential Infiltration Chamber 2.41 0.08 --A 624 0.15 0.15 - - -44 6/2/2023 51-54A 7 Crosby Road Municipal Elementary School Com/Ind -- -- -- -- -- -- 0.00 0.00 - - -Infiltration Chamber (INF-1) 0.03 -- 278 0.06 - - -Infiltration Chamber (INF-2) 0.03 -- 274 0.06 - - -46 2/9/2023 25-65 25 Normandy Road Private Single Family Medium-Density Residential Infiltration Chamber (1S) 1.02 0.07 -- B 733 0.14 0.14 - - -47 2/4/2023 33-237 24 Wachusett Drive Private Single Family Medium-Density Residential Infiltration Chamber (1S) 2.410.09 -- A 730 0.17 0.17 - - -42452.41AA0.170.130.1310/12/2022 8-57 21 Crescent Road Private Single Family Medium-Density Residential407/25/2023 50-110 20 Welch Road Private Single Family High Density Residential3/5/2023 4-41 130 Concord Avenue Private Single Family Medium-Density Residential31 1/18/2018 34-41A 55 Cary Ave Single Family Medium-Density ResidentialSingle Family12 Brookside Ave24-938/5/20152335High Density ResidentialCondos High Density Residential8.5936 5/14/1986 33-273 24 Valleyfield St Subdivision34 10-8-1 430 Concord Ave Assisted Living12/12/201833 12/15/2008 26-44F Journeys End Ln PrivatePrivatePrivate29 7/28/2006 34-50 17 Cary Ave Single Family Low-Density ResidentialMedium-Density ResidentialSingle Family2 Brookside Ave2524Medium-Density ResidentialSingle Family114 Marrett Rd31-5111/16/201014 Middle St32 3/30/2009 33-264A 341 Marrett Rd Condos High Density Residential24-952/25/20142621Low-Density Residential1/4/2016 23-19 10 Churchill Ln Single Family Medium-Density ResidentialResidential PropertiesPrivatePrivate1.520.030.120.070.130.071.313.144.5817.250.0730 12/2/2008 Single Family Medium-Density Residential0.252/8/2005Single Family Medium-Density ResidentialPrivatePrivaePrivatePrivatePrivatePrivate11/19/2013 34-57Medium-Density ResidentialCondosGrey Oaks Cir35-3A5/24/2016PrivatePrivate23.09 MultipleHigh Density ResidentialApartments1000 Main Campus Dr1-33 of 4 48 1/18/2023 11-25 4 Old Shade Street Private Single Family Low-Density Residential Infiltration Chamber (1S) 1.020.04 0.07 B 385 0.06 0.06 - - -49 12/2/2022 34-88 90 Middle Street Private Single FamilyMedium-Density Residential Infiltration Chamber 0.27 0.04-- C 577 0.07 0.07 - - -50 11/3/2022 24-81 4 Stedman Road Private Single Family Low-Density Residential Infiltration Chamber 2.41 0.05 -- A 261 0.08 0.08 - - -51 10/26/2022 43-6F 7 Elena Road Private Single Family Low-Density Residential Infiltration Chamber 2.41 0.07 -- A 5810.11 0.11 - - -52 10/24/2022 4-3 226 Concord Avenue Private Single Family Medium-Density Residential Infiltration Chamber 2.41 0.05 -- A 413 0.09 0.09 - - -53 10/24/2022 4-4 222 Concord Avenue Private Single Family Medium-Density Residential Infiltration Chamber 2.41 0.05 -- A 413 0.09 0.09 - - -54 10/20/2022 4-5 216 Concord Avenue Private Single Family Medium-Density Residential Infiltration Chamber 2.41 0.06 -- A 537 0.12 0.12 - - -55 10/3/2022 9-85A 141 Pleasant Street Private Single Family Medium-Density Residential Infiltration Chamber 2.41 0.10 -- A 714 0.19 0.19 - - -Infiltration Chamber (IS-1) 0.08 -- 1,316 0.15 - - -Infiltration Chamber (IS-2) 0.02 -- 396 0.04 - - -57 6/15/2022 4-7 206 Concord Avenue Private Single Family Medium-Density Residential Infiltration Chamber 2.41 0.05 --A 507 0.10 0.10 - - -58 4/28/2022 33-30 40 Bridge Street Private Single FamilyMedium-Density Residential Infiltration Chamber 1.02 0.06-- B 537 0.12 0.12 - - -59 4/28/2022 50-88A 49 Grandview Avenue Private Single Family Medium-Density Residential Infiltration Chamber 2.41 0.08 -- A 795 0.16 0.16 - - -60 4/21/2022 43-3 12 Barrymeade Drive Private Single FamilyLow-Density Residential Infiltration Chamber 0.17 0.08 -- C/D 1,023 0.12 0.12 - - -Infiltration Chambers (1) 2.41 0.03 -- A 435 0.05 0.05 - - -Infiltration Chambers (2) 2.41 0.04 -- A 278 0.07 0.07 - - -62 4/12/2022 2-1E 13 Cart Path Lane Private Single FamilyLow-Density Residential Infiltration Chambers 2.41 0.08 --A 755 0.12 0.12 - - -Infiltration Chambers 1.02 0.08 -- B 1,181 0.16 - - -Inf. Porous Paver (Patio) 1.02 0.01 -- B 317 0.01 - - -Inf. Porous Paver (Drive) 1.02 0.04 -- B 539 0.06 - - -Infiltration Chamber (System 1) 0.17 0.03 -- C/D 491 0.06 - --Infiltration Chamber (System 2) 0.17 0.02 -- C/D 350 0.04 - --Residential Total Credit (lbs/year) 51.24Location Plan Date Municipal/Private Facility Land Use BMP TypeSoil Infiltration Rate (in/hr)BMP Storage Volume (cf)Reduction (lbs/year)Total Property Reduction (lbs/year)BMP ID (MGT#)2022 BMP Field Verification? (Y/N)If N, why?18/19/2022MunicipalN/AResidentialInfiltration Trench-1800.630.63---28/19/2022MunicipalN/AResidentialInfiltration Trench-5041.591.59---38/19/2022MunicipalN/AResidentialInfiltration Trench-5000.910.91---48/19/2022MunicipalN/AResidentialInfiltration Trench-2400.610.61---56/15/2022MunicipalN/AResidentialInfiltration Trench-4320.610.61---66/15/2022MunicipalN/AResidentialInfiltration Trench-1440.240.24---7Email 6/7/25MunicipalN/ALow-Density ResidentialInfiltration CB & Trench0.170.06HSG C820.050.05---Municipal Roadway Total Credit (lbs/year)4.63Residential Total Credit (lbs/year) 51.24Non-Residential Total Credit (lbs/year) 52.67Total Credit (lbs/year) 108.54566463610.230.100.17 D 0.202/18/2022 23-12 65 Locust Avenue Private Single Family Medium-Density Residential2/10/2022 42-86 2 Leroy Road Private Single Family Medium-Density Residential23-7 5 Cedarwood Terrace Private Single Family Medium-Density Residential4/20/2022 8-124 34 Philip Road Private Single Family Medium-Density ResidentialLincoln St (near 357 Lincoln)3 Chadbourne Road9 Chadbourne Road11 Scott Road272 Concord Ave0.490.360.610.52Municipal RoadwaysAddress/Road178 Concord Ave2 Hampton RoadDrainage Area / Impervious Area Removal (AC)0.531.198/27/20224 of 4 5' HMA S W REM PVMT PROP LOAM & SEED REM CB PROP CB-1 W/ F&C RIM = 218.91' INV IN (GI-1) = 215.78' INV IN (6" DRAIN) = 216.75' (EX) INV OUT = 215.68' R&D EX CURB LINC O L N S T R E E T WEST O N S T R E E T PHEASANT LANE R&R SLATE WALKR&R POST TRIM OR REMOVE TREE TO IMPROVE SIGHT DISTANCE PROP HMA CURB TYPE 2 MID D L E S T R E E T CW SL 6 " D B Y LCW6" DB Y L S L CWCWR1-1 R&R STOP SIGN & STREET NAME SIGNS 5.5' H M A S W STA 101+52.27 LIMIT OF WORK N 2983829.4251 E 721485.0022 REM PAVEMENT PROP LOAM & SEED PROP HMA DWY PROP HMA DWY PROP HMA CURB TYPE 2 PROP HMA CURB TYPE 2 PROP HMA DWY REM PVMT PROP LOAM & SEED PROP CEM CONC PED RAMP PROP CEM CONC PED RAMP PROP CEM CONC PED RAMP PROP CEM CONC PED RAMP PROP CEM CONC PED RAMP (TYP) NARROW SIDEWALK TO 5' WIDE AT UTILITY POLE RET UP PROP HMA SW AT DRIVEWAY RET SHRUBS AS FEASIBLE (TYP) MAINTAIN 5' CLEARANCE IN SW FROM UP RET UP R&R MB 5' H M A S W PROP HMA WALK PROP HMA SW AT DRIVEWAY MAINTAIN 5' CLEARANCE IN SW FROM UP RET UP RET FENCE PROP 2.5' LOAM & SEED REM CURB PROP LOAM & SEED PROP CC SW PROP CC SW RET CB PROP 2.5' LOAM & SEED PROP 2.5' LOAM & SEED PROP CC WALK 6" DBY L 6" DBYL MEET & MATCH EX SW & BERM (+71) PROP GI-1 W/ 3' 12" RCP RIM = 218.36' INV OUT = 215.86' REM CB PROP CB-2 W/ F&C PROP 2.5'± FULL DEPTH PAVEMENT WIDENING RET STONE WALL (TYP) ADJ R&R STOP SIGN R&R MB R&R MB REM PAVEMENT PROP LOAM & SEED 24' REM EX DBYL RESTRIPE DBYL TO PROVIDE 10' MIN LANE WIDTH R=25' R=25' R=25' R&R MB W11-2 (2) W16-7pL W16-7pR W11-2 (2) W16-7pL W16-7pR W11-2 (2) W16-7pL W16-7pR W11-2 (2) W16-7pL W16-7pR 1 2 3 4 5 6 7 15 1 2 3 4 15 BOS RET PROP GI-2 W/ 3' 12" RCP PROP HMA TRANS CURB PROP 6' HMA TRANS CURB REM EX DBYL PROP LOAM & SEED PROP AGED PINE BARK MULCH AROUND SHRUBS RET PROP TREE & PLANT PROTECTION FENCE PROP TREE & PLANT PROTECTION FENCE PROP TREE & PLANT PROTECTION FENCE SAWC U T RET HYDRANT 10 1 10 2 103 104 105 106PC +1 9 .7 1 PC + 5 6 . 0 5 PC +23 . 1 1 PT + 5 2 . 3 1 PT +34 . 3 810 0+50 21 PC +24.35 PT + 7 8 . 8 020+0021+ 5 041+0011 PC +1 9. 5 2 PT +43.35 PRC +20.46 10+00 11+69.31S85 ° 3 0 ' 1 6 "E 69 . 71 ' N59° 5 7 ' 4 6 " E 103. 7 4 ' N19°05' 3 0 " E 88.73' Δ=3 4 ° 3 1 ' 5 8 " R=220.00' L= 1 3 2 . 6 0 ' T= 6 8 . 3 8 ' Δ=40°52'15" R=250.00' L=178.33' T=93.15' N15°11'07"E 19.52' N10°22'42"W 25.95' Δ =7°13' 4 5 " R =8 0 0 .0 0 'L=100 . 9 4' T=50.5 4' Δ=32°47'34" R=40.00' L=22.89' T=11.77' S66°43'57"E 24.35' N61 ° 1 6 ' 1 7 " E 71.2 0 ' Δ=51°59'46" R=60.00' L=54.45' T=29.26' PROP HMA CURB TYPE 3 PROP HMA CURB TYPE 2 101+76.82 LINCOLN STREET= 11+69.31 WESTON STREET 105+16.16 LINCOLN STREET= 20+00.00 MIDDLE STREET MEET EX BERM +50.77 PROP 6' HMA TRANS CURB MEET EX +00 MEET & MATCH EX BERM (+64) PROP 5.5' HMA SW/DWY STA 102+37 TO STA 102+67 +5716.5'11.0'PLUG IN STRUCTURE & ABAN PIPE PROP 45 LF 12" RCP 20 SCALE: 1" = 20' 0 50 100N Drawing Copyright © 2022 Checked By: Drawing No.: IT IS A VIOLATION OF LAW FOR ANYPERSON, UNLESS THEY ARE ACTINGUNDER THE DIRECTION OF A LICENSEDPROFESSIONAL ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR TO ALTER AN ITEM IN ANYWAY. IF AN ITEM BEARING THE STAMP OFA LICENSED PROFESSIONAL IS ALTERED,THE ALTERING ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR SHALL STAMP THEDOCUMENT AND INCLUDE THE NOTATION"ALTERED BY" FOLLOWED BY THEIRSIGNATURE, THE DATE OF SUCHALTERATION, AND A SPECIFICDESCRIPTION OF THE ALTERATION. Issue Date: Designed By:Drawn By: Project No:Scale: No.By DateSubmittal / Revision TOWN OF LEXINGTON, MASSACHUSETTS HIGHWAY DEPARTMENT LINCOLN STREET SIDEWALK PROJECT 71414 App'd. 06-14-2022 OF 20 DC/JB JGM 141 Longwater Drive - Suite 104 Norwell, MA 02061781.982.5400 www.chacompanies.com DC/JB 2 CONCEPT - REV 1 01/05/22 1 CONCEPT 10/22/21 3 PRELIM 03/02/22 4 PRELIM - REV 1 03/09/22 5 FINAL 06/02/22 6 FINAL REV 1 06/14/22 3 CONSTRUCTION PLANS - 1 1" = 20'CONTINUED ONSHEET NO 4# # SEE SHEETS 17 & 18 FOR DRIVEWAY DETAILS SEE SHEETS 16 & 17 FOR PCR DETAILS 6/14/22 5.5' HMA SW PROP LOAM & SEED R&R MB RET BERM PROP 2.5' LOAM & SEED (TYP) RET COBBLES LINCOLN ST R E E TPHEASANT LANEPROP LOAM & SEED TO STONE WALL (TYP) PROP 6' HMA TRANS CURB R&R MB RET UP RESET FALLEN STONES BACK INTO STONE WALL (TYP) EXTEND SW TO FACE OF WALL PROP AGED PINE BARK MULCH TO STONE WALL (TYP) PROP LOAM & SEED TO STONE WALL (TYP) RET & PROTECT TREES (TYP) REMOVE PAVEMENT PROP LOAM & SEED (TYP) PROP HMA CURB TYPE 2 CWPROP HMA SW AT DWY PROP LOAM & SEED TO STONE WALL (TYP) PROP HMA SW AT DWY PROP HMA DWY PROP HMA DWY PROP 6.5' LOAM & SEED RET CB CWC W R&R SLATE WALK PROP 5' HMA SW PROP CEM CONC PED RAMP 5' HMA SW HMA CURB TYPE 3 PROP CEM CONC PED RAMP R&R SIGN MI D D L E S T R E E T REM EXIST CB, R&S F&G PROP CB-1 W/ F&C RIM = 218.91' INV IN (GI-1) = 215.78' INV IN (6" DRAIN) = 216.75' (EX) INV OUT = 215.68' REM EX PIPE REM EXIST PIPE PROP 2.5'± FULL DEPTH PAVEMENT WIDENING MEET & MATCH EX SW PLUG IN STRUCTURE & ABAN PIPE 6" DBYL R&R SIGNS PROP HMA CURB TYPE 2 PROP CC SW REM PVMT PROP 4.5' LOAM & SEED 5.5' HMA S W ADJ CB & REMOVE DRAINAGE STRUCTURE SEDIMENT INV IN (CB-2) = 215.21' RET R=15' R=15' W11-2 (2) W16-7pL W16-7pR W11-2 (2) W16-7pL W16-7pR W11-2 (2) W16-7pL W16-7pR 8 9 10 11 12 5 6 LIMIT OF GRADING (TYP)BOS BOS TOS T O S PROP 3 LF 12" RCP PROP GI-1 RIM = 218.36' INV OUT = 215.86' REM EX DBYL RESTRIPE DBYL TO PROVIDE 10' MIN LANE WIDTH PROP 45 LF 12" RCP RET REM EXIST CB, R&S F&G PROP CB-2 W/ F&C RIM = 219.07' INV IN (CB-1) = 215.44' INV IN (GI-2) = 215.90' INV OUT = 215.34'PROP 23 LF 12" RCP PROP 3 LF 12" RCP PROP GI-2 RIM = 218.50' INV OUT = 216.00' ADJ R&R BOUND ADJ EHH (BO) PROP SAWCUT 30+00106 107 108 109 110 111 11 2 PC +23.11 PC +02.44 PT +04.62 2 1 + 5 0 40+0041+00N11°18'29"E 197.82' Δ=7°47'01" R =6 0 0.0 0 ' L=81.51' T=40.82' Δ=6 6 ° 4 1 ' 3 8 " R=380.00' L= 4 4 2 . 3 3 ' T= 2 5 0 . 0 6 ' N 6 1 ° 1 6 ' 1 7 " E 7 1 . 2 0 'N71°42'53"W100.00'W11-2 (2) W16-7pL W16-7pR PROP HMA CURB TYPE 2 106+77.38 LINCOLN STREET= 40+00.00 PHEASANT LANE MEET & MATCH EX BERM +64.70 MEET & MATCH EX CURB +31.48 MEET & MATCH EX CURB +44.52 RET PROP 6' HMA TRANS MEET EX BERM 20 SCALE: 1" = 20' 0 50 100N Drawing Copyright © 2022 Checked By: Drawing No.: IT IS A VIOLATION OF LAW FOR ANYPERSON, UNLESS THEY ARE ACTINGUNDER THE DIRECTION OF A LICENSEDPROFESSIONAL ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR TO ALTER AN ITEM IN ANYWAY. IF AN ITEM BEARING THE STAMP OFA LICENSED PROFESSIONAL IS ALTERED,THE ALTERING ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR SHALL STAMP THEDOCUMENT AND INCLUDE THE NOTATION"ALTERED BY" FOLLOWED BY THEIRSIGNATURE, THE DATE OF SUCHALTERATION, AND A SPECIFICDESCRIPTION OF THE ALTERATION. Issue Date: Designed By:Drawn By: Project No:Scale: No.By DateSubmittal / Revision TOWN OF LEXINGTON, MASSACHUSETTS HIGHWAY DEPARTMENT LINCOLN STREET SIDEWALK PROJECT 71414 App'd. 06-14-2022 OF 20 DC/JB JGM 141 Longwater Drive - Suite 104 Norwell, MA 02061781.982.5400 www.chacompanies.com DC/JB 2 CONCEPT - REV 1 01/05/22 1 CONCEPT 10/22/21 3 PRELIM 03/02/22 4 PRELIM - REV 1 03/09/22 5 FINAL 06/02/22 6 FINAL REV 1 06/14/22 4 CONSTRUCTION PLANS - 2 1" = 20'CONTINUED ONSHEET NO 3CONTINUED ONSHEET NO 5# # SEE SHEETS 17 & 18 FOR DRIVEWAY DETAILS SEE SHEETS 16 & 17 FOR PCR DETAILS 6/14/22 PROP HMA CURB TYPE 2 R&R MB R&R LOOSE STONE WALLTO BACK OF SW (TYP) LINCOLN STREETBIRCH H ILL LANE ADJ EHH (BO) RET UP MAINTAIN 4.7' CLEARANCE FROM EDGE OF POLE TO FACE OF CURB PROP LOAM & SEED TO STONE WALL (TYP) R&D SIGN RET STONE WALL CWCW PROP HMA CURB TYPE 2 (TYP) SL R&D SIGN EXCAVATE WITH CAUTION MAKE EFFORT TO RETAIN TREE R&R LOOSE STONE WALL TO BACK OF SW (TYP) REM STUMP R1-1 PROP HMA DWY PROP CEM CONC PED RAMP MEET & MATCH EX SW 5.5' HMA S W PROP GRANITE CURB CORNER TYPE A 5.5' HMA SW 5.5' HMA SW HMA CURB T Y P E 2 5.5' HMA SW HMA CURB TYPE 2 REM TREE REM TREE 5' HMA SW 6' HMA TRANS FROM CURB TO BERM 6' HMA TRANS FROM CURB TO BERM PROP LOAM & SEED RET TREE RET TREE MAINTAIN DRIVEWAY ACCESS PROP HMA BERM TYPE A MODIFIED (12" WIDE - SEE SHEET 13 FOR DETAIL) RET TREERET TREE PROP LOAM & SEED 5' HMA SW R=15' R=15' R&R LOOSE STONE WALL TO BACK OF SW (TYP) W11-2 (2) W16-7pL W16-7pR W11-2 (2) W16-7pL W16-7pR 10 11 12 13 7 16 LIMIT OF GRADING (TYP) TOS TOS TOS TOS PROP SEDIMENTATION FENCE & COMPOST SOCK RET HYD REM PVMT PROP LOAM & SEED REM PVMT PROP LOAM & SEED ADJ R&R BOUND RET RET RET RET TREES (TYP) PROP TREE PROTECTION FENCE30+0031+00112 113 114 115 116 117 PT +44.77 N78°00'07"E 734.80' Δ =66° 4 1' 3 8" R =3 8 0 .0 0 'L=44 2. 3 3' T=25 0. 0 6'N32°01'32 "W100.00 ' PROP 4' DIAMETER LEACHING BASIN W/ OFFSET TOP R=242.07 INV OUT=239.57 PROP 60 LF 6" PERFORATED PIPE OVER 12" OF 1" TO 1-1/2" DOUBLE WASHED STONE RET INV IN=236.81 20 SCALE: 1" = 20' 0 50 100 N Drawing Copyright © 2022 Checked By: Drawing No.: IT IS A VIOLATION OF LAW FOR ANYPERSON, UNLESS THEY ARE ACTINGUNDER THE DIRECTION OF A LICENSEDPROFESSIONAL ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR TO ALTER AN ITEM IN ANYWAY. IF AN ITEM BEARING THE STAMP OFA LICENSED PROFESSIONAL IS ALTERED,THE ALTERING ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR SHALL STAMP THEDOCUMENT AND INCLUDE THE NOTATION"ALTERED BY" FOLLOWED BY THEIRSIGNATURE, THE DATE OF SUCHALTERATION, AND A SPECIFICDESCRIPTION OF THE ALTERATION. Issue Date: Designed By:Drawn By: Project No:Scale: No.By DateSubmittal / Revision TOWN OF LEXINGTON, MASSACHUSETTS HIGHWAY DEPARTMENT LINCOLN STREET SIDEWALK PROJECT 71414 App'd. 03-14-2022 OF 19 DC/JB JGM 141 Longwater Drive - Suite 104 Norwell, MA 02061781.982.5400 www.chacompanies.com DC/JB 2 CONCEPT - REV 1 01/05/22 1 CONCEPT 10/22/21 3 PRELIM 03/02/22 4 PRELIM - REV 1 03/09/22 5 CONSTRUCTION PLANS - 3 1" = 20'CONTINUED ONSHEET NO 4CONTINUED ONSHEET NO 6# # SEE SHEETS 16 & 17 FOR DRIVEWAY DETAILS SEE SHEETS 15 & 16 FOR PCR DETAILS PROP HMA CURB TYPE 2 (TYP) 5.5' HMA SW REM EXIST DWY PROP LOAM & SEED ADJ LINCOLN STREET RET TREE PROP HMA CURB TYPE 2 (TYP) REM PATH PROP VIBURNUM - ARROWWOOD 3-4 FEET, 3 EA, SPACED AT 6' ON CENTER RET UP RET STA 119+00 TO STA 121+50 PITCH SW AWAY FROM ROAD TO MAINTAIN POSITIVE DRAINAGE OFF OF ROADWAY R&R MB PROP HMA DWY PROP HMA DWYRETR&R BRICKS FLUSH AT BACK OF SW RET MBBARRYMEADE DR IVE RET TIMBER EXCEPT THROUGH PROP SW 5.5' HMA SW 5' HM A S W PROP HMA SW AT DWY RET PROP HMA DWY APRON EXPAND IDYLWILDE PARKING LOT APPROX. DIMENSIONS 36' x 150' REM TREES PROP GRAVEL DRIVEWAY GRADING TO BE DETERMINED IN THE FIELD BY THE ENGINEER REM DEAD TREES4'RET TREES (TYP) REMOVE BOULDERS IN SIDEWALK AND PARKING LOT AREA TO SURROUND NEW PARKING LOT AS DIRECTED BY THE ENGINEER (TYP) R&R IDYLWILDE CONSERVATION AREA SIGN FOR IMPROVED SIGHT DISTANCE FROM PARKING LOT 5' HMA SW RET TREES (TYP) 18' PROP 6' HMA TRANS CURB PROP 6' HMA TRANS CURB PROP LOAM & SEED RET TREE R&S TRAIL SIGNS DROP OFF SIGNS AT LEXINGTON HIGHWAY DEPT 8 9 10 PROP CRUSHED STONE PROP 6" CRUSHED STONE PAD FOR EROSION CONTROL LIMIT OF GRADING (TYP) TOS BOS TOS TOS PROP SEDIMENTATION FENCE & COMPOST SOCK RET RET REM TREE PROP 6' HMA TRANS CURB R&S TRAIL SIGNS DROP OFF SIGNS AT LEXINGTON HIGHWAY DEPT PROP AGED PINE BARK MULCH PROP LOAM & SEED PROP TREE PROTECTION FENCE 5.5' HMA SW PROP TREE PROTECTION FENCE PROP TREE & PLANT PROTECTION FENCE PROP TREE & PLANT PROTECTION FENCE PROP SIDEWALK EASEMENT AREA = 453 SF PROP SIDEWALK EASEMENT AREA = 769 SF 117 118 119 120 121 122 123 PC +79.58 PT + 9 6. 1 1 N78°00'07"E 734.80' Δ =41°21' 1 9 " R =3 0 0 .0 0 'L=216 . 5 4' T=113 . 2 3' PROP 4' DIAMETER LEACHING BASIN W/ OFFSET TOP R=247.09 20 SCALE: 1" = 20' 0 50 100 N Drawing Copyright © 2022 Checked By: Drawing No.: IT IS A VIOLATION OF LAW FOR ANYPERSON, UNLESS THEY ARE ACTINGUNDER THE DIRECTION OF A LICENSEDPROFESSIONAL ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR TO ALTER AN ITEM IN ANYWAY. IF AN ITEM BEARING THE STAMP OFA LICENSED PROFESSIONAL IS ALTERED,THE ALTERING ENGINEER, ARCHITECT,LANDSCAPE ARCHITECT OR LANDSURVEYOR SHALL STAMP THEDOCUMENT AND INCLUDE THE NOTATION"ALTERED BY" FOLLOWED BY THEIRSIGNATURE, THE DATE OF SUCHALTERATION, AND A SPECIFICDESCRIPTION OF THE ALTERATION. Issue Date: Designed By:Drawn By: Project No:Scale: No.By DateSubmittal / Revision TOWN OF LEXINGTON, MASSACHUSETTS HIGHWAY DEPARTMENT LINCOLN STREET SIDEWALK PROJECT 71414 App'd. 03-14-2022 OF 19 DC/JB JGM 141 Longwater Drive - Suite 104 Norwell, MA 02061781.982.5400 www.chacompanies.com DC/JB 2 CONCEPT - REV 1 01/05/22 1 CONCEPT 10/22/21 3 PRELIM 03/02/22 4 PRELIM - REV 1 03/09/22 6 CONSTRUCTION PLANS - 4 1" = 20'CONTINUED ONSHEET NO 5CONTINUED ONSHEET NO 7# # SEE SHEETS 16 & 17 FOR DRIVEWAY DETAILS SEE SHEETS 15 & 16 FOR PCR DETAILS N S EW STREET TRENCH SHEET 2022 PAVING AS-BUILTS.DWG27-Sep-2022 12:50 PMPlotted on N S EW STREET TRENCH SHEET 2023 FINAL.DWG15-Aug-2023 3:05 PMPlotted on Attachment 6: O&M Program Documentation Permit Year 6 BMP Inventory Memorandum (Environmental Partners) Strategic Stormwater Communication and Outreach Plan May 29, 2024 Marc Valenti Director of Operations Lexington Department of Public Works 201 Bedford Street Lexington, MA 02420 RE: MS4 General Permit Assistance for the Lexington Department of Public Works Year 6 Municipal Stormwater BMP Inspections and Inventory Dear Mr. Valenti, On April 13, 2016, the Environmental Protection Agency (EPA) released the General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems (MS4s) in Massachusetts, which became effective July 1, 2018. The Permit imposes a host of new requirements for the Town of Lexington and all communities under its jurisdiction. To address the Permit requirements (Section 2.3.7.a.iii.6) for the stormwater treatment structure inspections, Environmental Partners Group, LLC (EP) visited 170 of the Town’s 191 stormwater treatment best management practices (BMPs) to provide structure condition data and to improve the Town’s BMP inventory. EP did not visit any of the 21, private, non-school BMPs. During the time of inspections, two (2) additional stormwater BMPs were found and added to the Town’s BMP Inventory. As such, the new total count for stormwater BMPs is 172 for municipal jurisdiction, and 193 including the private, non-school BMPs. EP staff conducted site visits and inspections of the 172 BMPs in April 2024 and were performed during dry weather. Stormwater BMPs throughout the town and Charles River Watershed were inspected during this time. All BMPs visited are shown in Figure 1: Stormwater BMP Inspection Locations and listed in Table 1: Stormwater BMP Inventory, which also includes information about inventory notes and mapping updates recommended. Similar to last fiscal year, EP recommends removing four (4) BMP locations from the Town’s inventory due to private ownership, connection to sanitary sewer system, and non-existence and based on field observations and reviewed site plans. This fiscal year, EP added two (2) BMP to the Charles River Watershed inventory. Recommendations for further improving the Town’s BMP inventory and any changes made are further detailed in Table 1. Lastly, inspections were completed in PeopleGIS account using QA-Editor tools. Structure condition and maintenance issues were noted. Refer to the PeopleGIS inspection forms to view field visit Page 2 of 2 envpartners.com photos and notes. Inspection findings and maintenance recommendations are summarized in Table 2: Lexington Schools BMP Maintenance Items, Table 3: Non-School BMP Maintenance Items and Table 4: Charles River Watershed BMP Maintenance Items. In general, minor to moderate maintenance issues were observed, that include, but are not limited to: •Excess growth of vegetation, leaf litter buildup, and other dead vegetation, •Garbage and debris, •Buildup of sediment causing pooling at BMP inlets, •Rip rap needing sediment removal and/or stone material refreshed, •Areas requiring re-grading, •Inlets/outlets that were partially clogged with debris and/or sediment, and •Assets being inaccessible during the time of inspections either due to limited access or being buried under grass. We very much appreciate the opportunity to work with the Town of Lexington on this project. Please don’t hesitate to contact us if you have any questions or require additional information. Sincerely, Environmental Partners Group, LLC Natalie M. Pommersheim Project Manager and Associate O: 617.657.0257 E: nmp@envpartners.com CC John Zaccari – Lexington DPW Marissa Liggiero – Lexington Engineering Division Eric Kelley, P.E., CHMM, LEED GA – Environmental Partners Karen Chan – Environmental Partners Attachments MS4 Certification Page Figure 1: Stormwater BMP Inspection Locations Table 1: Town of Lexington Stormwater BMP Inventory Table 2: Lexington School BMP Maintenance Items Table 3: Lexington Non-school BMP Maintenance Items Table 4: Lexington Charles River Watershed BMP Maintenance Items envpartners.com MS4 CERTIFICATION PAGE CERTIFICATION “I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.” Printed Name ___________________________________________ Signature ________________________________________________ Date _________________________________________ envpartners.com FIGURE 1 Stormwater BMP Inspection Locations 0 1 20.5 Miles May 2024 Lexington, MA Stormwater BMP Inspection LocationsFigure 1 HANSCOM AFB 4 E l m B r oo k M ill St S o ut hRdWi gg i nsAveKendallRdWorth e n R d G rantStC edarSt Mi d d l e sex TpkeGre a t Rd RussellS tHartwellAve WoodSt GroveS t Wal tha mSt EastStHa n cockSt128 2 4 3 95 Hanscom Air Force Base Mary PC Cummings Park Hayden Woods Arlington Great Meadow Willard's Woods Burlington Strip EAST LEXINGTON IDYLWIDE NORTH LEXINGTON FULLER HEIGHTS COUNTRYSIDE FOLLEN HEIGHTS SHAKER GLEN LEXINGTON Hobbs B rook Bas in Trapelo Rd WinterStWymanStLake St L i n c o l nStOldCountyR dLexingtonStWalthamStHayden A v e 2 Beaver Brook North Reservation Belmont Country Club SUTHERLAND WOODS Lit tl es B rook Lex in g t o n StRev e re R d R u s s e llS t2A Whipple Hill A p p le to nSt ConcordTpkeParkAveStormwater BMPs Inspected Not Inspected (Private) Retired Charles River Watershed envpartners.com TABLE 1 Stormwater BMP Inventory Town of Lexington Table 1: Stormwater BMP Inventory May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Inventory Notes Mapping/Other Notes Maintenance Notes 3 Aaron Road MGT108 6 Aaron Road MGT109 12 Boxwood Lane MGT116 Infiltration Infiltration Trench See Table 3 Bridge Elementary School MGT124 Sediment Separator Contech No maintenance needed MGT123 Other Vegetated Filter Strip See Table 4 MGT175 Sediment Separator Contech No maintenance needed MGT121 Below-Grade Storage MGT122 Below-Grade Storage MGT144 Infiltration Subsurface Infiltration Unit No immediate maintenance needed MGT145 Infiltration Removed MGT145 was a duplicate point of MGT144 and has been retired PeoplesGIS. MGT146 Infiltration MGT147 Infiltration MGT148 Infiltration MGT149 Other Sediment Forebay MGT150 Other Sediment Forebay MGT162 Sediment Separator MGT163 Sediment Separator MGT164 Sediment Separator Hydroworks Hydroguard MGT165 Sediment Separator Hydroworks Hydroguard See Table 4 MGT166 Sediment Separator Hydroworks Hydrostorm MGT167 Sediment Separator Hydroworks Hydrostorm MGT168 Sediment Separator Hydroworks Hydrostorm MGT89 Unknown Bioretention Basin See Table 4 No immediate maintenance needed Bowman Elementary School Carey Memorial Library No immediate maintenance needed Dry Detention Clarke Middle School No immediate maintenance needed See Table 4 No immediate maintenance needed No immediate maintenance needed 1 of 7 Town of Lexington Table 1: Stormwater BMP Inventory May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Inventory Notes Mapping/Other Notes Maintenance Notes 13 Cider Mill Lane MGT209 Sediment Separator oil/grit separator Cider Mill Lane MGT107 Infiltration MGT154 Infiltration No immediate maintenance needed MGT156 Sediment Separator Hydroworks Hydroguard MGT157 Sediment Separator MGT158 Sediment Separator Hydroworks Hydroguard MGT159 Sediment Separator MGT160 Sediment Separator Hydroworks Hydroguard MGT161 Sediment Separator MGT48 Infiltration StormTech MGT80 Infiltration Bioretention Basin MGT81 Sediment MGT85 Other Drain outlet No immediate maintenance needed MGT86 Other Drain outlet MGT87 Unknown Bioretention Basin MGT88 Other Drain outlet MGT1 Below-Grade Storage Infiltration Chamber MGT100 Other Secondary ForebayMGT101OtherPrimary Forebay MGT102 Other Dome Field Inlet Recommend combining MGT13 with MGT102 as the two points are part of the MGT11 Filter Combine Recommend combining MGT11 with MGT96 as the two points are part of the MGT12 Filter Combine Recommend combining MGT12 with MGT98 as the two points are part of the MGT13 Filter Combine Recommend combining MGT13 with MGT102 as the two points are part of the MGT14 Dry Detention Wetland MGT15 Infiltration Porous Pavement MGT16 Infiltration Porous Pavement MGT17 Infiltration Porous Pavement MGT18 Infiltration Porous Pavement See Table 2 See Table 2 No immediate maintenance neededDPW See Table 3 See Table 3 Diamond Middle School See Table 3 2 of 7 Town of Lexington Table 1: Stormwater BMP Inventory May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Inventory Notes Mapping/Other Notes Maintenance Notes MGT19 Water Quality Swale MGT195 Sediment Separator Hydro International MGT194 was a duplicate BMP point and has been retired in PeoplesGIS.MGT2 Below-Grade Infiltration ChamberMGT3Below-Grade Infiltration ChamberMGT4Below-Grade Infiltration ChamberMGT5Below-Grade Infiltration ChamberMGT6Below-Grade Infiltration ChamberMGT7SedimentSedimentation ChamberMGT8FilterGreen Roof MGT9 Filter Combine Recommend combining MGT9 with MGT97 as the two points are part of the same BMP. MGT94 Water Quality Swale MGT95 Other Oil and Grease Trap Remove Part of sanitary sewer system. MGT96 Other Dome Field Inlet Combine Recommend combining MGT11 with MGT96 as the two points are part of the MGT97 Other Bioretention Basin Cleanout Combine Recommend combining MGT9 with MGT97 as the two points are part of the same BMP. No immediate maintenance needed MGT98 Other Dome Field Inlet Combine Recommend combining MGT12 with MGT98 as the two points are part of the MGT99 Other Stand Pipe 71 East Street MGT106 Infiltration No immediate maintenance needed See Table 3 DPW See Table 3 3 of 7 Town of Lexington Table 1: Stormwater BMP Inventory May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Inventory Notes Mapping/Other Notes Maintenance Notes MGT128 Sediment Separator Hydro International First Defense Unit No immediate maintenance needed MGT129 Dry Detention MGT130 Dry Detention MGT131 Sediment forebay MGT132 Other Sediment forebay MGT133 Dry Detention MGT134 Other Sediment Forebay No immediate maintenance needed MGT135 Dry Detention See Table 2 MGT136 Other Sediment Forebay MGT137 Dry Detention MGT191 Sediment Separator MGT193 Dry Detention MGT78 Remove BMP may not exist and is within the same BMP as MGT135. MGT79 Sediment Separator Overflow outfall should be mapped. MGT196 Other Porous Pavement MGT197 was a duplicate point of MGT196 and has been retired PeoplesGIS.MGT198 Other Sediment Forebay MGT199 Other Bioretention Basin MGT200 Other Sediment Forebay MGT201 Other Porous PavementMGT202OtherSediment ForebayMGT203OtherBioretention BasinMGT204OtherSediment Forebay MGT205 Other Bioretention Basin MGT206 Other Subsurface Infiltration MGT207 Other Subsurface Infiltration System See Table 3 Estabrook Elementary School See Table 2 Fire Department No immediate maintenance needed No immediate maintenance needed See Table 3 See Table 2 4 of 7 Town of Lexington Table 1: Stormwater BMP Inventory May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Inventory Notes Mapping/Other Notes Maintenance Notes MGT151 Infiltration Location updated MGT152 Infiltration MGT73 Infiltration 24" Perforated HDPE MGT74 Sediment Separator Vortech See Table 2 MGT75 Infiltration MGT76 Sediment Separator MGT77 Remove or combine This BMP should be removed / combined with MGT151.See Table 2 10 Fox Run Lane MGT103 Infiltration No immediate maintenance needed MGT61 Infiltration Moved MGT61 in PeoplesGIS to accurately reflect the BMPs correct locations. See Table 3 MGT62 Sediment Separator Moved MGT62 in PeoplesGIS to accurately reflect the BMPs correct locations. No maintenance needed MGT153 Infiltration See Table 2 MGT67 (retired) Infiltration (retired)Retired MGT68 Other MGT69 (retired) Other (retired)Retired MGT70 Infiltration Subsurface Infiltration Unit No maintenance needed MGT71 Infiltration MGT72 (retired) Infiltration (retired)Retired MGT182 Other Recharger No maintenance needed MGT184 Other Level Spreader MGT185 Other Level Spreader MGT186 Other Level Spreader MGT187 Other Stormwater Recharger No maintenance needed MGT188 Other Bioretention Basin MGT189 Other Bioretention Basin MGT190 Other Bioretention Basin MGT218 Other Porous Asphalt Added New BMP found and added during inspections. MGT219 Other Recharger Added Added during inspections, however, it appears that MGT183 is the actual BMP point for this unit, but in the wrong location. MGT220 Sediment Separator Contech Added New BMP found and added during inspections. MGT221 Sediment Separator Contech Added New BMP found and added during inspections. Fiske Elementary School 1 Granger Pond Way Harrington Elementary School Subsurface Infiltration Unit See Table 2; no immediate maintenance needed Subsurface Infiltration Unit See Table 2; no immediate maintenance needed No maintenance needed No immediate maintenance needed Hasting's Elementary School See Table 4 See Table 4 No maintenance needed 5 of 7 Town of Lexington Table 1: Stormwater BMP Inventory May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Inventory Notes Mapping/Other Notes Maintenance Notes MGT57 Other Settling Tank See Table 3 MGT58 Infiltration No immediate maintenance needed MGT59 Sediment Separator MGT60 Infiltration 5 Keller Farm Way MGT105 Infiltration MGT104 Infiltration MGT208 Sediment Separator Stormceptor 10 Keller Farm Way MGT211 Sediment Separator Stormceptor No immediate maintenance needed MGT125 Sediment Separator No maintenance needed MGT126 Sediment Separator MGT127 Below-Grade Storage MGT138 Other Porous Asphalt No immediate maintenance needed MGT139 Dry Detention MGT140 Infiltration MGT141 Dry Detention MGT142 Other Swale MGT143 Infiltration MGT169 Sediment Separator Contech MGT170 Sediment Separator Contech MGT171 Sediment Separator Contech No immediate maintenance needed MGT172 Sediment Separator Contech MGT173 Sediment Separator Contech MGT174 Sediment Separator No maintenance needed 5 Luongo Farm Lane MGT217 Sediment Separator Stormceptor Added BMP was added to inventory on 5/3/2023.See Table 3 7 Luongo Farm Lane MGT155 Other Subsurface Infiltration System 9 Luongo Farm Lane MGT210 Sediment Separator Stormceptor MGT51 Infiltration MGT52 Infiltration MGT53 Infiltration Munroe Center for the Arts MGT37 Dry Detention StormTech No immediate maintenance needed MGT118 Infiltration Bioinfiltration Basin MGT119 Infiltration Detention Pond MGT120 Filter Biofilter Basin Old Reservoir Parking lot MGT54 Filter Porous Asphalt Howard Munroe Place Johnson Farm Road See Table 3 3 Keller Farm Way Lexington High School See Table 2 Lexington Children's Place No immediate maintenance needed Minuteman Commuter Bikeway Parking Old Reservoir See Table 3 See Table 3 See Table 4 See Table 4 See Table 3 6 of 7 Town of Lexington Table 1: Stormwater BMP Inventory May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Inventory Notes Mapping/Other Notes Maintenance Notes MGT213 Infiltration MGT64 Sediment Separator Sedimentation Chamber 25 Robinson Road MGT39 Other Remove 33 Robinson Road MGT40 Other Remove 3 Smith Farm Lane MGT91 Infiltration No immediate maintenance needed 5 Smith Farm Lane MGT93 Infiltration No maintenance needed 5 Taylor Lane MGT63 Infiltration See Table 3 Tyler Road Intersection MGT117 Other Rock Swale No immediate maintenance needed MGT55 Other Settling Tank MGT56 Infiltration MGT20 Sediment Separator Sedimentation Chamber No immediate maintenance needed MGT21 Infiltration Infiltration Chamber See Table 3 MGT22 Sediment Separator Sedimentation Chamber MGT23 Infiltration Infiltration Chamber MGT212 Sediment Separator Sedimentation Chamber MGT92 Infiltration 6 Porter Lane See Table 3 See Table 3 9 Webb Street No immediate maintenance 3 Wisteria Lane 164 Wood Street See Table 3 No immediate maintenance needed 7 of 7 envpartners.com TABLE 2 Lexington Schools BMP Maintenance Items Town of Lexington Table 2: Lexington School BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description Bridge Elementary School MGT124 Sediment Separator Contech Contech unit - 4’ of standing water and 4" of sediment observed. Minimal floatables observed in contech structure. Inlet/outlet within contech structure is clear. Sediment does not exceed maintenance threshold. Unit in good condition. No immediate maintenance needed. MGT154 Infiltration Subsurface infiltration unit - The subsurface infiltration unit is functioning well. Clean out ports have minimal standing water and littler to no debris. Water level in outlet control structure is normal (below inlet pipe), indicating stormwater if flowing and infiltrating fine. No immediate maintenance needed. MGT156 Sediment Separator Hydroworks Hydroguard Hydrodynamic separator - Significant debris and sediment located at the inlet pipe. 6’ of standing water observed. Some floatables. Unit is overall in good condition. Routine maintenance such as cleaning is recommended. MGT157 Sediment Separator Hydroworks Hydroguard unit (likely HG4 model with 5’ sump) - 5’ of standing water measured. Little to no sediment observed at base of structure. Minimal amount of oil sheen. No floatables observed. Separator is overall functioning well and no immediate maintenance is required. MGT158 Sediment Separator Hydroworks Hydroguard Hydroworks Hydroguard unit (5’ sump, likely HG5 model) - A couple inches of sediment at base of structure, which is notable but less than threshold for maintenance. A few rocks and trash found in the structure and should be removed. Some floatable debris/trash but not exceeding threshold for maintenance. Outlet to basin is generally in good condition but riprap stones have some debris - debris should be cleared and stones reset. Inlet to separator from pavement contains some sediment that should be removed. Separator does not need maintenance but inlet and outlet need minor maintenance. MGT159 Sediment Separator Hydroworks Hydroguard unit - Inlet and outlet are in good condition. Sediment is observed at the flared end inlet pipe from the parking lot. Minor maintenance required. Water level in structure is below invert of outlet pipe. A couple inches of sediment observed which is notable but below the maintenance threshold. Minimal floatables Inlet to basin from separator is in good condition. Riprap contains only a minor amount of leaves. Aside from inlet from parking lot to separator, no immediate maintenance is needed. MGT160 Sediment Separator Hydroworks Hydroguard Hydroworks Hydroguard unit (HG5 model likely) - A few inches of sediment and some floatables observed, but lower than the 14" threshold, therefore, immediate maintenance is not required. Inlet from parking lot is clear. Outlet to basin is clear, but riprap contains some debris/leaves - minor maintenance needed. MGT161 Sediment Separator Hydroworks Hydroguard unit - Some sediment in structure, and observed to be below Hydroworks threshold for maintenance. 6' of standing water observed. Trash and leaves observed within structure. Inlet to structure requires cleaning of leaves and sediment. Outlet pipe to basin is in good condition, but riprap apron requires minor maintenance to clear riprap stones. Diamond Middle School 1 of 5 Town of Lexington Table 2: Lexington School BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT80 Infiltration Bioretention Basin Bioretention basin - Basin has layer of leaves and other dead vegetation which should be removed. Sedimentation is observed. Minor amount of trash observed. Inlet to structure has some sediment and should be cleared. No overflow outlet observed. MGT81 Sediment Separator Hydroworks Hydroguard unit - Trash and leaves observed. Inlet and outlet pipes within structure are in good condition. Sediment and leaves observed inside the flared end inlet pipe outside of the structure. Minor amount of trash found inside the unit. Maintenance such as cleaning for both the structure and inlet pipe outside of the structure is recommended. MGT85 Other Drain outlet Drain outlet - Inlet pipe is clear. Loose soil along slope of basin should be stabilized and reseeded as needed. Minor amount of leaves observed within riprap and should be cleared. Overall, basin is in good condition and no immediate maintenance is needed. MGT86 Other Drain outlet Drain outlet. Outlet is generally in good condition. Pipe is clear. Sedimentation is observed. Design drawings should be reviewed to confirm intended vegetation. Any excess vegetation should be removed and reseeded as designed. Reseed as needed. MGT87 Unknown Bioretention Basin Bioretention basin with under drain. Bottom of basin is soil - areas of soil need reseeding. Overall, basin has overgrowth and excess dead vegetation. Minor amount of trash noted. Outlet control structure has some leaf and debris buildup, but no immediate maintenance needed at the outlet. Routine maintenance such as removal of dead vegetation and reseeding the bottom of the basin (as needed) is recommended. MGT88 Other Drain outlet Drain outlet. Riprap at mouth of inlets have sediment and debris. Some leaves at mouth of one inlet. Minor amount of trash noted. Routine maintenance such as cleaing and removal of dead vegetation is recommended. Riprap should be refreshed/replenished as needed. Diamond Middle School 2 of 5 Town of Lexington Table 2: Lexington School BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT128 Sediment Separator Hydro International First Defense Unit Hydro International First Defense Unit (model FD4). Approximately 4" of sediment buildup. Minimal oils. Water depth is approximately 4'. Hydro recommends cleaning after 18” of sediment buildup. Clean in accordance with maintenance schedule. No immediate maintenance needed. MGT129 Dry Detention Sediment Forebay - minimal sediment and soil has built-up at start of forebay. Grass, leaves and minimal trash should be removed throughout forebay. Stone Filter Berm - overall in good condition, but leaves could be removed. Dry Detention Basin - confirm BMP type with landscape plan. Proposed plan calls structure “bioretention” but no plants aside from grass are growing. Minor amount of erosion observed on the slopes if the basin. Reseed as needed. Recharger - domed grate is in good condition. Subsurface chambers are dry with minimal sediment. No trash observed. Leaves observed in chamber beneath grate, but not enough to necessitate removal. No immediate maintenance required, however, leaves should be periodically removed. MGT130 Dry Detention Detention Basin - Floor of basin should be reseeded. No signs of erosion but signs of sedimentation. Overall, BMP is functioning well. Reseed as needed. No immediate maintenance needed. Spillway - stones contain leaves, dead branches and minor amounts of trash, which do not impede functioning, but could be removed for best practices. No immediate maintenance needed. Recharger - chambers have minimal sediment and leaves. No immediate maintenance needed. MGT131 Sediment forebay Sediment Forebay - Some sediment buildup observed. Refresh rip as needed. Sediment forebay grade should be restored to design conditions. No immediate maintenance needed. MGT132 Other Sediment forebay Stone filter berm / 3 connected swales - All inlets are full or partially full of stone, debris and leaves and requires routine maintenance. Stone berm contains sediment and leaf debris - stones should be cleared and refreshed. Some areas of sedimentation and loose soil on sides of swale and edge of pavement. Areas of soil in swale should have stones or grass/vegetation. Some weeds and dead vegetation noted. Routine maintenance such as removal of leaves and dead vegetation, and sediment recommended. Reseed basin as needed and as detailed in the site plans. Estabrook Elementary School 3 of 5 Town of Lexington Table 2: Lexington School BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT133 Dry Detention Dry Detention Basin - Reseed areas of the basin where grass is dead or absent. No trash, excess vegetation, etc. Overall in good condition. Routine maintenance such as clearing of dead and excess vegetation and trash is recommended. Recharger - overall in good condition. Minor leaves and dirt in chambers, but not enough to necessitate cleaning. No immediate maintenance needed. MGT134 Other Sediment Forebay Sediment forebay - Overall, sediment forebay is in good condition. Minor amounts of leaves and debris found within forebay. No immediate maintenance needed. MGT135 Dry Detention Dry Detention Basin - Areas of basin where grass has died or is absent need reseeding. Side of basin has evidence of erosion - reseed sides of basin without grass. Reseed basin and slopes of basin as needed and as recommended in the site plans. Recharger - chambers contain a moderate amount of trash and leaves. Routine maintenance such as clearing leaves and trash is recommended. MGT136 Other Sediment Forebay Sediment forebay - Overall, the sediment forebay has significantly improved compared to the last inspection. Minimal amount of leaves and debris found in forebay. No immediate maintenance needed. MGT137 Dry Detention Dry Detention Basin - Stones throughout basin contain some grass and sediment, but that should not impede BMP function. Minor amount of dead leaves and erosion observed. No immedate maintenance needed. Recharger - minimal sediment, trash, and leaves in chambers. Domed grates are in good condition. No immediate maintenance needed, however, leaves should be cleaned out regularly. Outlets : Leaf and rocks found within outlet. Outlet should be cleared to allow proper storm water flow. MGT191 Sediment Separator Hydro International separator located near asset DMH1666. First Defense model - No floatables, trash, or oil sheen. Approximately 7' of standing water and water is below the outlet pipe. A few inches of sediment in structure. No immediate maintenance needed. MGT193 Dry Detention Dry detention basin - Overall, basin is in good condition. Areas of dirt or dead grass should be reseeded. Riprap spillway overflow has some leaves which could be removed for best practices. No immediate maintenance needed. MGT78 -BMP does not exist and is within the same BMP as MGT135. Remove from PeoplesGIS and inventory. MGT79 Sediment Separator Sediment seperator - Minimal trash observed. Inlet pipe from playground is partially covered and needs some clearing. Outlet control structure need maintenance. Riprap area in front of control structure is full of leaves and large plants. Outfall near baseball field has trash and dead vegetation. Routine maintenance such as clearing larger, fallen trees, dead vegetation and removal of trash is recommended. Estabrook Elementary School 4 of 5 Town of Lexington Table 2: Lexington School BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT151 Infiltration Subsurface infiltration unit - Good condition. No sediment or debris. No immediate maintenance required. MGT152 Infiltration Subsurface infiltration unit. - Good condition. No sediment or debris. No immediate maintenance required. MGT73 Infiltration 24" Perforated HDPE Subsurface infiltration unit - Pre-treatment structure for this BMP was in good condition. No issues indicated. No immediate maintenance needed. MGT74 Sediment Separator Vortech Vortechnics Model 7000 separator unit - Approximately 3-ft of standing water observed. Approximately 7 inches of sediment build up. Maintenance guide suggests cleaning after 12-18 inches of sediment buildup. Routine maintenace such as cleaning is recommended after 12-18 inches of sediment is measured. Floatables chamber - significant amount of floatables. The chamber should be cleared of floatables. MGT75 Infiltration Subsurface chamber system - Opened observation well/port. Standing water observed. No immediate maintenance needed. MGT76 Sediment Separator Vortechnics Model 3000 sediment separator - Little to no debris or sediment. Little to no floatables noted. No immediate maintenance required. MGT153 Infiltration Could not locate BMP in parking lot or in surround grass within parking lot. No indication of BMP on site plans per Year 4 notes. MGT67 -MGT67 and MGT69 being duplicate points for MGT68, the BMP points have been retired. MGT68 Other Subsurface detention structure - There are 4 Nylonplastic observation ports located adjacent to structure. Structures are clean. A couple inches of standing water and debris observed in manhole structure. A few inches of sediment in the manhole. No immediate maintenance required. MGT69 -MGT67 and MGT69 being duplicate points for MGT68, the BMP points have been retired. MGT70 Infiltration Subsurface Infiltration Unit Subsurface infiltration unit - The inspection ports were opened and inspected. Small amount of standing water and sediment observed. No immediate maintenance required MGT71 Infiltration Subsurface Unit - Approx 2” of sediment buildup in BMP. No standing water observed. No immediate maintenance, aside from routine scheduled cleanings. MGT72 - MGT72 was a duplicate point for MGT71 and has since been retired. Town to review site plans and confirm connectivity of DMH2085. MGT125 Sediment Separator Sediment separator - Minor amount of sediment observed at inlet. Water level suggests stormwater is flowing as designed. Minimal sediment (<5”) and oil observed in base of structure. A couple of frogs found within the structure. No immediate maintenance needed. MGT126 Sediment Separator Stormceptor - Minimal oils. No large floatables. Estimated amount of sediment measured in the field is approximately 18" of sediment. Depth of standing water is 8'. The ports within the stormceptor is submerged under water. Cleaning of Stormceptor is recommended. MGT127 Below- Grade Storage Subsurface unit - Standing water and slight oil sheen observed in both the inspection port and the sub surface basin. Inspection port structures are semi sunken in. Regrading of pavement and routine cleaning is recommended. Subsurface Infiltration Unit Lexington High School Fiske Elementary School Harrington Elementary School Subsurface Infiltration Unit 5 of 5 envpartners.com TABLE 3 Non-School BMP Maintenance Items Town of Lexington Table 3: Non-school BMP Maintenance Items May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Maintenance Description 3 Aaron Road MGT108 Dry Detention Dry detention basin - Approximately 5' of standing water and some sediment observed. No immediate maintenance needed. Structure appears to be functioning properly. 6 Aaron Road MGT109 Dry Detention Dry detention basin - Approximately 5' of standing water and some sediment observed. No immediate maintenance needed. Structure appears to be functioning properly. 12 Boxwood Lane MGT116 Infiltration Infiltration Trench Sediment Forebay - Significant amount of sediment, leaf and vegetation buildup at inlet to structure. The forebay should be flat and inlet should be clear. Dirt and buildup should be removed so forebay is functioning properly. Routine maintenance such as cleaning is recommended. Infiltration Basin - Minor dead vegetation in outlet control structure and throughout the basin. Some erosion observed around the sides of the basin. Reseeding/restabilization of slopes recommended per site plans. No immediate maintenance needed. MGT121 Below- Grade Storage Subsurface infiltration gallery - No standing water observed. Sediment is observed. Routine maintenance such as cleaning is recommended. No immediate maintenance needed. MGT122 Below- Grade Storage Subsurface infiltration gallery - No standing water and oils or floatables observed. Moderate covering of sediment throughout galleries. Town to monitor sediment levels. No immediate maintenance needed. 13 Cider Mill Lane MGT209 Sediment Separator oil/grit separator Sediment separator (oil/grit separator) - Some sediment and approximately 30" of standing water observed. Some oil obseved. Outlet pipe in nearby infiltration basin is likely covered by leaves. Town should clean the sediment and trash from the chambers this year. Cider Mill Ln MGT107 Infiltration Infiltration Basin, located on a private road - The basin is overgrown and appears to not have been maintained in some time. The inlet pipe is partially full of leaves and dead vegetation. Additionally, the second inlet into the basin from the nearby separator was unable to be located and likely is covered by leaves. Full trees have grown up. Outlet structure appears to be functioning. Routine maintenance such as clearing of leaves in front of the inlets is recommended. Underdrain inspection ports were unable to be opened - Town should ensure underdrains are functioning properly. MGT1 Below- Grade Storage Infiltration Chamber Unable to open any inspection ports on this side of garage. Town to help open inspection ports to determine if structure is functioning. MGT100 Other Secondary Forebay Sediment forebay - Excess vegetation, phragmites, leaves, dead vegetation, sediment, and trash observed. Riprap areas are full of debris. Routine maintenance such as clearing of excess vegetation, trash and sediment is recommended. Riprap areas should be refreshed/cleaned as needed. Vegetation should be cut back in accordance with the planting plan. MGT101 Other Primary Forebay Sediment forebay - Sediment, plants, leaves, dead vegetation, dirt, grass, debris and trash observed. Phragmites (invasive species) noted. Routine maintenance such as clearing of debris, dead vegetation, trash and sediment is recommended. Riprap areas should be refreshed/cleaned as needed. Salt in front of the BMP should be regularly cleared/swept. MGT102 Other Dome Field Inlet Detention basin and dome field inlet - No cleaning needed of catch basin. Dead and excess vegetation observed. Routine maintenance such as clearing of dead and excess vegetation is recommended. The basin should primarily be grassed aside from a couple other plants - reference planting plans. Carey Memorial Library DPW 1 of 7 Town of Lexington Table 3: Non-school BMP Maintenance Items May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Maintenance Description MGT11 Filter Filter device to remove sediment from roof drainage - Sediment has accumulated and should be cleaned routinely. No immediate maintenance needed. Remove dead vegitation. MGT12 Filter Sediment and leaves observed in front of the inlet. Routine maintenance such as clearing of leaves and sediment is recommended. MGT13 Filter Inlet pipe is 5% full of sediment. Riprap is beneath the grass. Excess vegetation in front of the inlet pipe observed. Routine maintenance such as clearing of excess vegetation, removal of sediment and refreshing/replenishing riprap is recommended. MGT14 Dry Detention Wetland Wet basin - Trash, leaves, sediment, and other dead vegetation should be removed from basin. Basin water is very dark, suggesting lots of decaying vegetation and suspended solids. Phragmites (invasive species) observed, which should be removed. The riprap near the low point and entering the basin should be cleaned. Sedimentation is observed at the beginning of the basin at the rip rap. Rip rap should be refreshed/cleaned. MGT15 Infiltration Porous Pavement Pervious pavement - Some sediment noted. Parking area should be vacuum swept this Spring. MGT16 Infiltration Porous Pavement Pervious pavement - Some sediment noted. Parking area should be vacuum swept this Spring. MGT17 Infiltration Porous Pavement Pervious pavement - Some sediment noted. Debris has accumulated along curbing of parking area. Parking area should be vacuum and swept this Spring. MGT18 Infiltration Porous Pavement Pervious pavement. Some sediment noted. Parking area should be vacuum swept this Spring. MGT19 Water Quality Swale Water quality swale - The swale is significantly overgrown. Outlet is partially covered by vegetation. Riprap channels from parking lot are full of debris/soil. Algae is growing in water of swales, suggesting excess nutrients in swale. Routine maintenance such as clearing of excess vegetation, removal of sediment and trash, and refreshing/replenishing riprap is recommended. MGT195 Sediment Separator Hydro International Hydro International, Downstream Defender unit - Some sediment, approximately 3' standing water, vegitation, floatables, and oils observed. Full separator cleaning is recommended. Duplicate point of MGT194 and has been retired. MGT2 Below- Grade Storage Infiltration Chamber Subsurface infiltration unit - Filled with sediment. Full infiltration chamber cleaning is recommended. MGT3 Below- Grade Storage Infiltration Chamber Subsurface infiltration system - Unable to open 1 out of the 3 clean out ports. The port that was opened was full of debris. Town to assist with opening the stuck cleanout ports and clean the cleanout port filled with debris prior to the next inspection. MGT4 Below- Grade Storage Infiltration Chamber Subsurface infiltration unit - Unable to open inspection ports. Town to assist with opening the inspection ports prior to the next inspection and clean the ports as needed. MGT5 Below- Grade Storage Infiltration Chamber Subsurface infiltration unit - Only able to open 2 of the 4 cleanout ports. The 2 ports that were open were either full of sediment or had a broken clean out cover. Town to assist with opening the inspection ports prior to the next inspection and clean the ports as needed. MGT6 Below- Grade Storage Infiltration Chamber Subsurface infiltration unit - Unable to open inspection ports. Town to assist with opening the inspection ports prior to the next inspection and clean the ports as needed. DPW 2 of 7 Town of Lexington Table 3: Non-school BMP Maintenance Items May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Maintenance Description MGT7 Sediment Separator Sedimentatio n Chamber Hydro International Downstream Defender unit - Approximately 20" of sediment and some standing water and oils observed. Full separator cleaning is recommended. Follow Hydro International Downstream Defender unit manufacturer recommended cleaning instructions. MGT8 Filter Green Roof Rooftop garden/green roof - Overall, it's in good condition. Dead vegetation should be removed. Reference planting plan to ensure current vegetation is as designed and reseed as needed. MGT9 Filter Detention basin - Dead and excess vegetation observed. Both scupper inlets from parking area have leaf and sediment build- up. Minimal trash observed.Slope erosion is observed and the geotech mesh is exposed. Routine maintenance such as clearing of dead and excess vegetation, removal of sediment and trash is recommended. Beehive grate - covered with overgrown vegetation and standing water is observed. Routine maintenance such as removal of overgrown vegetation is recommended. MGT94 Water Quality Swale Two (2) water quality swales - Swales are overgrown. Dead vegetation, phragmites, sediment, and trash observed. Routine maintenance such as clearing of excess and dead vegetation, removal of sediment and trash is recommended. Swales should be generally cut back and routinely maintained. MGT95 Other Oil and Grease Trap Drains to sanitary sewer system; did not inspect. Suggest removing asset BMP inventory. MGT96 Other Dome Field Inlet Rain garden - Dead vegetation, leaves, overgrown vegetation and areas of dirt observed. Beehive grate is in good condition. Routine maintenance such as clearing of excess and dead vegetation, and reseeding areas of dirt is recommended. Reference planting plan to ensure plant growth is as designed. MGT97 Other Bioretention Basin Cleanout Beehive grate - Approximately 2' of standing water. A few inches of sediment has accumulated. Inlet/outlet are clear. No immediate maintenance needed. MGT98 Other Dome Field Inlet Dome field inlet - Standing water flush with the hood of the inlet pipe observed. Minimal sediment buildup. Dead vegetation, trash, and sediment observed. Routine maintenace such as clearing dead vegetation, trash and sediment is recommended. All dirt areas should be reseeded. The basin should primarily be covered with grass. MGT99 Other Stand Pipe Detention basin - Dead vegetation, leaves, weeds, trash, and sediment within riprap observed. Routine maintenace such as clearing dead vegetation, trash and sediment is recommended. All dirt areas should be reseeded. Both scupper inlets from parking area need to be cleaned of leaves and sediment - the riprap stones should be refreshed. 71 East Street MGT106 Infiltration Subsurface infiltration system - Some water and minimal sediment noted in system. Base of infiltration system seems to be stone. No immediate maintenance needed. DPW 3 of 7 Town of Lexington Table 3: Non-school BMP Maintenance Items May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Maintenance Description MGT196 Other Porous Pavement Porous Pavement - Sweeping should occur at least 2x annually with one event happening in May. Cleanout ports have little to no sediment. Overall, in good condition. MGT198 Other Sediment Forebay Sediment Forebay - Standing water, sediment, trash, dead vegetation and leaves observed. Routine maintenace such as clearing dead vegetation, leaves, trash and sediment is recommended. MGT199 Other Bioretention Basin Bioretention basin - Dead vegetation, leaves, trash observed. Minimal sediment and oil erosion observed around catch basin and throughout the basin. Routine maintenace such as clearing dead vegetation, leaves, trash and sediment is recommended. Reseeding and regrading of slopes are recommended per site plans. MGT200 Other Sediment Forebay Sediment Forebay - Significant sediment observed at the entrance of the forebay. Leaves, dead vegetation, and trash observed. Some erosion along the banks of the forebay observed. Routine maintenace such as clearing dead vegetation, leaves, trash and sediment is recommended. Riprap should be refreshed or replenished where needed. Reseeding and regrading of slopes are recommended per site plans. The small drainage channel from the pavement should be regraded to be a more gradual slope. MGT201 Other Porous Pavement Porous Pavement - Minimal sediment observed in cleanout ports. Sweeping should occur at least 2x annually with one event happening in May. MGT202 Other Sediment Forebay Sediment Forebay - Sediment, leaves, dead vegetation, and trash should be observed. The floor of forebay is clogged with leaves/etc. which limits infiltration. Routine maintenace such as clearing dead vegetation, leaves, trash and sediment is recommended. Riprap should be refreshed or replenished where needed. Stone channel from pavement needs to be cleared out - ensure grading is gradual. MGT203 Other Bioretention Basin Bioretention basin - Trash, dead vegetation, and leaves observed. Minor sediment build up and erosion observed. Routine maintenace such as clearing dead vegetation, leaves, trash and sediment is recommended. Ensure base of channel is vegetated. Reseeding as needed per site plans recommended. MGT204 Other Sediment Forebay Sediment Forebay - Trash, dead vegetation and some sediment observed. Routine maintenace such as clearing dead vegetation, leaves, trash and sediment is recommended. Stone channel into basin should be cleaned. MGT205 Other Bioretention Basin Bioretention basin - Dead vegetation, and leaves observed. Some erosion observed. Routine maintenace such as clearing dead vegetation, leaves, trash and sediment is recommended. Ensure base of channel is vegetated. Reseeding as needed per site plans recommended. MGT206 Other Subsurface Infiltration System Retain It Subsurface unit - Minimal sediment. Unit was dry. No issues noted. No immediate maintenance needed. MGT207 Other Subsurface Infiltration System Retain It unit - Some sediment observed at the bottom of the structure Manhole in front of bay 4 is minor amount of debris. No standing water observed at either of the manholes. Routine maintenance such as cleaning is recommended. Fire Department 4 of 7 Town of Lexington Table 3: Non-school BMP Maintenance Items May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Maintenance Description 10 Fox Run Lane MGT103 Infiltration Infiltration system - The manhole near residents garden appeared to be paved over. The next manhole, DMH1993, was opened an inspected. A couple inchs of sediment and 19" of standing water observed. Inlet from two (2) catch basins on East Street appear to discharge to this BMP - mapping updates needed. Town to assist with inspecting the asset and/or alert resident that BMP inspections will occur and that asset will need to accessible. No immediate maintenance needed aside from regularly scheduled cleanings. MGT61 Infiltration Infiltration system - No excess sediment or water observed in the inspection port. Outlet is filled with leaves. Removal of leaves and overgrown vegetation is recommended in front of the outlet. MGT62 Sediment Separator Sediment separator - Separator flows to infiltration system which flows to outfall. 3' of standing water and minimal sediment observed. No immediate maintenance needed. MGT57 Other Settling Tank Settling tank; The drain manhole at the edge of cul-de-sac garden (no asset ID). Approx. 12" standing water and 4" of sediment in sump observed. Routine maintenance such as cleaning is recommended. MGT58 Infiltration Infiltration system - Unable to locate any inspection port. Additional Town assistance needed to locate the inspection port. Outlet in downstream manhole - A ppears to be functioning normally. No signs of issues. No immediate maintenance needed aside from regularly scheduled cleanings. MGT59 Sediment Separator Sediment separator - A few inches of sediment and 13" of standing water. Some oils observed. Separator appears to be functioning; no immediate maintenance needed. Confirm connectivity; last years notes state that the structure does not go in the direction of the infiltration unit. While cleaning, Town should investigate BMP connectivity. MGT60 Infiltration Infiltration system - Could not locate infiltration system. The inlet pipe could be perforated and infiltrating but could not be confirmed during the time of inspetion. Site plans needed to confirm location of system. Outlet manhole (no asset ID) has some sedimentat the base of the manhole and no standing water. Routine maintenance such as cleaning is recommended for the outlet manhole. 5 Keller Farm Way MGT105 Infiltration Infiltration system - Could not locate infiltration observation port. Overall, the upstream and downstream structures appear to be working correctly. No immediate maintenance needed other than locating the inspection port .Town to assist in locating the observation port. MGT104 Infiltration Infilration system - Could not locate at time of inspection. Potentially buried under grass. Town to assist in locating the observation port. MGT208 Sediment Separator Stormceptor Stormceptor located in drain manhole (asset ID DMH2252) - Unable to open inspection port to fully inspect - cover was stuck. Some sediment observed in unit. Routine cleaning as mentioned in the O&M manual is recommended. 10 Keller Farm Way MGT211 Sediment Separator Stormceptor Stormceptor proprietary separator unit located in drain manhole (asset ID DMH2253) - 4" inches of sediment noted. No excess oils or trash. No immediate maintenance needed. 5 Luongo Farm Lane MGT217 Sediment Separator Stormceptor Stormceptor - Added in Year 5. Sediment and leaves found throughout the unit. Based on the amount of buildup found in the unit, it does not appear that the unit has been maintained in some time. Immediate cleaning of unit recommended to allow proper stormwater flow and treatment. 7 Luongo Farm Lane MGT155 Other Subsurface Infiltration System Infiltration subsurface system - Manholes upstream and downstream of subsurface infiltration unit opened and observed. Downstream manhole is DMH2396 and has some sediment - for best practices, the debris should be removed. Infiltration system does not reqiore immediate maintenance, but should be periodically cleaned, per manufacturer specifications. 9 Luongo Farm Lane MGT210 Sediment Separator Stormceptor Stormceptor - Approximately 4-8" of sediment. Oil sheen observed in inspection ports. Large clumps of debris observed. Inlet/outlet clear. No immediate maintenance needed aside from regularly scheduled cleanings. Howard Munroe Place 1 Granger Pond Way Johnson Farm Road 3 Keller Farm Way 5 of 7 Town of Lexington Table 3: Non-school BMP Maintenance Items May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Maintenance Description MGT51 Infiltration Infiltration system - Some sediment and trash. Structure appears to be outlet control structure of infiltration system - need site plans to confirm. Routine maintenance such as cleaning is recommended. MGT52 Infiltration Sedimentation chamber - Some sediment observed (approximately 10" measured). Standing water observed. Routine maintenance such as clearing of sediment build up is recommended. MGT53 Infiltration Infiltration system - During the time of inspection, the manhole could not be inspected and was seal shut. Town assistance required to open manhole. Per last year's notes, manhole likely needs cleaning. The downstream manhole is a sedimentation basin and was observe having approximately 10" of sediment. Munroe Center for the Arts MGT37 Dry Detention StormTech Filtration strip - The area is dry with minimal sediment and no trash. Vegetation immediately after filtration strip is dead, reseed as needed, per design plans. No oils or trash observed within catch basins or surroundingmanholes. No immediate maintenance needed. MGT118 Infiltration Bioinfiltration Basin Area has not been maintained in some time. All dead vegetation, fallen trees, sediment and trash should be removed. Confirm with design plans and town if the area is designed to be a constructed wetland. Stone Spillway - Leaves and encroaching vegetation observed. Remove leaves and sediment. All stones should be clear and visible. Basin - basin is overgrown with vegetation and contains dead vegetation. Basin is located in wetlands buffer; confirm with Town if maintenance can be conducted within and around the basin area. MGT119 Infiltration Detention Pond This pond is fully within wetlands delineation, according to site plans. It is likely that a BMP does not exist here. The pond located adjacent is the old reservoir. Verify with Town if this pond is a BMP (wet basin) MGT120 Filter Biofilter Basin Biofilter Basin - Dead vegetation, debris, and leaves observed. Reseeding may still be necessary as there are some patches of dirt on basin bottom and sides. Outlet control structure is generally in good condition; leaves observed in riprap, just below the outlet. Routine maintenance such as pruning, mowing, clearing of dead vegetation and leaves, and reseeding as needed is recommended. Sediment Forebay - Significant sedimentation at inlet. The base of the forebay should be a couple inches lower than invert of inlet, but instead it's higher. Riprap should be exposed and cleaned. Sedimentation seen in front and around the inlet structure should be removed. Old Reservoir Parking lot MGT54 Filter Porous Asphalt Porous pavement - It should be swept a minimum of 2x per year, once including once this Spring. Subsurface drains should be cleaned out at inspection ports with vacuum. Cleanout caps and cleanouts appear to be in good condition. MGT213 Infiltration Infiltration system - Resident was not home at the time of the inspection and could not be accessed. Per year 5's notes, the BMP has no outlet or access ports on site plan or identified in field. Upstream structure is the sedimentation basin, which likely requires cleaning. This structure likely needs cleaning as well, especially if it has not been maintained in a year or two. Per the site plans, the unit should be a 100 Cultec recharger 330 units. MGT64 Sediment Separator Sedimentatio n Chamber Sediment chamber - Resident was not home at the time of the inspection and could not be accessed. Manhole is buried under soil. Opend the upstream manhole dMH2041 and some sediment was observed. Per the year 5 notes, the BMP is a sedimentation basin. The basin likely needs maintenance/to be cleaned. Over 1' of sedment was observed last year. Town to monitor BMP and drainage area. Minuteman Commuter Bikeway Parking Lot Old Reservoir 6 Porter Lane 6 of 7 Town of Lexington Table 3: Non-school BMP Maintenance Items May 2024 Environmental Partners Location Facility ID BMP Category BMP Type Maintenance Description 25 Robinson Road MGT39 Other Opened upstream catch basin (IN7260) leading into the BMP and saw a 8" HDPE. Could not locate the specific BMP. Town to review BMP and determine if this site is worth retiring. 33 Robinson Road MGT40 Other Opened upstream catch basin (IN7261) leading into the BMP and saw a 8" HDPE. Could not locate the specific BMP. Town to review BMP and determine if this site is worth retiring. 3 Smith Farm Lane MGT91 Infiltration Infiltration system - Manhole (DMH2235) has weir and has some sediment with 17" standing water. Downstream manhole was in good condition. An oil sheen observed. No immediate maintenance needed. No manholes or cleanout ports on top of Subsurface unit found. 5 Smith Farm Lane MGT93 Infiltration Infiltration system - No trash, excess debris, no clogging. No immediate maintenance needed. 5 Taylor Lane MGT63 Infiltration Unable to locate any inspection port if it exists. The upstream manhole has some sediment and minor standing water. Routine cleaning is recommended. Since the infiltration system lacks pre-treatment to remove sediment, the Town could consider videoing the infiltration system, finding the inspection port, jetting the system, or another method to confirm that the system is working properly. Tyler Road Intersection MGT117 Other Rock Swale Rock swale - The swale better described as an infiltration trench or a sediment forebay. Reference site plan to confirm design intent. Stones have some sediment near pavement and minor dead vegetation. For best practices, Town could remove sediment and vegetation. No immediate maintenance needed. MGT55 Other Settling Tank Settling tank - Resident was not home during time of inspection, thus the downstream manhole DMH1997 was opened. Some sediment and standing water observed. The BMP likely consists of a deep sump manhole that collects sediment. No immediate maintenance needed aside from regularly scheduled cleanings. MGT56 Infiltration Unable to locate inspection port. It likely is locate in residential lawn or garden. Town should locate inspection port, if one exists. Outlet pipe in downstream manhole is clear. Minor amount of sediment observed in the downstream structure (asset ID DMH1996). No immediate maintenance needed aside from regularly scheduled cleanings. MGT20 Sediment Separator Sedimentatio n Chamber Sedimentation chamber - Deep sump catch basin. A couple inches of sediment. Oil sheen observed. No immediate maintenance needed. MGT21 Infiltration Infiltration Chamber Infiltration chamber - Could not locate at the time of inspection. Town assistance requested. MGT22 Sediment Separator Sedimentatio n Chamber Sedimentation chamber - Minimal amount of trash. No immediate maintenance needed. MGT23 Infiltration Infiltration Chamber Subsurface Infiltration System - Inspection port inspected and no sediment or water observed. No immediate maintenance needed aside from regularly scheduled cleanings. MGT212 Sediment Separator Sedimentatio n Chamber Sedimentation chamber - Downstream manhole (dMH2233) needs to be cleaned due to debris in inlets and outlets. The manhole was buried under grass and should be exposed. If the structure has not been cleaned in a couple of years, best practices suggest it should be cleaned. MGT92 Infiltration Infiltration basin - The upstream structure inlet could not be located. The sedimentation basin is a manhole, buried under grass. For best practices, the manhole should be exposed for easy access. Downstream manhole (dMH2233) needs to be cleaned due to debris in inlets and outlets. 3 Wisteria Lane 164 Wood Street 9 Webb Street 7 of 7 envpartners.com TABLE 4 Charles River Watershed BMP Maintenance Items Town of Lexington Table 4: Charles River Watershed BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT123 Other Vegetated Filter Strip Vegetated filter strip -There is some soil erosion around the filter strip. Reseed and replenish the filter in areas and where needed. Remove any overgrown and dead vegetation. MGT175 Sediment Separator Contech Contech unit - Approximately 4.5' of standing water and few inches of sediment observed. Minimal floatables. No immediate maintenance needed. Routine maintenance such as cleaning is recommended per the Contech O&M plan. MGT144 Infiltration Subsurface Infiltration Unit Subsurface infiltration unit - Minor sediment buildup. No standing water. Unit appears to be in good condition. No immediate maintenance needed. MGT146 Infiltration Subsurface infiltration unit - No water in unit. Some amount of trash and sediment in basin. Outlet control structure is in good condition. No immediate maintenance needed. Routine maintenance such as cleaning is recommended. MGT147 Infiltration Subsurface infiltration unit - Approx. 13” of standing water, with minimal sediment. Water level is 3" higher than that of the discharge wetlands. Verify if this manhole is actually an infiltration unit or a regular stormwater manhole. No immediate maintenance needed. MGT148 Infiltration Infiltration system - Approximately 5' of standing water and a few inches of sediment observed. No immediate maintenence needed. MGT149 Other Sediment Forebay Sediment forebay - Significantly overgrown. The riprap apron around the inlet is covered with plants, soil, and sediment. The inlet pipe has debris within it. The sides of the forebay also have excess vegetation and dead vegetation. Minimal trash noted. Routine maintenance such as pruning is recommended. Vegetation should be cut back to allow access to sediment forebay. MGT150 Other Sediment Forebay Sediment forebay - Significantly overgrown. Excess vegetation growth and dead vegetation noted. Some trash noted. Riprap areas have some soil, sediment, and vegetation. Gravel base also has soil and vegetation, especially near inlet. Dead vegetation noted on sides of structure. Inlet covered in debris. Routine maintenance such as pruning is recommended. Vegetation should be cut back to allow access to sediment forebay. MGT162 Sediment Separator Hydroworks Hydroguard unit - Approximately 5’ of standing water with a few inches of sediment. Inlet and outlet in good condition. Trash and organic floatables observed. No immediate maintenance required. Routine maintenance such as cleaning is recommended per the Hydroworks O&M manual. MGT163 Sediment Separator Contech unit - No floatables and minimal surface oils. Approximately 5' of standing water and some sediment observed. No immediate maintenance required. Routine maintenance such as cleaning is recommended per Contech O&M manual. Bowman Elementary School Clarke Middle School 1 of 5 Town of Lexington Table 4: Charles River Watershed BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT164 Sediment Separator Hydroworks Hydroguard Hydroworks Hydroguard unit - Standing water level is approximately 3’ lower than outlet invert, suggesting some infiltration is occurring in unit. Approximately 3" of sediment and minimal floatables observed. No immediate maintenance required. Routine maintenance such as cleaning is recommended per the Hydroworks O&M manual. MGT165 Sediment Separator Hydroworks Hydroguard Hydroworks Hydroguard unit - Approximately 3’ of standing water with 5" of sediment. Floatables consist of wood, leaves, and trash. Inlet is clear. Cleaning of sediment and floatables is recommended. Routine maintenance is also MGT166 Sediment Separator Hydroworks Hydrostorm Hydroworks Hydrostorm unit - Approximately 3' of standing water, a few inches of sediment and minimal floatables observed. No immediate maintenance required. Routine maintenance such as cleaning is recommended per the Hydroworks O&M manual. MGT167 Sediment Separator Hydroworks Hydrostorm Hydroworks Hydrostorm unit - Approximately 3' of standing water and afew inches of sediment at the bottom of the structure observed. Some trash on surface. No immediate maintenance needed but routine maintenance such as cleaning recommended per Hydroworks O&M manual. MGT168 Sediment Separator Hydroworks Hydrostorm Hydroworks Hydrostorm unit - Approximately 6' of standing water and few inches of sediment at the bottom of the structure observed. Some sediment buildup in front of the inlet structure but it does not appear to be hindering it's function. Minimal floatables. No immediate maintenance needed. Routine maintenance such as cleaning recommended per O&M plan. MGT89 Unknown Bioretention Basin Bioretention basin - Significantly overgrown but likely still functioning well. Inlet was buried during the time of inspection. Some trash noted. Dead vegetation observed on outlet pipe to wetlands. Outlet control structure is in good condition. No signs of erosion. Routine maintenance such as pruning recommended. Vegetation should be cut back and maintained. Clarke Middle School 2 of 5 Town of Lexington Table 4: Charles River Watershed BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT182 Other Recharger Contech unit - Approximately 5' of standing water and a few inches of sediment observed. Minor amount of floatables and trash in the standing water. No immediate maintenance needed. Routine maintenance such as cleaning is recommended per the Contech O&M manual. MGT184 Other Level Spreader Level Spreader - Heavy vegetation growth observed. Routine maintenance such as pruning is recommended. All vegetation and leaves should be removed from aggregate. MGT185 Other Level Spreader Level Spreader - Minor amount of debris and leaves observed. Routine maintenance such as clearing of debris and leaves is recommended. MGT186 Other Level Spreader Level spreader/vegetated filter strip - Some overgrown and dead vegetation observed throughout the area. Routine maintenance such as pruning is recommended. Remove excess and dead vegetation and replenish media where needed. MGT187 Other Stormwater Recharger Stormwater recharger - Classified as a stormwater recharger but it looks more like a subsurface infiltration unit. No standing water seen at the bottom of the structure. Replenish stones at the bottom of structure as needed. No immediate maintenance needed. MGT188 Other Bioretention Basin Bioretention basin - Leaves and debris within riprap observed. Routine maintenance such as clearing of leaves and debris within riprap recommended. Replenish/refresh riprap as needed. Contech unit - Approximately 3' of standing water and 10" of sediment ovserved. Some floatables and trash also observed. Routine maintenance such as cleaning is recommended per the Contech O&M manual. MGT189 Other Bioretention Basin Bioretention basin - Some trash excess vegetation and large amount of algae overgrowth observed. Routine maintenance such as pruning/mowing and refreshing of riprap is recommended. MGT190 Other Bioretention Basin Bioretention basin - Some overgrown vegetation throughout the bioretention area. Some trash observed at the mouth of the inlet. Routine maintenance such as pruning/mowing and removal of trash is recommended. Reseed as needed and as detailed in site plans. Hasting's Elementary School 3 of 5 Town of Lexington Table 4: Charles River Watershed BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT218 Other Porous Asphalt Porous asphalt - Routine sweeping recommended. No immediate maintenance needed. MGT219 Other Recharger Contech unit - Approximately 4" of sediment and 5' of standing water observed. Minor amount of trash found. Routine maintenance such as cleaning is recommended per Contech O&M plan. No immediate maintenance needed. Confirm with Town if MGT183 is a duplicate of new MGT219; if so, point can be removed. MGT220 Sediment Separator Contech Contech unit - Found during Year 6 inspections and added to inventory. The inlet and outlet are clear. Approximately 4' of standing water and 7" of sediment observed. Floatables and minor amount of trash. Routine maintenance such as cleaning is recommended per Contech O&M plan. No immediate maintenance needed. MGT221 Sediment Separator Contech Contech system - - Found during Year 6 inspections and added to inventory. Approximately 3' of standing water and a few inches of sediment observed. Routine maintenance such as cleaning is recommended per Contech O&M plan. No immediate maintenance needed. MGT138 Other Porous Asphalt Porous asphalt - Routine sweeping recommended. No immediate maintenance needed. MGT139 Dry Detention Detention basin - S ome overgrown vegetation seen throughout the basin. Routine maintenance such as pruning/mowing is recommended. Reseed as needed and as detailed in site plans. Sediment forebay - Remove overgrown and dead vegetation and trash where needed. Inlets - The inlets are clogged with leaves and sediment. Routine maintenance such clearing of inlets within the dry detention basin is recommended. MGT140 Infiltration Subsurface infiltration unit - Leaves and other debris seem to have washed in from upstream separator that needs immediate cleaning. Stone depth eroded at inlet discharge point. MGT141 Dry Detention Dry detention basin - Dead and overgrown vegetation observed . Little to no sediment buildup within riprap at the inlet structure. Routine maintenance such as clearing of dead and overgrown vegetation and refresh/replenished of riprap as needed is recommended. MGT142 Other Swale Swale - Significantly overgrown. Riprap near inlet still has sediment buildup allowing plants to grow. Dead vegetation throughout swale observed. Floor and sides of swale should be grassed. Minor amount of trash observed. Routine maintenance such as pruning/ mowing, removal of trash, and refreshing/replenishing of riprap is recommended. Reseed as needed and as detailed in site plans. Lexington Children's Place Hasting's Elementary School 4 of 5 Town of Lexington Table 4: Charles River Watershed BMP Maintenance Items May 2024 Environmental Partners School Name Facility ID BMP Category BMP Type Maintenance Description MGT143 Infiltration Could not locate the BMP during the time of inspection. Town assistance needed to locate. May be buried under grass. MGT169 Sediment Separator Contech Contech unit - Approximately 5.5' of standing water observed. Inlet is partially full of debris/sediment, and outlet has debris/sediment too. Flared-end inlet from pavement has sediment and leaf buildup . Routine maintenance such as sediment removal from inlet, outlet, and sump of unit is recommended. MGT170 Sediment Separator Contech Contech unit - Similar to last year, the separator is in poor condition. Significant sediment and leaf debris is observed within the unit. Inlet is clogged with sediment. Upstream inlet from the pavement has collected sediment and likely that sediment has overflowed into separator. Routine maintenance such as removal sediment and leaves from the inlet, and sump of unit is recommended. MGT171 Sediment Separator Contech Contech unit - A few inches of sediment at the bottom of the structure and a few inches of sediment at the inlet observed. Routine maintenance such as cleaning is recommended per Contech O&M plan. No immediate maintenance needed. MGT172 Sediment Separator Contech Contech unit - Buried under grass. Town to assist with accessing the structure. MGT173 Sediment Separator Contech Contech unit - Approximately 18" of standing water and 2" of sediment. Some floatables consisting of trash and debris. Sediment has accumulated near inlets, which is not currently impeding function. Routine maintenance such as cleaning is recommended and as needed per there Contech O&M manual. MGT174 Sediment Separator Sediment separator - No immediate maintenence needed. Lexington Children's Place 5 of 5 Town of Lexington, MA (027871.16) 1 Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 Town of Lexington – Strategic Stormwater Communication and Outreach Plan 1. BACKGROUND The Town of Lexington, Massachusetts (Town) is in the process of updating its June 2023 Phase 1 Phosphorus Control Plan (PCP), which includes: a performance evaluation documenting progress made on implementing the Phase 1 PCP; information related to quantifying the total phosphorus removal of existing private and municipal structural Stormwater Control Measures (SCMs); communication and outreach strategies related to stormwater management and infrastructure; refinement of semi-structural and non- structural SCMs and their resulting total phosphorus removal; a detailed funding strategy for implementing the PCP; and a financial capability analysis. Managing stormwater and achieving compliance with the U.S. Environmental Protection Agency’s (US EPA’s) Massachusetts Small Municipal Separate Storm Sewer System (MS4) General Permit is an ongoing and long-term requirement affecting the Town now and into the future. The purpose of this Strategic Stormwater Communication and Outreach Plan (Outreach Plan) is to specify the methodology and approach to perform effective dissemination of information associated with stormwater management, MS4 General Permit compliance requirements, water quality, and SCM maintenance. This Outreach Plan outlines the key audiences for this information, identifies their respective topics of interest, presents key messages to emphasize, and recommends engagement strategies and platforms. The intent of this Outreach Plan is to provide guidance on communicating to the general public about stormwater management and system maintenance, to elected Town officials about the compliance and financial impacts related to stormwater management, and to developers about stormwater design and system maintenance requirements. 2. OUTREACH GOALS AND OBJECTIVES The objectives of the Outreach Plan include, but are not limited to: • Fostering coordination, collaboration, and communication among various key audiences to build public support for stormwater management; • Responding quickly and effectively to any questions that may arise, specifically throughout the MS4 General Permit compliance process and implementation of the Town’s PCP; • Developing key messages to assist with consistent messaging and communication regarding stormwater management; • Educating and involving key audiences; and • Establishing contacts within local organizations that can assist with broadening outreach by communicating stormwater management efforts. Town of Lexington, MA (027871.16) 2 Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 3. KICKOFF WORKSHOP To best develop this Outreach Plan, the Town began by meeting in a Kickoff Workshop to discuss and understand the various communities within Lexington, explore messaging approaches, and review existing public outreach efforts. During this workshop, the Town described their strong foundation for public engagement which can be expanded to further address stormwater, water quality, flood management, and compliance. The Outreach Plan leverages existing public outreach platforms and materials related to sustainability, climate, and public works and identifies opportunities to utilize and update these. Ongoing meetings and conversations with department leads who were not present at the initial kickoff workshop will be necessary to implement a comprehensive outreach strategy with full buy-in by implementors. 4. COORDINATION WITH OTHER DEPARTMENTS Working collaboratively with other Town departments is a key strategy in this Outreach Plan. Many other departments distribute information that may include information related to stormwater such as the Sustainability & Resilience, Recreation & Community Programs, Public Schools, Public Facilities, Conservation, Engineering, and Environmental Services departments. Opportunities exist to capitalize on outreach efforts through interdepartmental coordination. For example, there could be an opportunity to host an informational booth during a Recreation and Community Program activity, or stormwater educational content could be added to the newsletter mailed to senior citizens in Lexington. The Town is encouraged to share stormwater management related information in interdepartmental meetings and invite staff from other departments to meetings with stormwater topics as appropriate. The Engineering Department will also prepare written updates to be shared with other departments through the Town Manager weekly updates on a quarterly basis or as needed. These updates may include topics such as general information about stormwater and water quality; the purpose and importance of stormwater infrastructure; financing the development and implementation of the Town’s PCP, including construction, inspection, and maintenance of SCMs; changes to Town operations related to semi-structural and non- structural SCMs; and compliance requirements and repercussions for non-compliance. 5. KEY AUDIENCES To develop an effective communication and outreach plan, it is necessary to identify the different types of audiences within the Town, what is most important to each audience, and how they can be most effectively reached. This information has been identified to guide the selection of messaging topics and outreach mechanisms and is summarized in the following table. Outreach mechanisms are described in more detail in Section 7. It is important to note that stakeholders could fit into multiple audience types or could change type based on timing, key issues, current events, or other factors. Audience Type Topics of Interest Outreach Mechanisms Outreach Timing Single-Family Private SCM Owners Annual inspection and maintenance requirements. Maintenance instructions and/or assistance. Handouts/mailings Annually (Spring) Multi-Family and Commercial Annual inspection, maintenance, and reporting requirements. Repercussions for non-compliance. Handouts Annually (Spring) Informational letter June/July 2024 In-person site visit July/August 2024 Town of Lexington, MA (027871.16) 3 Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 Audience Type Topics of Interest Outreach Mechanisms Outreach Timing Private SCM Owners Elected Officials Financing the development and implementation of the Town’s PCP, including construction, inspection, and maintenance of SCMs; program management; and changes to Town operations related to semi- structural and non-structural SCMs. Compliance requirements and repercussions for non-compliance. Presentations, handouts, and briefings at Select Board meetings Annually (March) at a minimum Residents (Non SCM owners) General information about stormwater and water quality. Education about the importance of stormwater infrastructure. Website update Annually (July) Section in the Link to Lexington (digital newsletter) Annually (Spring) Community events or public meetings Annually (August – National Water Quality Month) Tourists General information about stormwater and water quality. Education about the importance of stormwater infrastructure. Signage at highly visible stormwater facilities (e.g. near tourist attractions or areas of interest). N/A (One-Time Improvement) Non- Government Organizations (NGOs) and Committees The importance of stormwater and water quality could become part of the messaging of local NGOs who participate in community events such as community clean up days. One-on-one coordination meetings Annually (Spring) New Developers Operation and maintenance design considerations. Compliance with Town, State and Federal stormwater regulations. Handouts to be posted on the Town Website Summer 2024 Other Town staff General information about stormwater and water quality. Education about the importance of stormwater infrastructure. Financing the development and implementation of the Town’s PCP, including construction, inspection, and maintenance of SCMs; program management; and changes to Town operations related to semi- structural and non-structural SCMs. Compliance requirements and repercussions for non-compliance. Town Manager written weekly updates Quarterly (as needed) Town of Lexington, MA (027871.16) 4 Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 6. KEY MESSAGES Using the MS4 General Permit framework, as well as an understanding of the audience’s existing stormwater knowledge and the topics of interest outlined in Section 3 above, the Town developed key messages for all audiences. These key messages will become the foundation of all stormwater outreach efforts. They will serve as the most important and succinct pieces of information to acquaint audiences with stormwater management basics, the Town’s compliance needs, and other related information. All stormwater outreach content development will begin with, and build upon, these key messages. During Permit Year 7, the Key Messages will be expanded upon to be more specific for certain audiences. For example, messaging to other Town departments or Town leadership and elected officials will differ from messaging to the general public. The key messages in Appendix A are the initial messages to provide a foundational understanding of stormwater. They will continue to be emphasized at all future meetings, public engagement opportunities, and within newsletters, but will be especially highlighted during the initial stages of public outreach planned for MS4 General Permit Year 7 (Fiscal Year 2025). These initial stages of outreach are described further in Section 8 of this Outreach Plan. 7. OUTREACH MECHANISMS The Town has a robust communications and public outreach program which will be leveraged during the implementation of this Outreach Plan. We will create educational materials for specific audiences and use known best practices for effective public outreach. In addition to print and electronic media channels, various communication tools such as in person educational programs, community events, partnerships, advertising, and sponsorship opportunities can be considered and specified for best use of the Town’s resources. 7.1 Website/Microsite The Town currently has a stormwater specific webpage (https://www.lexingtonma.gov/277/Stormwater- Management) which will be used as the hub for information related to this Outreach Plan. The webpage includes general stormwater information and how residents can participate in the Town’s stormwater management program. The website will be enhanced with more specific information related to SCM inspection and maintenance as well as MS4 General Permit compliance efforts. The webpage will serve as a repository for all content created as part of this Outreach Plan, as applicable, and will be updated frequently with program updates. Not all key audiences will have web access; therefore, outreach materials must also be made available in other media formats (see sections below). Webpage users will be able to subscribe to get updates on information that may interest them. 7.2 Link to Lexington Newsletters The Town issues weekly digital newsletters referred to as the Link to Lexington covering topics including general Town news, sustainability, the Town’s library, recreation, and boards and committees. These newsletters are emailed to approximately 4,000 subscribers (as of May 2024). Newsletter articles will be developed and distributed that are specific to stormwater and will be tailored to the audience type of each individual newsletter. The timing of newsletter articles will be based on the publication dates of existing Town of Lexington, MA (027871.16) 5 Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 newsletters and will be developed to complement related content. Potential timing and topics of newsletter articles include: • Annually in the spring timeframe to provide general information about stormwater and water quality, and the importance of stormwater infrastructure – information that is relevant to all Town residents. • As needed to announce upcoming community events or meetings. • Prior to a stormwater retrofit project being developed or implemented. 7.3 Flyers/Brochures/Fact Sheets Our team will create handouts that can be used to provide information on stormwater management, instructions for inspection/maintenance of SCMs, and requests for annual inspection/maintenance documentation. These handouts may be in the form of flyers, brochures, or fact sheets. These materials will be available on the Town’s stormwater webpage and in public spaces (such as the library), distributed during events, and provided to property owners with known SCMs. The materials will be updated as necessary to remain relevant and accurate. 7.4 Reverse 911 The Town utilizes Code Red, a reverse 911 system for important communications. As of May 2024, this tool provides the Town access to 32,000 contacts across email, phone calls, text messages, and mobile alerts. The tool provides the capability for very targeted outreach, down to a specific household. The Town has successfully used Code Red to inform residents about canvassers. This tool will be used sparingly but can be used to notify residents of important stormwater-related information and how they can learn more. Examples could include warnings of local flooding or alerts of harmful algal blooms. 7.5 Social Media Social media will be utilized to disseminate information such as stormwater management and water quality protection messages, and to advertise upcoming events. The Town currently uses Facebook, X (Twitter), and Nextdoor for social media. Posts will be concise and will direct users to the Town’s stormwater webpage to learn more. Videos can be used on social media to clearly explain the importance and benefits of stormwater management and SCM maintenance. The social media platform to be used will be selected in coordination with the Director of Communications. 7.6 Community Events Information can be disseminated to key audiences during Town community events including but not limited to Discovery Day, Patriots’ Day, Department of Public Works (DPW) Week, and Farmer’s Markets (which occur weekly throughout the summer). During these community events, tables/booths can be set up providing event goers the opportunity to talk to Town staff and receive stormwater related handouts and materials. In some instances, materials can be provided for a table without requiring staff to attend. Relationships with schools and NGOs can be leveraged to staff community events as described in Section 7.10. Town of Lexington, MA (027871.16) 6 Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 7.7 Presentations to Town Select Board / Committees In order to keep Elected Officials apprised of the Town’s ongoing water quality, flood management, and stormwater efforts, the Engineering Department will take the lead in providing updates (verbally and through written materials and/or presentations) to the Town’s Select Board at meetings. This will help local elected officials better understand the Town’s stormwater program’s community benefits. The Select Board meets every two weeks. In order to be added to the agenda, advanced notice must be provided to the Town Manager. Town staff will prepare a summary and presentation and provide it to the Town Manager’s office in advance of the meeting. The Engineering Department will provide general status updates to the Select Board on an annual basis or more frequently, if needed. Presentations may also be provided to Town committees. Town committee members are not always elected officials but sometimes citizens or volunteers who have an interest in a specific topic. Presentations to these groups will be conducted as needed when stormwater information impacts or relates to that group’s interest. 7.8 Presentations at Public Meetings The Town will prepare and provide presentations to community groups and at public meetings to share general stormwater-related information as needed. These meetings could be project specific, regarding future updates to the Town’s stormwater program, and cover a variety of topics for various audiences. 7.9 Email Lists The Town has existing contact lists for property managers and landscapers. Interested parties will also be able to sign up for email lists via the Town’s stormwater webpage. Similar to the newsletter articles described in Section 7.2, email lists can be used to distribute information related to stormwater management, as well as meeting and event opportunities. 7.10 Coordination with NGOs, Committees, Schools The Town has existing relationships with NGOs, committees, and schools with interests overlapping with stormwater management. The Town has worked with Citizens for Lexington Conservation and Lexington Climate Action Network (LexCan) and will identify other NGOs to build relationships within the future. The Town will coordinate with NGOs, committees, and schools, participate in their activities and events if applicable, and meet with them one-on-one to foster coordination and collaboration. Recently, the Town initiated discussion with Jonas Clark Middle School in April 2024 to work with students to assist in stormwater-related outreach, communications, and events related to a specific stormwater project being undertaken by the Town. Throughout stormwater project planning and design processes, the Town can coordinate with school administrators to generate excitement, gain feedback, and identify planning team participants. Students can help with outreach at community events. Possible participants include Lexington High School or Minuteman High School students who need to earn volunteer hours and/or are interested in science. Town of Lexington, MA (027871.16) 7 Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 8. NEXT STEPS Implementation of this Outreach Plan is anticipated to commence immediately by initiating outreach to private SCM owners during Summer 2024. Next steps for priority actions to be taken by the Town include the following. • MS4 Permit Year 7 (July 1, 2024 – June 30, 2025): o Continue outreach to private SCM owners by scheduling in-person site visits; o Develop flyers, brochures, and fact sheets for various audience types to be available digitally on the Town’s stormwater webpage and as hard copies at community events; o Prepare newsletter articles to be published in various Town newsletters; o Post stormwater-specific communications on Town’s social media platforms; o Consider, prepare, and give stormwater related presentations to the Town’s Select Board; o Set up booths/tables at Town community events; and o Consider and foster partnerships with NGOs to support stormwater-related community events and educational opportunities. • Future MS4 Permit Years: o Continue engagement on, and maintain, outreach platforms, such as social media, Town’s stormwater webpage, and to the key audiences through various outreach mechanisms. Town of Lexington, MA (027871.16) Woodard & Curran, Inc. Strategic Stormwater Communication and Outreach Plan May 2024 APPENDIX A – KEY MESSAGES Town of Lexington, MA (027871.16) 1 Woodard & Curran, Inc. Appendix A: Key Messages May 2024 Town of Lexington – Key Messages Key Message 1: General Stormwater Information • Stormwater runoff results from rain or snowmelt flowing over hardscape surfaces such as roadways, sidewalks, parking lots, and rooftops. • Hardscapes, referred to as “impervious surfaces”, trap stormwater at the surface level; unable to access the soil and groundwater below. o Unlike forests, meadows, and grasslands which allow stormwater to infiltrate slowly into the ground, stormwater runs across these impervious surfaces before eventually entering directly into stream, river, lake, or pond. • When stormwater can’t soak into the ground, it becomes runoff, picking up and transporting pollution along the way such as: o Soil particles o Yard waste, like grass clippings and leaves o Materials associated with cars, like gas and oil o Litter and trash o Pet and animal waste o Pesticides and herbicides • Stormwater systems, collect, convey, and sometimes treat stormwater runoff from developed areas (buildings, parking lots, streets, and curbing) via catch basins, manholes, drainage pipes, and stormwater control measures, that eventually discharge to our local waterways. o Since these systems discharge directly into local waterways, managing them well protects our water quality and aquatic habitats. • Having working stormwater systems means: o We can maintain water quality and quantity – providing safe water for recreation, maintaining healthy wildlife habitats, and minimizing flooding. o We can improve maintenance – avoiding reactive repairs will save money and avoid road closures or disruption of other utility services. Key Message 2: Town-wide Stormwater Infrastructure • Stormwater management infrastructure, like catch basins, manholes, drainage pipes, and stormwater control measures, keeps our roads drivable, our buildings from flooding, our residents safe, and is probably something you never think about until it fails. • Challenges associated with stormwater management infrastructure include: o Aging, inadequate, and failing infrastructure like broken pipelines o Regulatory compliance, water quality, and resource management such as permitting o Changing climate creating undersized infrastructure where more rain falls during a single storm event than the system can hold o Operations and maintenance demands with sometimes limited staffing availability o Street sweeping and catch basin cleanings to keep debris from being caught up in stormwater or from storm drains getting clogged resulting in flooding Key Message 3: Stormwater Control Measures Town of Lexington, MA (027871.16) 2 Woodard & Curran, Inc. Appendix A: Key Messages May 2024 • Stormwater control measures (SCMs) are physical systems designed to capture/store and/or treat stormwater, and can include: o Dry detention basins o Infiltration basins o Wet ponds o Gravel/constructed wetlands o Porous pavement o Vegetated areas, especially those in trenches or low elevations o Rain gardens • Some of the stormwater control measures within Lexington are on Town property, but others are on private property. • Private property owners that have these types of facilities can help protect waterbodies and save the Town taxpayers’ money by maintaining and performing inspections of their stormwater control measures. Property owners can inspect and maintain their stormwater control measures by performing tasks like: o Mowing and landscaping o Debris and litter removal o Sediment removal o Structural integrity inspections o Water level inspections • Specific maintenance requirements depend on the type of SCM. • Private property owners with SCMs on their property will be required to report annual inspections to the Town. • To learn more about how you can help, visit the Town’s stormwater webpage (https://www.lexingtonma.gov/277/Stormwater-Management) or contact the Town of Lexington’s Engineering Department. Attachment 7: Updated SCM Retrofit Cost Estimate Budget Estimate Summary Date:6/30/2023 Stormwater Improvement Concept Estimates Time:8:55 AM Woodard & Curran Project No.:227871 41 Hutchins Drive Portland, Maine 04102 Labor Material Const Equip Subcontract Temp Matl Proc Equip Other Totals Direct Construction Cost % Base Labor $108,728 $151,057 $76,677 $59,550 $0 $503,000 $0 $899,011 Labor Burden 45.00%$48,928 $48,928 Labor Fringes $65,235 $65,235 Labor Manhours 2,644 Material Sales Tax 0.00%$0 $0 Const Equip Transportation 3.50%$2,684 $2,684 Subcontractor Bonds 0.00%$0 $0 Temporary Material Sales Tax 0.00%$0 $0 Process Equipment Tax/Freight 0.00%$0 $0 Other Markup 0.00%$0 $0 Gross Construction Cost $222,891 $151,057 $79,361 $59,550 $0 $503,000 $0 $1,015,858 General Liability Insurance 0.85%$11,390 $11,390 Builders' Risk Insurance 0.15%$2,010 $2,010 Overall Contractor Overhead & Gen'l Cond.0.00%18.00%18.00%18.00%18.00%18.00%18.00%18.00% $0 $40,120 $29,602 $14,285 $10,719 $0 $90,540 $0 $185,266 Trade Contractor Profit 0.00%10.00%10.00%10.00%10.00%10.00%10.00%10.00% $0 $22,289 $16,446 $7,936 $5,955 $0 $50,300 $0 $102,926 P&P Bonds $22,550 $22,550 $22,550 Total Construction Cost $285,300 $233,054 $101,582 $76,224 $0 $643,840 $0 $1,340,000 Design / Engineering ($50K x 3 sites)$150,000 $150,000 Permitting ($25K x 3 sites)$75,000 $75,000 Geotech. Investigation ($10K x 3 sites)$30,000 $30,000 Survey ($15K x 3 sites)$45,000 $45,000 Construction Admin.($15K x 3 sites)$45,000 $45,000 Bidding ($5K x 3 sites)$15,000 $15,000 Sub-Total $1,700,000 Design Contingency 25%$425,000 Sub-Total $2,125,000 Owner Contingency 20%$425,000 Project Total $2,550,000 Estimate Recap - Stormwater Improvement Concept Estimates Recap - With Taxes and Insurance ,Indirect Costs are Spread Group 1: Area Group 2: BMP Type Estimator : Kris Rosner Project Size : 0 SQFT Description Quantity UM Lab.Total Mat.Total Sub.Total Eqp.Total Process Equip. Tot.UnitCost TotalCost C:\Users\krosner\227871 Stormwater Estimates JUN2023.est Page 1 6/30/2023 08:58 AM Philip Road Separation and Filtration 101,726 41,268 15,061 33,009 1,152,179 1,343,243 * Total Philip Road 101,726 41,268 15,061 33,009 1,152,179 1,343,243 Jonas Clarke Middle School Enhanced Biofiltration System 86,815 55,837 2,824 23,564 110,449 279,489 * Total Jonas Clarke Middle School 86,815 55,837 2,824 23,564 110,449 279,489 Bowman Elementary School Gravel Wetland 345,110 238,755 47,066 136,572 767,503 Permeable Pavement 25,847 43,321 84,531 6,066 159,765 * Total Bowman Elementary School 370,958 282,076 131,597 142,638 927,268 Total Estimate 559,498 379,181 149,482 199,211 1,262,627 2,550,000