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Home My WebLink About2021-01-04-CONCOM-min JS MORNIN ?�G 2=W ,O O ,Q PUBLIC MEETING MINUTES Conservation Commission APRIL tY— Meeting broadcasted by LexMedia LFXING'�O� AGENDA Monday,January 4, 2021, 6:3 Op.m. Pursuant to Governor Baker's March 12, 2020 Order Suspending Certain Provisions of the Open Meeting Law, G.L. c. 30A, §18, and the Governor's March 15, 2020 and subsequent Orders imposing strict limitation on the number of people that may gather in one place, this meeting of the Lexington Conservation Commission will be conducted via remote participation to the greatest extent possible. Specific information and the general guidelines for remote participation by members of the public and/or parties with a right and/or requirement to attend this meeting can be found below. No in-person attendance of members of the public will be permitted, but every effort will be made to ensure that the public can adequately access the proceedings in real time, via technological means. In the event that we are unable to do so, despite best efforts, we will post on the Town of Lexington website or through LexMedia an audio or video recording, transcript, or other comprehensive record of proceedings as soon as possible after the meeting. This Conservation Commission meeting was held remotely via Zoom, an online meeting platform. Public Participation via calling in or using your computer was encouraged. Commissioners Present: Philip Hamilton, David Langseth, Kevin Beuttell, Alex Dohan, Ruth Ladd, Duke Bitsko and Holly Samuels Staff Present: Karen Mullins, Conservation Director and Meghan McNamara, Department Assistant 6:40 PM New Business/Pendine Matters Issue Certificate of Compliance: 10 Springdale Road, ViewPoint Cloud Permit# COC-20-18, DEP# 201-1123, BL# 1080 On a motion by Mr. Beuttell and seconded by Ms. Samuels, the Commission voted 7-0 by roll call vote to issue the Certificate of Compliance, subject to a compliance site inspection by Ms. Mullins. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:41 PM Issue Order of Conditions: 4 Maguire Road, ViewPoint Cloud Permit#CNOI-20-28, DEP4201- 1201 On a motion by Ms. Ladd and seconded by Mr. Langseth, the Commission voted 7-0 by roll call vote to issue the Order of Conditions. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:43 PM Issue Order of Conditions: 607 Waltham Street, ViewPoint Cloud Permit# CNOI-20-31, DEP4201-1202 It was brought to the attention of the Conservation Commission from the Planning Board that 607 Waltham Street may not be a building lot under zoning bylaw, due to available upland square footage (Section 4.2.1 for developable site area: 4.2.3 Developable Site Area). The applicant has agreed to a later issuance of the Order of Conditions until the zoning problem is resolved. If a change is required, the Commission will ask the applicant to request the hearing be reopened. 6:47 PM Request for an Extension to the Order of Conditions from 2/5/2021 to 2/5/2022: 20 Pelham Road, ViewPoint Cloud Permit# EXTO-21-1, DEN 201-1082, BL41039 On a motion by Ms. Samuels and seconded by Ms. Ladd, the Commission voted 7-0 by roll call vote to approve the one year extension to the Order of Conditions. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:48 PM Issue Partial Certificate of Compliance: 20 Pelham Road, ViewPoint Cloud Permit#COC-20-29, DEP4201-1082, BL41039 This request for Partial Certificate of Compliance will be issued during the next meeting of the Conservation Commission. Issue Certificate of Compliance, 48 Lincoln Street, ViewPoint Cloud Permit#COC-20-33, DEP4201-1174, BL420-4 On a motion by Ms. Dohan and seconded by Ms. Ladd, the Commission voted 7-0 by roll call vote to issue the Certificate of Compliance, subject to a compliance site inspection by Ms. Mullins. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:50 PM Ratify Emergency Certificate, 67 Turning Mill Road, ViewPoint Cloud Permit# EC-20-7, Water line break repair On a motion by Ms. Dohan and seconded by Ms. Ladd, the Commission voted 7-0 by roll call vote to ratify the emergency certificate. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:51 PM Issue Partial Certificate of Compliance: 207 East Street, ViewPoint Cloud Permit#COC-20-30, DEP4201-0945, BL4903 This will be continued to the next meeting on January 19, 2021 to allow Ms. Mullins more time to review the request for Certificate of Compliance. Issue Certificate of Compliance: 151 Grove Street, ViewPoint Cloud Permit# COC-20-31, DEP4201-1095, BL41052 This will be continued to the next meeting on January 19, 2021 to allow Ms. Mullins more time to review the request for Certificate of Compliance. 6:52 PM Request for an Extension to the Order of Conditions from 1/22/2021 to 1/22/2022: 7 Crosby Road, ViewPoint Cloud Permit# EXTO-20-7, DEP4201-1079, BL41036 On a motion by Ms. Samuels and seconded by Ms. Ladd, the Commission voted 7-0 by roll call vote to approve the one year extension to the Order of Conditions. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:53 PM Request for an Extension to the Order of Conditions from 2/25/2021 to 2/25/2022, 0 Rangeway ViewPoint Cloud Permit# EXTO-20-8, DEN 201-968, BL4926 On a motion by Mr. Langseth and seconded by Ms. Ladd, the Commission voted 7-0 by roll call vote to approve the one year extension to the Order of Conditions. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:54 PM Issue Partial Certificate of Compliance: 21 Revere Street, ViewPoint Cloud Permit# COC-20-32, DEP4201-1151, BL41107 On a motion by Ms. Ladd and seconded by Ms. Dohan, the Commission voted 7-0 by roll call vote to issue the Partial Certificate of Compliance, subject to a compliance site inspection by Ms. Mullins. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:55 PM Issue Certificate of Compliance: 11 Vine Brook Road, ViewPoint Cloud Permit# COC-20-22, DEP4201-1113, BL41071 On a motion by Ms. Ladd and seconded by Mr. Langseth, the Commission voted 7-0 by roll call vote to issue the Certificate of Compliance. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 6:56 PM Appoint 2 Conservation Commission member liaisons to the Recreation and Conservation Working Group for 5-year Project Planning and Prioritization Mr. Beuttell has experience in this area and has agreed to join this working group. Mr. Hamilton asks that if any other member of the Conservation Commission would like to join to please get in touch with him. 6:58 PM Hartwell Innovation Park Zoning Initiative Comments The Conservation Commission will hold a meeting on January 11, 2021 to discuss and generate comments for the Hartwell Innovation Park, Hartwell Ave Rezoning Initiative. Approve Minutes: 11/30/2020, 12/14/2020 These minutes will be approved during the next meeting of the Conservation Commission. Schedule site visits for 1/19/2021 meeting The site visits will be scheduled for Saturday, January 16, 2021. Reports: Bike Advisory, Community Gardens, Community Preservation Committee, Greenway Corridor Committee, Land Acquisition, Land Management, Land Steward Directors, and Tree Committee Mr. Langseth will be providing possible dates for a Stormwater working/learning session. Mr. Bitsko was notified that there has been nefarious activity at Willards Woods, including idling of trucks and cars, drug use, and a dog being poisoned by cannabis that was left on the ground. Ms. Mullins has notified the police and the park ranger with the license plate and other information. 7:06 PM (29:30:00 for LexMedia Recording) New Public Meetings/Hearings ViewPoint Cloud Permit# CNOI-20-33, DEP# 201-1204 Notice of Intent, 0 Massachusetts Avenue (Arlington Reservoir) Applicant: Town of Arlington Parks and Recreation Commission Project: The Arlington Parks and Recreation Commission proposes the Arlington Reservoir Renovation Project Phase II, which includes parking area improvements, installation of new ADA-accessible pathways, new recreational facilities, a boat launch, bathing beach improvements, bank stabilization measures, and invasive species control/upland habitat restoration. Documentation Submitted: — "Arlington Reservoir-Phase 2: 100% Design Development Set", Sheet G-Sheet 5.0; Prepared for: Town of Arlington; Prepared by: Kyle Zick Landscape Architecture; dated November 13, 2020 — "Notice of Intent" and attachments; Prepared for: Arlington Parks and Recreation Commission; Prepared by: SWCA Environmental Consultants and Kyle Zick Landscape Architecture; dated December 2020 • Description of Project; "Arlington Reservoir Project"; Prepared by: SWCA; dated December 11, 2020 • "WPA Form 3 —Notice of Intent" application; dated November 12, 2020 • "Notice of Intent Narrative"; dated December 2020 • Figure 1: USGS Topo; dated November 6, 2020 • Figure 2: Aerial Map; dated November 12, 2020 • Figure 3: "Arlington Reservoir Bank Survey"; dated August 6, 2020 • Site Photographs; dated July 17, 2020 — "Stormwater Management Report"; Prepared by Woodard & Curran; Signed and stamped by: Denise L. Cameron, PE Civil No. 53548; dated October 2020 • Appendix E: "Operations and Maintenance Plan"; dated October 2020 — Memo from Michael Sprague, Engineering to Karen Mullins, Conservation; Re: "0 Massachusetts Ave—Arlington Reservoir"; Dated 1/4/2021 Mr. Beuttell recused himself from the hearing as he is working on another project with the Arlington Parks and Recreation Commission. Mr. Bitsko also recused himself as he is working on a project with the Arlington Conservation Commission. Danielle Desilets, representative from Kyle Zick Landscape Architecture, presented before the Commission and was joined by Joseph Connelly, Director of the Town of Arlington Parks and Recreation Commission, Rebecca Weissman and Mickey Marcus, Environmental Consultants with SWCA, and Denise Cameron and Bradley Mustain, Civil Engineers with Woodard and Curran. Questions from the Commission: — How much of the system is in Lexington? — It appears that the trail north of the beach is being relocated away from the Reservoir, is this correct? — Why can't the trail be moved perhaps 10 feet away to allow for re-vegetation of existing areas and removal of invasive species? There are many areas where the trees are not an issue. Responses from the Applicant: — None of the parking is in Lexington. Only part of the beach area and trail are in Lexington — The trail is shifting mostly on the Lexington side, a couple of feet upland to minimize the impact to the existing trees. Want to shift the trail material away from the bank. — There is a cost-balance because we are working with existing trails. Looking at that where we can as much as possible. Referring to plans L1.1 and L2.1, Ms. Desilets described that there are alternate pathways being shown on the left side of the plans from the connection on Lowell Street. The goal is to have as much of this trail accessible as possible. Ms. Desilets added that they are taking the connection that shows towards the beach side and creating a connecting point between the existing trails, and, although it will require regrading and removal of vegetation, it is mostly burning bush. It will use a portion of the existing trail but make a connection closer to the beach area, and when the beach is open, there will be an accessible connection up to Lowell Street. Referencing the Lexington Engineering report, Mr. Mustain confirmed that they did follow the existing conditions for the areas in Lexington. Mr. Hamilton suggests that it would benefit the applicant to get together with the Engineering Department to clarify the items on the memorandum. Mr. Marcus asks that the Lexington Conservation Commission coordinate with the Town of Arlington on the issuance of the Orders of Conditions, if and when approved. Mr. Marcus would like the orders to match, so that there will be just one set of conditions for the Contractors to work with. Ms. Mullins confirmed that she will work with the Town of Arlington to make this happen. Ms. Desilets will provide a highlighted plan to show where the trails are shifting. On a motion by Ms. Ladd and seconded by Ms. Samuels, the Commission voted 5-0 by roll call vote to continue the hearing to the January 19, 2021 meeting at the applicant's request. Record of vote as follows: Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye Mr. Bitsko and Mr. Beuttell both recused themselves from the discussion and vote. 7:36 PM (59:05:00 for LexMedia Recording) ViewPoint Cloud Permit#AOOC-20-13, DEP#201-1190, CNOI-20-20 Amendment to Order of Conditions, 11 Norton Road Applicant: Speedwagon Partners, LLC Project: Expansion of the approved covered porch located along the front(western) facade resulting in a 140+/- square foot increase in impervious surface. Documentation Submitted: — Letter Describing Requested Amendments;prepared and signed by Richard Kirby, LEC Environmental; dated December 15, 2020 — Site Plan dated July 15, 2020 and revised through December 4, 2020;prepared by: Frederick W. Russell, PE — "Stormwater Analysis" and "Operation and Maintenance Plan";prepared and signed by Frederick W. Russell, PE; dated July 15, 2020 and revised through December 4, 2020 — Memo from Michael Sprague, Engineering to Karen Mullins, Conservation; Re: "11 Norton Rd AOOC Comments"; Dated 1/4/2021 Mr. Richard Kirby, Wetland Scientist with LEC Environmental, presented before the Commission. This request for an amendment to the Order of Conditions is due to the buyer of the house wanting more outside seating in the form of a wraparound porch on the front left corner of the house. Project Engineer Frederick Russell redesigned the rear infiltration system to accommodate the runoff from the additional impervious area, and did so by increasing the amount of stone surrounding the unit. Questions from the Commission: — Is the dimensional change related to the infiltration system, essentially making it two feet longer, reflected on the revised plan? Responses of the Applicant: — The bed was lengthened and the plan shows a 34 foot dimension that would have previously been 32 feet. Ms. Mullins brought to the attention of the Commission and Mr. Kirby that the distance from the side yard to the porch, 11.5 feet, may be from the original plan. The application for an Amended Order of Conditions does not go to the Zoning Board for review, so Ms. Mullins suggested that the Commission not close the hearing until that is resolved and confirmed. On a motion by Ms. Dohan and seconded by Ms. Ladd, the Commission voted 7-0 by roll call vote to continue the hearing to the January 19, 2021 meeting at the applicant's request. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 7:45 PM (1:08:28 for LexMedia Recording) ViewPoint Cloud Permit# CN0I-20-34, DEP#201-1205 Notice of Intent, 52 Hartwell Avenue Applicant: Eversource Energy Service Co. Project: the installation of approximately 2,028 linear feet of new underground duct line to bring additional electrical circuits from Eversource's existing Hartwell Substation 533 on Hartwell Ave to the MIT Lincoln Laboratory facility on Wood Street in Lexington, MA. Documentation Submitted: — "MIT-LL 4th Feeder Infrastructure Upgrade Project: Environmental Resources Map" map set; Sheet 1, 2, 3, 4 of 4; Prepared for: Eversource Energy; Prepared by: SWCA Environmental Consultants; dated December 11, 2020 — "Notice of Intent: MIT Lincoln Laboratory Infrastructure Improvement Project" and attachments; Prepared for: Eversource Energy; Prepared by: SWCA Environmental Consultants; dated December 2020 o Description of Project; "Eversource MIT Lincoln Laboratory Infrastructure Upgrade Project"; dated December 15, 2020 o "WPA Form 3 —Notice of Intent" application; dated December 14, 2020 o Notice of Intent Narrative; dated December 2020 o Figure 1: USGS Topographic Figure o Figure 2: Ortho Imagery Figure o "StreamStats Report - Stream SA"; dated December 15, 2020 o "Horizontal Directional Drill Contingency Plan" — "Stormwater Management Report" Technical Memorandum; Prepared for: Lexington Conservation Commission; Prepared by: Rebecca Weissman, Natural Resources Team Lead, SWCA; dated December 15, 2020 Ms. Becky Weissman, SWCA Environmental, and James Clancy, Eversource, presented the project to the Commission. Eversource is proposing to provide additional electrical supply from the existing substation on Hartwell Avenue to the MIT Lincoln Laboratories. The conduit will be installed by a variety of methods. From the entrance driveway to beyond the Minuteman bike path, 665 linear feet will be installed by Horizontal Directional Drill (HDD), a trenchless method used to avoid impacting certain environmental resources. Also, from this point to an existing manhole, 878 linear feet will be installed by conventional open trenching. The majority of this project is within existing roadway; however, a small portion connects to a manhole that is just off the roadway, but still within the road layout. Eversource is using two manholes, one on Wood Street and another located at the intersection with Maguire Road. Questions from the Commission: — Why take such a turn northward on Hartwell Avenue, to go right back southward? — Are the drilling muds constrained within the entry/exit area as shown? — Does the contingency plan include issues related to fuel spills? — Will the excess material be hauled away? — Are we concerned about wetlands west of Wood Street? Responses from the Applicant: — There are existing manholes on Hartwell Avenue that Eversource will need to connect conduits to. — Will discuss with the engineers and provide an answer at a later date. — Yes, the HDD contingency plan says they will keep mud storage tanks on site. — Typically Eversource will haul it off immediately to an appropriate location, however will ask the Engineers. — Did not identify wetlands close to Wood Street. The proposed work ends just off of Wood Street, and any wetlands appear to be over 100 feet away. Referencing the Memo provided by the Engineering Department,there are questions on the construction schedule and they are concerned about a new water line that is not shown on the plans. Also, the Engineering Department would like to be included in the coordination of work as there are other projects going on in the area. Ms. Weisman responded saying that they will discuss with the Engineering Department and also confirm the location of the water main as well. On a motion by Mr. Langseth and seconded by Mr. Beuttell, the Commission voted 7-0 by roll call vote to continue the hearing to the January 19, 2021 meeting at the applicant's request. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 8:02 PM (1:25:30 for LexMedia Recording) ViewPoint Cloud Permit# CN0I-20-35, DEP#201-1206 Notice of Intent, 20 Ingleside Road Applicant: Richard F. Perry Family Trust Project: raze and rebuild a single-family dwelling and associated site appurtenances. Portions of the proposed activities are located within the 100-foot Buffer Zone to Bordering Vegetated Wetlands (BVW). Documentation Submitted.- - ubmitted:— 20 Ingleside Road Planset; Sheet 1, 2 and 3, of 3; Prepared for: RFP Family Trust; Prepared by: Meridian Associates; Scale: 1"=20' and NTS; dated December 14, 2020 — "Notice of Intent Application and Wetland Resource Area Analysis"; Prepared by LEC Environmental Consultants Inc; Prepared for: Richard F. Perry Family Trust; dated December 15, 2020 o "WPA Form 3- Notice of Intent" application; signed and dated December 9, 2020 o Figure L USGS Topographic Quadrangle o Figure 2: FEMA Flood Insurance Rate Map o Figure 3: MassGIS Orthophoto &NHESP Estimated Habitat Map o "Wetland & Buffer Zone Mitigation Planting Plan"; dated December 10, 2020; Prepared by LEC Environmental Consultants, Inc. — "Stormwater Analysis and Calculations"; Prepared for: RFP Family Trust; Prepared by: Meridian Associates; Dated December 14, 2020 — "Operation and Maintenance Program"; Prepared for: RFP Family Trust; Prepared by: Meridian Associates; Dated December 14, 2020 Mr. Richard Kirby, Wetland Scientist with LEC Environmental, and Michael Capachietti, Project Engineer, presented before the Commission. The applicant is proposing to raze and rebuild a single family dwelling, portions of which are within the 100 foot buffer zone to Bordering Vegetated Wetlands, and is proposing to install erosion control, stormwater management, and wetland and buffer zone restoration. Questions from the Commission: — Why don't the Feno markers continue to the northern property boundary? — Why don't the Feno markers continue to the property boundary to the west, along the 25 foot buffer zone? Responses from the Applicant: — Extended the Feno markers to the northern property boundary and stopped them at the existing lawn edge. If the Commission would like to continue them along the existing lawn edge to the southern property boundary the applicant could do that. — Can do that as well, extend to the 25 foot no disturbance zone, however that could give the owner the false impression that they could clear beyond that. Mr. Bitsko, who was not present during the site visit, asked other members of the Commission their opinion on the location of the Feno markers. Ms. Dohan responded that, if anything, it would be to the south along the limit-of-work line, which isn't a requirement but it would make more sense to protect the area. Ms. Mullins added that the Commission does have the ability to require this because of the 50 percent rule. Mr. Kirby responded saying that they can add three more. Ms. Kathy Pan, abutter and property owner of 22 Ingleside Road, was present and had questions for Mr. Kirby and the Commission. Ms. Pan asked what the purpose of the infiltration system (PSIS) along the driveway was. Mr. Kirby responded that, with a new house, the Conservation Commission requires the applicant to collect the rainwater that runs off the impervious area and put it into the ground to imitate a more natural system through a series of pipes and treatment trenches underground. Ms. Pan also asked if she will have more water flow on her side of the property and Mr. Capachietti responded that his job is to make sure there is no additional runoff to adjacent properties. He noted they cannot take credit for the existing surfaces. Lastly, Ms. Pan asked if the removal of the tree on the northern part of the property will create more runoff, to which Mr. Kirby responded that the existing tree is pretty much dead and that a lot more runoff will be collected by the infiltration system. Mr. Langseth mentioned that there is a line labeled "PTEC" on the site plan, and requests that this be referenced on the legend as "Proposed Telephone Electric Cable". Ms. Samuels would like to see something more substantial than the Feno markers, perhaps a wall or stone, as it is tempting to keep the lawn a nice, rectangular area. Mr. Capachietti responded that he did add additional grading as a 3:1 slope from the edge of the existing lawn, and a small depression will overflow into the wetland. There won't be mowing in the area as it will be at a lower elevation. On a motion by Ms. Dohan and seconded by Mr. Langseth, the Commission voted 7-0 by roll call vote to close the hearing. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 8:19 PM (1:42:35 for LexMedia Recording) Continued Public Meetings/Hearings ViewPoint Cloud Permit#AOOC-20-11, DEP#201-1137, BL#1094 Amendment to the Order of Conditions, 127 North Street Applicant: Ying Chen and Katherine Van Stry, Bull Realty LLC Project: Changes include an impervious driveway instead of porous pavement as originally proposed and approved; modified stormwater management system; removal of an additional tree. Previous Meeting Date: 12/14/2020 Supplemental Documentation: - "Drainage/Grading Plan", dated May 15, 2019 and revised through December 14, 2020 (Sheets C-0 and C-1)prepared by Gala Simon Associates, Inc., signed by Alberto M. Gala, PE Civil No. 36434 On a motion by Mr. Langseth and seconded by Ms. Ladd, the Commission voted 7-0 by roll call vote to close the hearing. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye On a motion by Mr. Beuttell and seconded by Ms. Samuels, the Commission voted 7-0 by roll call vote to approve the amendment to the Order of Conditions. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 8:21 PM (1:44:55 for LexMedia Recording) ViewPoint Cloud Permit# NOI-20-32, DEP#201-1203 Notice of Intent, 72 Grassland Street Applicant: Venkat Mannem Project: Construct an addition to a single-family dwelling and wooden deck, within the 100-foot buffer zone. Erosion controls and stormwater management are proposed, and wetland and Buffer Zone restoration to improve existing site conditions. Previous Meeting Date: 12/14/2020 Supplemental Documentation: — "StreamStats Report for 72 Grassland Street, Lexington, MA";prepared 12/14/2020 — "Drainage Plan", prepared by Gala Simon Associates, Inc., signed by Alberto M. Gala, P.E Civil No. 36434; dated 11/3/2020 and revised through 12/29/20 — "Engineering Drainage Calculations for 72 Grassland Street",prepared by Gala Simon Associates, Inc., signed by Alberto M. Gala, dated 11/3/2020 and revised through 12/28/20 Mr. Richard Kirby, LEC Environmental and Al Gala, Project Engineer, presented to the Commission the revised plans and stormwater report. Mr. Kirby stated that they added a 5 foot crawl space (elevation 209.94) as opposed to a full foundation, and that a small area will need to be created for the utilities in the basement. He also stated that the top of the peat is being used as the estimated seasonal high groundwater table and that the infiltration system remains unchanged. The size of the infiltration system in the front of the house has increased to incorporate the runoff of the entire existing dwelling, porous pavers will be put in place of the existing driveway, and mitigation efforts have increased rather substantially. Mr. Gala added that all the impervious surfaces are proposed to be infiltrated, and they are trying to keep the drainage system above the groundwater, especially in the rear. Questions from the Commission: — Referring to the retaining wall and replication area, is everything behind or North of the retaining wall or is there some other delineation between the usable lawn and wetland replication? — Neighbors are concerned about flooding. Has there been any update on lowering the elevation? — Where is the wall? Responses from the Applicant: — The replication area comes within a couple feet of the retaining wall. There is a small area of what could be lawn between the wall and the Feno markers. — Going to remove the lawn area to lower the elevation. During the preconstruction meeting, could dig holes to determine how far out the contractor can go. — The wall is just above 212.7+ and goes along the side of the property. From the bottom of the wall to the wetland line is 6 feet. Mr. Hamilton, agreeing that the neighborhood has a lot of flooding, believes that asking for a basement or asking for 5 feet of crawl space is too much. Mr. Kirby responded that the basement is finished and the property owner does not have much of a flooding problem, and that the crawl space would be higher than the existing basement. Mr. Hamilton responded that the back of the house is more likely to be impacted by rising water as it is much closer to the wetlands. Mr. Kirby stated that the addition is beyond the 25 foot zone and a foot above the elevation of the wetland boundary. Ms. Ladd and Ms. Dohan both opposed, agreeing that the "no build zone" is for the safety of the homeowner and health of the wetland. Mr. Kirby asked the Commission if a 4 foot crawl space, two feet above the wetland elevation, be agreeable? Mr. Langseth stated that, as long as the basement does not extend into a zone that displaces groundwater, he does not think it will have much of an impact on flooding, although the sump pump does present a degree of uncertainty. He added that if the groundwater analysis is correct, then putting the 5 foot crawl space won't participate in the groundwater system. His understanding is that the structure above the ground is preventing infiltration and that it is being addressed by the infiltration system. Ms. Samuels asked about the foundation below the crawl space. Mr. Gala responded that they don't have detail on the footing but it is still above any groundwater. Mr. Hamilton said that he is interested in Mr. Langseth's perspective on the groundwater and would lean more in favor of a shorter crawl space in the area that may or may not have high groundwater at certain times of the year. Members of the Commission raised concern about the conversation for the next project within similar buffer zone boundaries. The Commission has declined proposals for projects of much smaller scale that extend into the same buffer zone. Mr. Beuttell shared his opinion that it would feel inconsistent to allow a big developer to build within the 25 foot"do not disturb" zone and not to allow this project, considering the substantial mitigation proposed. Mr. Kirby ended the discussion saying he will need to return to the applicant and have a discussion on the crawl space and the location of the utilities. On a motion by Mr. Beuttell and seconded by Mr. Langseth, the Commission voted 7-0 by roll call vote to continue the hearing to the January 19, 2021 meeting at the applicant's request. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 9:07 PM ViewPoint Cloud Permit# CN0I-20-30, DEP#201-1200 Notice of Intent, 18 Winthrop Road Applicant: Donald and Elizabeth Briggs, Property Owners Project: Proposed construction of garage and living space addition to a single-family dwelling, new driveway and walkway, stone surface deck and stone patio, and conduct site grading and build a retaining wall. Portions of addition, deck, patio, site grading, and retaining wall are located within the outer portion of the 100-ft Buffer Zone to a Bordering Vegetated Wetland. Erosion controls, stormwater management, and wetland and Buffer Zone restoration are proposed. Previous Meeting Date: 11/30/2020, 12/14/2020 Supplemental Documentation: — "18 Winthrop Rd NOI Comments 2"; From: Michael Sprague, Engineering, To: Karen Mullins, Conservation; dated 12/18/2020 On a motion by Mr. Langseth and seconded by Ms. Samuels, the Commission voted 7-0 by roll call vote to close the hearing. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 9:09 PM On a motion by Ms. Dohan and seconded by Mr. Beuttell, the Commission voted 7-0 by roll call vote to adjourn the meeting at 9:15 PM. Record of vote as follows: Duke Bitsko —Aye Kevin Beuttell—Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye Respectfully Submitted, Meghan McNamara Conservation Department Assistant Approved: 1/19/2021 Submitted: 1/20/2021