2018-06-27-CEC-ATM-rpt (Combined Report with Updates & Errata)

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CAPITAL EXPENDITURES COMMITTEE REPORT TO 2018 ATM(incorporating Updates&Errata) quality of Lexington's streams and ponds. $70,000 is estimated for compliance with the construction related portions of the National Pollutant Discharge and Elimination System (NPDES) minimum control measures as mandated by the EPA in the storm water general permit. An estimated $270,000 will be used to repair/replace drainage structures encountered during road construction, repair other drainage areas of concern in the town and improve storm water issues discovered during NPDES investigation work. Areas of drainage concern that are under investigation and analysis include the Oxbow/Constitution Road area, Wildwood Road/ Wood Street area, Augustus Road area and Webster Road area. Illicit discharge detection has been ongoing in the Vine Brook and Mill Brook areas where contamination has been identified. The pre-emptive repair of existing drainage structures will reduce damage to structures themselves, existing pavement and private and public property." (Brown Book XI-23) More information about this project is in the section titled Programs, Public Works, Stormwater Drainage and the NPDES, on Page 24. Project Description Amount Funding Committee Recommends Requested Source (c) Comprehensive Watershed GF (Free Stormwater Management Study and $390,000 Cash) Approval (6-0) Implementation "DPW, Engineering and Conservation collaborate on this annual capital request which addresses drainage/brook management issues. The request funds the continuing design and implementation of watershed plans and the construction of priorities established in those plans. Staff has reviewed three watershed plans already completed (Charles River, Shawsheen River and Mystic River) and developed a prioritization schedule with built-in flexibility pending unforeseen changes. Requested funding will be used to move forward with those prioritized areas. Pleasant Street drainage has been completed and the Whipple Brook area design is ready for permitting and expected to go to construction in calendar year 2018. Significant progress has also been made in the evaluation of the Valleyfield area. Long- term benefits of the program include prevention of property damage, reduction in liability and overall improvement to the health of Lexington's waterways." (Brown Book XI-23) More information about this project is in the section titled Programs, Public Works, Comprehensive Watershed Stormwater Management Systems on Page 25. Project Description Amount Funding Committee Recommends Requested Source (d) Townwide Culvert Replacement $390,000 GF (Free Approval (6-0) Cash) "This request is part of an ongoing program to replace culverts that are at or near failure. Of the funding requested, $250,000 is estimated for construction costs necessary for culvert replacement, $65,000 is for design, permitting and bidding and the remainder is for contingency. On-going culvert inspections continue to reveal a need for the replacement program as many older culverts are failing. This program is a companion effort with the ongoing Watershed Management Plan. The Oxbow/Constitution Road area is undergoing preliminary evaluations. Detailed design evaluation is complete for Valleyfield and Waltham Street at Clematis Brook; planning, final design, permitting and construction will follow. Proactive replacement of townwide culverts prior to failure will allow for proper design considerations and funding while also minimizing the impact to residents through unexpected road closures and flooding." (Brown Book XI-24) More information about this project is in the section titled Programs, Public Works, Culverts on Page 25. 46