01/15/2019 BOARD OF SELECTMEN Agenda Packet

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z f4 f Executive Summary Preamble In June of 2014 the Draft Recommended Plan and Draft Environmental Impact Report (DRP/DEiR) was submitted as the third of four reports as part of the Town of Mashpee's Comprehensive Planning Process. It presented the recommendations of this planning process to address the nitrogen Total Maximum Daily Loads (TMDLs) established for Popponesset Bay and Waquoit Bay's eastern basin, it discussed the mitigation measures and implementation approach for Mashpee (and its neighboring communities within the project planning area) to address the needs as identified in previous documents. The Comprehensive Wastewater Management Plan (CWMP) is the culmination of multiple documents, the last of which is the Final Recommended Plan and Final Environmental Impact Report (FRP/FEIR or The Plan). This report is the last of four documents required as part of the Massachusetts Environmental Policy Act(MEPA)/Cape Cod Commission (CCC) Development of Regional Impact(DRI)joint review process. The Plan is the result of over 15 years of effort in examining Mashpee's needs and coordinating with the efforts of the Massachusetts Estuaries Project(MEP) and, most recently, the Cape Cod Commission's 208 Planning efforts. This has resulted in a 25-plus year implementation schedule allowing mid-course corrections to occur as part of the Adaptive Management part of the process. The Project Planning Area (PPA) includes all of Mashpee and portions of the neighboring communities of Barnstable, Falmouth and Sandwich that fall within the Popponesset Bay watersheds or eastern Waquiot Bay watersheds. The plan is predicated on the use of shellfish in the following areas: Popponesset Bay/ Popponesset Creek, Qckway Bay, Mashpee River and Shoestring Bay on the Popponesset Bay watersheds side and inHamblin Pond, Little River, Jehu Pond and Great River .on the Waquiot Bay side. Removal of the remaining balance of nitrogen will rely on a combination of traditional infrastructure (sewers), stormwater improvements through current best management practices (BMPs) and fertilizer reduction through the new bylaws/regulations in Mashpee and Falmouth. The traditional infrastructure is primarily focused in the Mashpee River watershed in Phase 1 with a shift to include the Quashnet/Moonakis River watershed in Phase 2. The efforts in the Quashnet/Moonakis watershed will depend on the findings of the proposed "soft solution" flushing analysis for the Moonakis River and, ultimately, the availability of Joint Base Cape Cod (JBCC) for a regional treatment solution. Monitoring and additional modeling are proposed for tracking performance throughout the 20-30 year planning period. The Adaptive Management Plan is backed by a "Plan B" option to consider full traditional infrastructure in the needed areas at build-out if increased future loads or lesser performance of the adaptive approaches are seen over the planning period. TMDL compliance/MEP modeling points will be used to track performance and allow for mid-course corrections through adaptive management. The estimated capital cost for Phase 1 is approximately $34 million, and, depending on shellfish performance and adaptive management, TMDL compliance is estimated between $220 and $360 million. 8612001.4 Town of Mashpee Sewer Commission ES-1 Final Recommended Plan/Final Environmental Impact Report