01/14/2019 BOARD OF SELECTMEN Agenda Packet

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4` ' � u Scenario 4—Fair Share reduction. Scenario 5—Centralized treatment approach. Each of these scenarios was modeled through the Massachusetts Estuaries Project (MEP) program for both Popponesset Bay and Waquoit Bay East. The findings were used in the development of Options 1A, 1B, and 1C as outlined in the 2012 Technical Memorandum presenting these options for addressing nitrogen in the watersheds. The ultimate goal of these new options was to advance the development of a Recommended Plan for nitrogen management within the PPA. Each option was modeled by the MEP to demonstrate feasibility to meet the TMDLs. The results of these rnodel runs were formally presented in the Final ASAR. The 2013 ASAR summarized the planning efforts performed to date, the model results and findings for the three proposed Options (1A, 1 B, and 1 C), and the technologies screened (as part of the 2007 Technology Screening Report). This document also summarized the framework for the Recommended Plan and identified the general categories of nitrogen removal that would be used to form the basis of the Recommended Plan. The ASAR identified these main categories to address nitrogen removal: • Source Removal. • Direct Environmental Mitigation, • Land Management Strategies. Using these categories the ASAR outlined a framework for the development of the Recommended Plan. The 2014 Draft Recommended Plan built upon this effort and evaluated alternatives to the Option 1A plan, including: Centralized vs. new cluster area treatment facilities a Regional Solutions m Existing Wastewater Treatment Facilities (WWTFs) g Traditional vs. Hybrid Solutions -- Primarily: o Shellfish Aquaculture — Secondarily: * Permeable Reactive Barrier(PRB) * Bog and Wetland Restoration * Onsite systems The evaluations and draft recommended plan are included in Chapters 4 and 5 of this report. 8612001.4 Town of Mashpee Sewer Commission ES-4 Final Recommended Plan f Final Environmental Impact Report