03/21/2019 SEWER COMMISSION Minutes

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4 Sewer Conunission Minutes March 21,2019 For initial review it was noted the Implementation Plan(WI`1MP/C1QYMP)was approved in 2015 with short term initiatives relative to the use of shellfish aquaculture for the adaptive management approach. In the 5-year Implementation Plan; 2017-2021, evaluations have been conducted regarding the potential use of Mashpee Commons and the Mashpee Wampanoag Tribe WWTF. The Town received$450,000 in nitrogen mitigation funds from the Cape Cod Commission to secure GHD, Inc. to proceed with preliminary site design at Site 4. Currently,there are(5)proposed phasing areas. Proposed areas for sewering in Phase I include Site 4 WWTF,Mashpee Commons WWTF,Windchime Point WWTF (possible re-build) and the Southcape WWTP. This phase also considers the continuation of the nitrogen remediation program with shellfish aquaculture and the evaluation of the Moonakis River. The design of the Site 4 WWTF in Phase I is planned as a modular facility for subsequent phases. At this site, the collection and pumping station would be situated. The target; Mashpee River watershed improvements. With groundwater discharge permitting there will be a requirement to develop a hydrogeological report to update the modeling. At this point expansion would be reviewed. It was noted there are various flow loads for the different phases. Sensitive receptors would be reviewed as well as access from the landfill side. Mr. Gregg defined the general wastewater process for treatment and handling as well as effluent recharge and disinfection. The cost of development is dependent upon technology selection, sewer service area size and modular design/phasing. It is projected that draft deliverables would be provided to the Town in September 2019. Value Engineering meetings will follow. Final deliverables should be presented and completed by December 2019. Upon completion of the preliminary WWTF final design the process would require groundwater discharge permitting, a hydrogeological report and the final design of phase I to include the collection system final design with survey, easements and pumping stations. In reviewing the mapping,it was noted there are continued discussions regarding the use of Joint Base Cape Cod for pump and treat on a regional basis with the Towns of Falmouth, Sandwich and Bourne. This is a key component. Discussion continued regarding the use of ocean outfall. It was noted the Town of Falmouth is considering this approach. Although there have been no determinations to date,the feasibility of an ocean outfall in the area of Buzzards Bay is a consideration for the Town of Mashpee and with neighboring towns in terms of cost sharing. With approval, GHD could evaluate the potential for an ocean outfall when considering Site 7. It was suggested this initiative move forward when discussions continue regarding the New Seabury/discharge area. To alleviate disruption in the road areas, it was recommended that Great Hay Road, a wooded area be use instead of Great Neck Road South. There is concern regarding contaminants beyond nitrogen, and the need to utilize carbon filtration. It was suggested the contaminants be acknowledged in the removal process to ensure clean water. The use of total organic carbon(TOC)was briefly discussed.