10/28/2019 BOARD OF SELECTMEN Minutes

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Board of Selectmen Minutes October 28, 2019 Presentation on Municipal Treatment Plant Technologies and Siting Considerations: GHD Engineering: (continued) Depending on flow, operation and typical maintenance, the life span of a treatment plant is 50 years. The Membrane Bioreactor(MBR) is a favorable option offering preliminary treatment; grit and screening, secondary/tertiary treatment, residuals management/solids handling and disinfection and flow metering. The MBR treatment process is capable of achieving TN 3 mg/L effluent without any additional downstream processes, and is capable of removing other contaminants. In considering Joint Base Cape Cod(JBCC) it was noted the leaching process to the canal is not a direct discharge to the canal. There is not an ocean outfall. In the oxidation process, JBCC pumps 12 miles toward the canal to sand beds, and there is a leaching process to the canal. With the regionalization of the 4 Upper Cape towns and possibly Barnstable the alternatives are large sand beds with various cost implementations and permitting requirements both on the federal and state levels with no guarantee that permitting would be obtained. When asked of the level of nitrates which ranges from 10 to 3 mg/L it was noted the Town of Falmouth is permitted for 3 mg/L total nitrogen and the Town of Chatham is similar. In terms of size the proposed Mashpee treatment plant; Site 4 would be constructed comparable to the Mashpee Commons wastewater treatment plant. To start staffing would most likely use one to two persons dependent upon the collection. Typically there is a lead operator and operations would encompass 3 persons and possibly two part-time persons. This could be a Town service or a contracted service. The Town of Chatham operates a contracted service. Currently four persons manage the collection system. Representatives from the Towns of Falmouth and Chatham are expected to give a presentation of the operation of their systems to include staffing levels. The Town of Falmouth system is run by the Town of Falmouth. Discussion followed regarding noise levels. New technology tends to reduce noise and odor from the site. At Mashpee Commons, the noise level is quiet. Additional funding could be expended to mitigate noise if it is so required. The Executive Summary of the GHD Report contains information regarding operations and maintenance. When asked if costs would be less expensive to have a regional plan as a centralized plan, it was noted that Mashpee has a decentralized system comprised of private facilities that service different clusters in Town. There is a need to treat other areas in Mashpee that do not have wastewater treatment, and as the other facilities age, they would need to be improved upon or incorporated into a larger system. This is a question to ask of the community. Do you compromise to take advantage of what you have to try to incorporate into the next step? Or, do you develop one large facility at a large cost with collection systems and maintenance. There is no real serious look at developing one facility for the Cape.