6/15/2010 SEWER COMMISSION Minutes

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Site Visit by members of the Sewer Commission on June 10, 2010. Present: (Please sign in) The meeting convened at 4:35 PM at the clubhouse on the Wind Chime property. Several of the trustees of the condo association met us and after a brief introduction accompanied us to the on-site waste water treatment facility. The original septic system was retrofitted by an Amphidrome system which was adjusted to meet the existing field conditions. The available construction plans only indicate the mechanical system parts. No subsoil exploration data was given. The part-time technician explained the many variables which are recorded on computer print-outs. The original wastewater collection system conveyed all sewage generated by more than a hundred units to the location which appears to be the geographic low point of the area and is located close to Mashpee River. A series of ground water test wells have been installed surrounding the leaching facility which are located primarily down gradient of the soil absorption system and the westerly bank of Mashpee River. The operating cost per year is approximately$100,000 It appears that the test data recorded by computerized system does not comply with some of the test results obtained by samples retrieved from the ground water test wells. It is claimed(assumed)that the subsoil confluence of treated effluent from an adjoining waste water treatment facility which serves the Mashpee Commons etc. might account for the discrepancies. The initial conclusion is that the existing system serving Wind Chime Development is not suited to treat additional volume of sewage. Visit to Mashpee Commons Waste Water Treatment Facility. At approximately 5 PM the remaining commissioners were met by representatives of the Owners of Mashpee Commons. The waste water treatment plant is a duplex RBC type system which is one of the simplest technologies developed for clarifying sewage. Unlike the system for Wind Chime which major parts are buried below grade; the mechanical apparatus of the RBC system is housed in a climate controlled building. ply' Y Raw sewage is pumped from several commercial, residential and town government buildings which after passing through settling tank end up in a flow equalizing tank from which a measured constant flow of sewage flows into the RBC treatment units. The treated effluent is UV treated and also injected by Methanol to aid in de-nitrification. The clear effluent is dosed over an open leaching bed which is located in a fenced—in area and maintained to be free of biological growth. It was learned that the facility has additional capacity both for treatment and ground water disposal.