3/15/1997 SEWER COMMISSION Minutes

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MASHPEE SEWER COMMISSION MELTING MINUTES SATUR AY, MARCH 15, 1997 MASH MASHPEF COMMONS SEWAGE TREATMENT PLANT Present: Torn Fudala, Dennis Bal arini, Brad C f yn Present at the tour were Commission members'. a representative from Team Engincefing- Steve Cushing , the firm which maintains the plant and residents of Stratford Ponds. Steve Cushing, the representative from Team Engineering explained the process. There is a pump station at North Market Street and another at Mashpee Commons Shopping Center. All the waste water is pumped up to the septic tank here, which is below grade. Each tank can hold 25,000 gallons. Presently they are only running l tank. They will start the second one in May. The plant is sized for 90,000 gallons per day. The flow now is about I -1 ,000 gallons per day. s it sized for any future development by Mashpee Commons? Steve is not sure of that. After the septic tanks,the wastewater then goes into an equalization tank. The flow is split between two rotating biological contactors -RBCs. You are able to see the bacteria,growth on the rotating tams, from thicker to thinner as the waste is broken down. How long does it tale for the waster water to go from one end to the other? 1e did not know because the water is re-circulated. Torn asked if they will be able to re-circulate at full capacity or is that a luxury now? They will still be able to re-circulate at full capacity. After the RBC, the waste water goes to the second clarifier where coagulants are added to capture the small particles in the water which don't settle. The coagulants will cause them to join together and makes it Baser to capture them in the sand filters. The clarifiers remove any particles. It pumps the sludge from the bottom and the clear water overflows the top. If it is not clear the sand filters will capture any particles. The sand filters have 6 different grades of sand, and are 5 feet deep. The sand does not have to be changed. There is an automatic backwash cycle which happens at least 1 time per day. After the sand filters, the ultra violet light sterilizes it. Bract asked if the solids which settle in the septic tank are pumped or do they leach out? The solids are removed about two tines per year. They are taken to another plant to be treated. Until then, it is held in an enclosed tank. Brad asked to what level sloes treatment occur here? To less than 10 parts of total nitrogen. Brad asked if he had any maintenance costs, for this plant and the willowtend plant(Team also maintains that plant . He explained that maintenance cosh are a concern to the Sewer