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TECHNICAL REPORT <br /> Mashipee,MA <br /> INTRQ�QUCTION <br /> A vacuum sewer system is a mechanized method of transporting wastewater. <br /> Divacuumfferential sewer air pr c <br /> essure reates flow rather an gravitsystem.y or pressure. Essentially, <br /> a system is a negative pressthure sewer <br /> Vacuum sewer systems require a vacuum station similar to a gravity lift station or <br /> pumping station. Unlike a lift station, vacuum Pumps maintain vacuum on the <br /> collection mains. To maintain this vacuum, a valve at each sewage input point <br /> seals the system. The valve opens automatically when a given quantity of <br /> sewage accumulates in a collection sump. This valve is entirely pneumatic in its <br /> control and operation. Differential pressure between local atmospheric pressure <br /> and the vacuum pressure provides the thrust needed for liquid transportation. <br /> The proposed collection system requires five vacuum stations. The wastewater <br /> will enter the vacuum system through AIRVAC valve pit packages. From the <br /> vacuum stations a common force main will carry the wastewater to the ultimate <br /> point of discharge. <br /> CONNECTIONS typically collects wastewater from many different <br /> A vacuum collection syslet" <br /> sources. Sources include residential, commercial, <br /> industrial, institutional, and <br /> recrmall ional areas. t is assum the Mashpee project area consists of residential <br /> or s eat commerciali service conn ed ections. A summary of connections is shown' <br /> hown in <br /> Table 1. <br /> Table I -Connections <br /> Service connections <br /> Vacuum system <br /> #1 325_ <br /> #2 <br /> #3 <br /> 1,010, <br /> #41 <br /> #5 630 <br /> 173,465 <br /> Total <br />