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Er, mahony &associates, inc. tel. 781.982.9300 <br /> fax. 781.982.1056 <br /> water supply and pollution control equipment info@frmahony.com <br /> rme <br /> www.frmahony.com <br /> 273 Weymouth Street® Rockland,MA 02370 <br /> General <br /> Computations are based on the Hazen-Williams formula for friction loss, using <br /> calculations of cross-sectional area and flow rate to determine pipe sizes that create <br /> "self-cleaning" velocities of 2.0 fps or higher. A "C" factor of 150, SDR 11 HDPE <br /> pipe, and the average expected daily volumes for single family homes are also used <br /> in this analysis. <br /> Our normal recommendations for valve placement are as follows: flushing <br /> connections at 1,000' to 1,500' intervals and at branch ends and junctions; isolation <br /> valves at branch junctions; and air release valves at peaks of 25 ft or more and/or at <br /> intervals of 2,000 to 2,500 ft. <br /> Common practice in pressure sewers requires the ability to isolate each lot with a <br /> corporation stop off the main and service lateral kit to the lot line. These items are <br /> included in the budget analyses and shown in this report. We have used our <br /> outdoor model DH071-93 pumps in the budget. I have added 10% overhead and <br /> 10% contingencies to try to provide enough room in this budget for planning. <br /> Costs of pipeline excavation and pump installation were obtained from the Robert B. <br /> Our Company based on similar``projects. We have used a dig-lay and backfill <br /> budget with surface restoration. <br /> I am looking forward to working with you in your further efforts to develop a plan for <br /> the town of Mashpee. Please contact me if you have any questions or require <br /> additional information <br /> Best regards, <br /> Ed Quann <br /> President <br /> F.R. Mahony &Associates <br /> Enclosures <br /> 30 DuPaul Street 41 Bayberry Hill Road <br /> Southbridge, MA 01550 W.Townsend, MA 01474 <br /> tel. 508.765.0051 tel. 978.597.0703 <br />