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Section 4 <br />Alternatives <br /> <br />The Adams Creek basin represents a large portion of the growth corridor that <br />exists between Mt. Pleasant and the City of Concord. The basin is planned to be <br />almost entirely low- to medium-density residential in the future. The population <br />is expected to reach 13,800 by year 2000. As presented earlier in this report, the <br />average daily flow is expected to reach 1.34 mgd. <br /> <br />The following presents alternatives for serving the Adams Creek basin. These <br />include implementing an interceptor system to convey flow to Mt. Pleasant <br />Pump Stations No. 1 and 2 and the No Action alternative. <br /> <br />4.1 Adams Creek Interceptor <br />The Adams Creek interceptor has been designed by Dewberry & Davis in two <br />phases. Phase I consists of 30-, 10-, and 8-inch interceptors. The 30-inch main <br />interceptor begins south of South Halifax Street and terminates at the wet well of <br />Mt. Pleasant Pump Station No. 2. The 30-inch interceptor is approximately 9,200 <br />feet in length. The smaller pipe represents two branch sewers serving the Pasture <br />pump station and Summer Street pump station. Both the Pasture and Summer <br />Street pump stations will be abandoned once the Adams Creek interceptor is <br />complete. <br /> <br />Phase II consists of 30-, 24-, and 8-inch interceptors and is approximately 20,000 <br />feet in length. This interceptor connects into the Phase I Adams Creek <br />interceptor. It allows for the abandonment of both the Food Lion pump station <br />and the Mt. Pleasant High School WWTP. <br /> <br />The design criteria used to design the Adams Creek interceptor is presented <br />below: <br /> <br />· Slope: Varies and is 0.0025 foot/foot for the 30-inch interceptor <br />· Marming's Friction Factor (n): 0.013 <br />· Peaking Factor~: Qp,~ = 3.89 x Q~vg°'m <br />· Design Period: Design to meet build-out flows <br />· Flow Depth to Pipe Diameter: Maximum of 1.0 <br /> <br />Dewberry & Davis's calculations for the Adams Creek interceptor are included in <br />Appendix C. <br /> <br />The 30-inch Adams Creek interceptor has a capacity of 13.3 mgd flowing full. <br />The estimated peak flow per Dewberry & Davis is 12.6 mgd at build-out (see <br />Appendix C). Using the peaking relationship presented above, the year 2020 <br /> <br />Peaking factor per Water and Sewer Authority of Cabarrus County, <br />Wastewater System Master Plan, Boyle Engineering Corporation, 1995. <br /> <br />C[~M Camp Dresser & McKee <br /> <br />11 <br /> <br /> <br />