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<br /> <br /> <br /> <br /> <br /> <br /> <br />a <br /> <br /> <br /> <br /> <br /> <br /> <br />r <br />n <br />i <br />t <br />Knight Piesold <br />COHSY LTINp <br />stilling basin. Two steel or concrete collars shall be welded to or cast against the outlet pipe, one <br />20 feet (minimum, 30 feet maximum) downstream from the upstream toe and the other 20 feet <br />(minimum, 30 feet maximum upstream) from the downstream toe. <br />3.1.3 Stilling Basin <br />A riprap stilling basin will be placed neaz the downstream toe of the embankment. The basin <br />serves to dissipate the energy of water flowing from the CSP riser outlet pipe, preventing <br />excessive erosion which may lead to dam embankment failure. The stilling basin will consist of <br />a riprap-lined (DSD of 6 inches) plunge pool. The stilling basin will be approximately 250 square <br />feet with an average depth of 3 feet below ground surface. <br />3.2 Access Maintenance Road <br />The 12-foot-wide access maintenance road will stem from the Sediment dam P4 site and will <br />terminate with a hammer head to the west of the relocated PS dam site. The hammer head will <br />serve as a turnaround and staging area. The road surface will consist of compacted native <br />material. Access road layout and typical cut and fill sections aze included on Figures 1, 2, and 5, <br />Project Layout, Plan and Profile of the Access Maintenance Road, and Typical Access Road <br />Sections and Details. <br />G:1101100100.01W1ReportsU(P\Dasign Report.000 5 <br />January 30, 2006 <br />