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August 2002 -17- 003 -2203 <br />777 haul trucks traveled over the geomembrane. During fill placement, PVC grade markers <br />were placed at grade breaks and on a maximum 50 -foot by 50 -foot grid. After DCF ; placement, <br />PVC grade markers were removed, and Ames performed any additional grading required. <br />Ames placed DCF in an uphill direction on any slopes steeper than 411: IV. <br />2.9 Surface Water Diversion System <br />As part of the Phase IVa construction, the southern section of the Phase IV permanent surface <br />water diversion channel was constructed, as presented in Construction Drawings 8b through 8d <br />and Record Drawing 1. <br />The permanent surface water diversion channel consists of approximately 1,400 feet of <br />trapezoidal channel, 400 feet of 84" CSP, and 540 feet of 42" CSP. The channel section (depth <br />and width) and grade varies along the channel, depending on location. Along the channel <br />length, the channel bottom width varies between 12 and 15 feet, and the depth varies between <br />3.5 to 5.5 feet, and has 2.5H:1 V side slopes. The surface water channel was designed to safely <br />control and divert runoff resulting from the 100 -year, 24 -hour storm event from the contributing <br />upstream watershed area. The channel was designed to have flow velocities less than 5 feet per <br />second. Sections of the channel, upstream and downstream of CSP's, were riprapped to control <br />scour at the CSP entrance and exit. <br />JtiM203\OQMCtR4pC oM322030400.04740tn.&c Golder Associates <br />