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• Geotechnical Design Recommendations <br />The following are our recommendations for the design of the sedimentation retaining <br />structure. <br />1. The concrete retaining wall should be founded on the weathered sandstone <br />bedrock. The retaining wall should be keyed into the sandstone a sufficient depth <br />to provide passive resistance to sliding. The vertical portion of the wall should <br />also be a depth of 3 feet into the abutment walls <br />2. Geotechnical design parameters for the wall should be as follows: <br />• Sandstone <br />allowable bearing capacity (qa) = 10,000 psf <br />KP = 4.60 <br />density (y) = 145 pcf <br />friction concrete/sandstone (tan S) = 0.60 <br />• Sandy Silt with Clay <br />allowable bearing capacity (q,) = 4000 psf <br />Ke = 0.49 <br />Kp = 2.04 <br />density (y) = 120 pcf <br />• The maximum frost depth is approximately 40 inches <br />3 <br />