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<br />CONCLUSIONS <br />1) The alluvial fan soils encountered at the site consist of a <br />combination of sandy clays and clayey to silty sands and <br />gravels with cobbles and boulders. The subsoils are medium <br />dense to dense and stiff to hard. Groundwater was not <br />encountered to the rtiaximum depth drilled, 71 feet. <br />2) Foundations for the dewatering structure and thickener may <br />consist of isolated spread footings, a mat or driven <br />piling. Testing of soil samples taken from the site <br />indicates the upper soils generally possess moderate bearing <br />capacity and erratic settlement/heave characteristics. <br />Providing structural fill below shallow footings should help <br />reduce foundation movement. P. heavily reinforced mat, box <br />type spread footing or deep piling should also reduce <br />foundation movement potential. <br />3) Development of the site will require a considerable amount of <br />grading. The on-site soils should be acceptable for use as <br />structural fill. Fill embankments should be compacted to the <br />jab specifications and tested by a representative o£ the <br />geotechnical engineer. Discussion concerning design and <br />construction as related to geotechnical aspects of the site <br />are presented in the body of the report. <br />Chen &Associates <br />