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J. H. KLEINFELDER & ASSOCIATES <br /> File No. 5-2568-4 <br /> November 11, 1983 <br /> Page 4 <br /> percolation holes were initially filled with water and allowed to soak for a period of <br /> 24 hours. The tests were performed by filling the hole with water to a fixed <br /> ,a referenced point and allowing the water to percolate for a period of one hour. Each <br /> hole was then refilled and the process repeated. The percolation test data is <br /> presented on Table L <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Site Preparation and Grading <br /> Site preparation should include stripping and removal of all vegetation and debris <br /> from the construction areas. The actual depth of stripping should be evaluated in the <br /> field by a representaive of J. H. Kleinfelder & Associates. After the site has been <br /> cleared, and before the placement of any Engineered Fill, the exposed surface soil <br /> within and to a minimum of 5 feet beyond the building areas, should be scarified to a <br /> minimum depth of 6 inches and recompacted. In building areas, the recommended <br /> degree of recompaction of the dark-brown silty clay soil is between 85 and 95 percent <br /> of the maximum dry density as determined by the ASTM D-1557-70 test procedure. <br /> This recompaction should be done at a moisture content at least 5 percent over <br /> optimum. If any soft or loose soil pockets are found in the site stripping or <br /> recompaction process, they should be overexcavated and recompacted. <br /> It is our opinion that Engineered Fill can consist of the native silt and clay soils <br /> obtained during the site preparation and street utility excavating. We recommend that <br /> native soils placed as Engineered Fill be spread in thin horizontal layers a maximum of <br /> 8 inches in loose thickness and compacted to between 85 and 95 percent of the above <br /> referenced dry density at a moisture content of 5 percent in excess of optimum. <br /> If construction is to be delayed, moisture conditioning need not be performed <br /> during initial site preparation. However, it is important that the recommended <br /> moisture content be achieved and maintained just prior to actual construction. Without <br /> proper conditioning, there is a greater risk that the predominately dark-brown clay <br />