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File No. 20-3445-0•1 KLEINFEL DER March 4 , 1991 ripping, or displacing the membrane during construction. If the membrane becomes torn or disturbed, it should be removed and patched, or completely replaced in order for it to perforin its intended function. The membrane should be covered with approximately 1 inch of moist sand to protect it during construction and aid in curing the concrete. For the structure planned, we recommend that floor slabs be a minimum of 4 inches in thickness and be reinforced with at least wire mesh placed at midpoint in the slab. However, if heavy equipment or storage loads are planned, thicker floor slabs may be required. The actual floor slab thickness and reinforcing design should be provided by the structural engineer. Site Preparation and Grading Site preparation should include the stripping and removal of all vegetation and debris. The vegetation and debris should not be incorporated in any of the structural fills. The actual depth of stripping should be determined in the field by a representative of our firm. Voids left by the removal of any buried objects should be overexcavated and recompacted. After stripping and removal of vegetation and debris and before placement of any Engineered Fill, the exposed surface soil within and to a minimum of 5 feet beyond all building areas should be scarified to a minimum depth of 6 inches and be recompacted to a minimum of 90 percent of the maximum dry density as determined by the ASTM D-1557 test procedure at a moisture content near optimum. Any extremely loose pockets of soil encountered during this process should be overexcavated and recompacted. Engineered Fill required to bring the site to finished grade should consist of on-site soils or imported granular nonexpansive soil Copyright 1991 KLeinfelder, Inc. 6