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I" KLEINFELDER File No.: 20-3304-01 February 1, 1990 Page 6 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 vegetation and any debris from the areas of construction. The stripped 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 buried objects should be overexcavated and recompacted. After stripping and removal of vegetation 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 loose or soft pockets of soil or debris encountered during this process should be overexcavated and recompacted, free of debris. Any fill required to bring the site to finished grade should consist of on-site soils or imported granular nonexpansive soil having a maximum percentage passing the #200 ' Sieve of 40 , a maximum Plasticity Index of 8, and a minimum Resistance-Value (R-Value) of 40 . Such imported fill should be compacted at a moisture content at or near optimum. We recommend that samples of any proposed imported fill soil be 1