3900 S Bristol St - Soils Report

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Page 5 LEROY CRANDALL AND ASSOCIATES soils may be combined without reduction in determining the total lateral re- sistance. Inspection The footing excavations should be carefully inspected to verify that the footings are founded in satisfactory soils. The clay soils are expansive, and footings extending into clay soils should be poured immediately after cleaning and inspection to avoid drying and cracking -of the foundation soils. All footings should be deepened where necessary to reach satisfactory soils and where necessary to extend below any dry or cracked soils. All necessary footing and utility trench backfill should be mechanically compacted; flood- ing should not be permitted. Also, the exterior grades should be sloped away from the building to prevent ponding of water adjacent to foundations. GRADING To provide improved support for the building floor slab and for foot- ings established in compacted fill, any existing fill soils and the upper natural soils should be excavated, and all required fill should be properly compacted. Because of the expansive nature of the upper soils, a layer of relatively non-expansive and predominantly granular soils is recommended be- neath the building floor slab and beneath any adjacent walks and slabs. - .1 After stripping any existing vegetation, any existing fill soils within the building area and in areas to be paved should be excavated. Next, the upper natural soils within the building area should be excavated to a depth of at least two feet below the existing grade, but not less than two feet below the planned subgrade level (bottom of floor slab). The excavation of the natural ...................