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I I I I I I I I I -I I I I I I I I I I Transport Tire, Inc. -11- March 1,. 1983 Wi th each approach, in order to provide adequate protection from frost penetration, we recoomend that all exterior footings and footings in unheated portions of the structure have at least 4 ft of soil cover. Interior footings beneath heated portions of the structure should be embedded a minimum of 2 ft below the floor slab. A minimum embedment of 2 ft is required to provide adequate confinement to foundation base soils~ Floor Slab Design The floor slab can be supported on the existing fill soil. There is some risk of settlement in the floor slab area. We recommend that the surface of the floor slab subgrade be thoroughly compacted by. a large vibratory sheepsfoot roller to at least 95% of the maximum density obtained in accordance with ASTI1 Specification D-1557-70. We also recommend that all topsoils be s tripped from the floor slab area and that at least 1 ft of granular soils be incorporated into the floor base course to provide uniform support for the concrete slab. A recommended fill gradation is included in the Appendix of this report. This fill material should be compacted in accordance with the recommendations given above. Because of the variability of the fill materials encountered, the floor slab should be isolated from the foundation walls or columns (if any) as well as keyed at construction joints and reinforced with at least welded wire mesh in order to allow for minor differential movement to minimize cracking of the floor slab. Control joints should be provided at a minimum spacing of 20 ft. STS Consultants, Ltd.