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-40- <br />FOUNDATIONS <br />Considering the subsurface conditions encountered in our test <br />pits, our experience with'similar soils and the nature of the proposed <br />construction, we recommend that the concrete vats and the solvent <br />extraction building be founded on spread footings bearing on the <br />natural soils and /or properly compacted structural fill material. The <br />following design and construction details should be observed for <br />spread footing foundations: <br />(1) Footings placed on the upper natural soils and /or properly <br />compacted structural fill material should be designed for a <br />maximum soil pressure of 3,000 psf and a minimum dead load <br />pressure of 1,000 psf. Under this pressure, we estimate that <br />total movement of the footings and the leaching vats will be on <br />the order of 1 inch with differential movements across the <br />proposed structures of less than 3/4 inch. <br />(2) Continuous foundation walls should be reinforced top and bottom <br />to span an unsupported length of at least 10 feet. <br />(3) Soft or loose soil pockets may be encountered within the loaded <br />depths of the footings and beneath the vat structures. These <br />materials should be removed when encountered and replaced with <br />properly compacted fill material or the footings should be <br />extended to adequate bearing material. <br />4) Exterior footings should be provided with adequate soil cover <br />above their bearing elevation for frost protection. Frost depth <br />for footings and underground utility lines is normally 30 inches <br />in this area. <br />