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- 18 - <br />Based on the subsoil conditions and proposed construction, we <br />recommend the use of spread footings placed on the natural mist clays <br />below all topsoil. The footings may be designed for a maximum bearing <br />pressure of 3,000 psf. Under this pressure, we estimate settlements <br />to be on the order of 1 inch. Some additional differential ttovement <br />should be anticipated if subsoils were to become wet. Continuous <br />foundation walls should be reinforced top and bottom to span an <br />unsupported length of at least 10 feet. Any buried structures should <br />be designed to resist an equivalent lateral earth pressure of 45 psf <br />per for the depth. This assumes a ox~acted hackfill sloped away from <br />the structure aryl rn buildup of hydrostatic pressures. Exterior <br />foundations should be placed below frost depth. If wnsiderable site <br />filling is required to achieve foundation bearing level, the fill <br />• should consist of nonexpansive; granular material oxnpacted to at <br />least 1008 of ASTM D-698 dry 6ensity. <br />i~TER S'ILURA(~ TAI~IIt <br />we understand the tank site has been troved d~wnslope of the <br />original location presently indicated as the powder magazine. <br />Subsoils encountered at this location consisted of approximately 19 <br />feet of stiff to very stiff cl~r:~ interbedded with bedrock material <br />overlying hard to very hard clai•si:one/sandstone bedrock. At this <br />location spread footings placed on the natural soils designed for a <br />maximum bearing pressure of 4,000 psf or a graded pad designed for <br />uniform bearing of the tank could be utilized for support. We <br />. reommend that additional exploratory drilling be accomplished at the ~ <br /> <br />