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- 19 - <br />new location to determine bearing conditions. Structure type, <br />configuration and bearing elevation should be generally known for • <br />final reocn¢nendation. <br />WASTE WATER TREF-TMESTP PLANT <br />We understand the proposed treatment plant will be a pre- <br />engineered type system. Subsoils encountered at the proposed plant <br />site consist of a shallow aepth of silty to clayey sand Overlying <br />medium to coarse alluvial material. A free water level was encoun- <br />tered at depth'10 feet. Spread footings placed on the upper sands or <br />underlying medium to coarse river run material can be used for support <br />of the structures. Allowable ~~ressures may be taken as 2,000 psf on <br />the upper sands and 5,000 psf on the underlying granular soils. <br />Settlements under these pressures should range to a maximum of 1 inch. • <br />Minimum footing width should be taken as 16 inches for walls and 2 <br />feet for columns. Continuous foundation walls should be reinforced <br />top and bottom to span an unsupported length of at least 10 feet. Any <br />buried walls should be designed to resist an equivalent lateral earth <br />pressure. of 35 psf per foot of Depth. This assumes a compacted and <br />relatively free-draining granular backfill. On-site coarse granular <br />soils should be suitable for use as backfill provided oversized rock <br />is reproved. Exterior footings should be placed belay frost depth. <br />ACCESS/HAULiiL1AD <br />The roadway will extend from the lower northeast portion of the <br />site to the future coal refuse area above the site to the southeast. • <br />