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CASCADE TESTING L{1�ORATORY, INC. <br />TESTING fL INSPGCTION/GNGWGERS/GEOLOGISTS <br />December 16, 1981 <br />Cert. No. 8112-13G <br />Paper Warehouse Corporation <br />Page 9 <br />soils engineer. Comnact the select backfill in loose lifts not to <br />exceed ten (10) inches to a minimum density of 98� of ASTM D-1557 <br />test procedures. As previously stated, to achieve maximum compac- <br />tion, the moisture content of the structural backfill should not <br />�iary +2 percent of optimum moisture as established by ASTht D-1557. <br />Footings placed to bear on the dense non-yielding structural fill <br />may be designed to a maximum allowable soil bearing value of 2000 <br />PSF. This value is based on total compliance with our section on <br />Structural Fill and the following: <br />1) All continuous footings should be a minimum of eighteen (18) <br />inches in width. Then proofroll the parking area to check for <br />soft soil conditions. All soEt sails should be removed and <br />replaced with a compact structural fill. <br />2) All footings should bear a minimum of eighteen (18) inches below <br />finished adjacent exterior grade for frost protection. <br />3) All footings should be nominally reinforced to resist stress. <br />� Parking Areas <br />� Parking areas should be prepared prior to placement of the subgrade <br />_ f,ill. This preparation sf�ould include the removal of all surficial <br />�organic rich, loose, oi root ladened soil, debris, and standing <br />_ water. <br />� 1) Backfill the parking area with fill material conforming to Wasf�- <br />ington State Flighway Specification 9-03.10 Class A or equivalent <br />� as approved by the soils engineer. Compact the select backfill <br />- in loose lifts not exceeding twelve (12) inches to a minimum <br />� density of 92� of ASTM D-1557 test procedures. ' <br />� <br />