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, <br />Job No. 487 L Page 2 <br />vt11 need <br />date. <br />inspecEion and possible stabilization at a later <br />The fill was placed in 4 inch lifts and compacted by <br />rneans of a 5 r x5 | sheepsfoot. roller atEached to a D-6 <br />bul-ldozer and by means of vheelrolling vith loaded scrapers <br />and a L,ater truck. The required noisture was supplied by a <br />3500 ga11on vater truck. <br />The fill naterial consisted of both on-si.te and iEported <br />so11s. The on-site material consisted of si1ts, sandy si1ts, <br />silty sands, and sands, vhile the inport consisted of s11ty <br />sand obtained from three sources. <br />The denslty of the soils was determined in accordance <br />rvith A.S.T.M. Test Methods D-1556 and D-2937. The test <br />results were compared to the naximun density as determined <br />in accordance with A.S.T.M. Test Method D-1557. The resultsof the tests are presented on the attached "Tab1e of Test <br />Results" with their approximate locations shown on the <br />attached plot p1an. <br />TeSES <br />conpacted70-') <br />for <br />soil <br />volune change L,i th moisture <br />in accordance with the <br />\Jere <br />UBC <br />performed on <br />Test Standard <br />The naxinun density of <br />accordance with A.S.T.M. Te st <br />the soil vas <br />Method D-1557. <br />determined in <br />Ln areas Eo <br />constructed <br />The concenEration of soluble sulfates in the soil was <br />det.ermined by A.S.T.M. Test Method D-516 Method A and is <br />expressed as a percentage by Ueight of dry soil tested. <br />REMARKS AND RECOMMENDATIONS <br />Footings and Bearing <br />Footings may be designed for an al1ovab1e bearing value <br />of 1925 pounds per square foot provided they are placed Eo a <br />Einimum width of 12 inches and a ninimum depth of 18 inches <br />below the lowest adjacent final grade. Thls value may beincreased by 300 pounds per square foot for each addltioDalfoot in vidth to a oaxinun value of 2825 pounds per square <br />foot. An increase of 1/3 of the above bearlng value is <br />permi ssible for shorE duration loadlng. <br />II iS <br />be covered <br />reconmended that coDcrete floor slabs <br />with troisture sensit.ive coverings be <br />I <br />LABORATORY TESTING <br />Concrete Slab Construction <br />t <br />I