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Job N0.487i Page 4 <br />In order to reduce the EaSRitude of settlement to the <br />generally accepted value of l/2 tnch ' the 8oi1 undcr the <br />iootlags shoul.d be removed and recompac Led. The grad 1n g v111 <br />be perforoed 1n accordance uit.h Ehe Gra d 1ng Speclflcations, <br />Lateral Soil Pressure <br />our opinton t.hat soils existlng on slte are <br />ad equa t e for backfill of r e ta ining va11s. <br />wi!h adequate <br />For purposeB of resisting lateral forces, an all-ovable <br />lateral so11 preseute of 25A pounds per square foot per foot <br />tray be used for Ehe buildlng design. A coefficient of <br />fr ict 1on of 0.43 Day be used for concrete placed directly on <br />the natural soils. These values may be used together for <br />reslsting lateral forces. <br />Retainlnq l,Ia 11 Desi en <br />Ret.alnlng ua11s Day be designed using the folloving <br />paraneiers: <br />Bearing - 2000 psf <br />Actlve earth pressure, leveI <br />Slidlng coef ftclent - 0.43 <br />Passive earth p r essure - 250 <br />backfill.32 psf /f r <br />pst /f r <br />IE is <br />consldered <br />L_ <br />I <br />Retainlng va11s shoul.d <br />drainage to control hydrostatlc <br />Expansive Soils <br />be provided <br />pressures. <br />tesLs j.ndlcate that the soils exlstlng on <br />1ov expanslon potentlal. The Les E resultsthe <br />are <br />The results ofsite possess <br />as f ol1ows: <br />B_i@1_2r 113.8 t6.t1 22 <br />No speclal construction is considered necessary for <br />expanslve soi 1s purPoses on this proJect, however, a final <br />d e Le rnina t ion wi 11 be mad e at the cotrplet.ion of grading. <br />Soluble Sulfa tes <br />The results of <br />concentratlons <br />as f o11ows: <br />Maxlmum <br />Denslty <br />tesEs shou <br />of soLuble <br />0p!lmum <br />Moisture <br />tha t the on-site soil s PossessBulfate6. The resul"Es of tests1ov <br />are <br />L <br />I <br />Location <br />Expanslon <br />fndex <br />I <br />L