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L u v <br /> LMarch 25,2005 <br /> NOA Project Number: E05005A <br /> ` boring to a depth of 16 feet. The soil borings were used later for percolation test holes;the <br /> locations of the borings are indicated in Plate 1. <br /> 5.2 Soil Boring Dimensions <br /> The soil borings were 16 feet or three feet deep,as noted above, and were four inches in diameter. <br /> 6. 5.3 Soil Lithology Observed <br /> L Generally, the soil encountered in the boring is similar to the soils reported by the San Joaquin <br /> County Soil Survey for the area (USDA, 1992). Table 4 presents a soil log for the 16 foot deep soil <br /> boring. Conditions were comparable in the shallow hole. <br /> L Table 4. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-7 Medium brown,moist clayey fine sand SC <br /> 7-15 Light brown,moist,silty fine sand with clay SM <br /> 15-16 Gray cemen d SM <br /> (auger refusal at 16 feet <br /> 5.4 Discussion of Soil Lithology <br /> 4 A visual inspection of the shallow and deep soils from on-site drilling indicates little potential for <br /> percolation because of both the fine grained and cemented nature of the soils. A percolation test is <br /> the best method to determine the suitability of the soils. The layer at 16 feet was found to be hard <br /> cemented silty fine sand which our drilling equipment was not able to drill beyond. The deep <br /> percolation test was performed at the 16 foot depth because of the auger refusal. Please see the next <br /> L section for percolation test results. Generally speaking, sandy soils have much greater potential for <br /> percolation than fine-grained or cemented soils. <br /> G <br /> L <br /> L <br /> !L <br /> 6 <br /> L .*44 <br /> L <br />