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r T�"'�Y-� F 'T '!" L'�•-y'-�a� h'tE �n �' f 1"'"iX .Cll� �� �� :�.A FC41A'"'F'� g�.y�} <br /> ASFESSMENT REPORT <br /> Shell oil company <br /> 2726 Tracy Boulevard,Tracy.California <br /> Delta Project No.40-80-015 <br /> Page 8 <br /> i <br /> TABLE 3 <br /> Hydraulic Conductivity Values From Slug Test Data <br /> Well Depth to Soil Type at and Below (Y,draulic Conductivity <br /> jj?— Water(ft) the Water Table ft/day cmisec <br /> MW-1 9.45 Sandy silt to 14.7 5.1 x 10"3 <br /> silty sand <br /> MW-2 9.31 Clayey silt to 20.7 7.3 x 10-3 <br /> silty sand <br /> MW-3 11.15 Sandy silt to 34.3 1.2 x 10"2 <br /> silty sand <br /> Soil samples were collected from soil boring SB-8 at depths of 16 and 20 feet. The soils were taken <br /> from below the water table and were classified as silty sand and sandy silt, respectively. The soils <br /> were sent to the :aboratory for sieve analysis to determine grain size distribution (Appendix D). <br /> - Grain size distribution was analyzed by equations developed by Hazen and Krumbein and Monk to <br /> - estimate hydraulic conductivity. The hydraulic conductivity of the silty sands collected at a depth <br /> of 16 feet averaged 5 feet per day, whereas, the sandy silt collected at a depth of 20 feet averaged <br /> 1.5 feet per day(Table 4). <br /> -, <br /> TABLE 4 <br /> r" Hydraulic Conductivity Values From Grain Size Analyses <br /> Hazen Analysis . Krumbein & Monk <br /> Roil Sample <br /> Boring Depth (ft) Soil Tvoe ft/da v pec fr/dav cM/sec <br /> SB-8 I6 <br /> Silty sand 4.53 1.6 x 10"g 5.89 2.0 x 10"3 <br /> SB-8 20 SP-idy silt 2.55 9.0 x 10-4 0.26 9.2 x 10-s <br />