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November 18, 1999 <br /> Job Number- S"307 <br /> Page 6 <br /> The surface and near surface soils located on the site are reported to be the San Joaquin- <br /> Urban land complex(Plate 7). The San Joaquin soil is described by the Soil Survey report as <br /> "moderately deep to a hard pan and moderately well drained. Typically, the surface layer and the <br /> upper part of the subsoil are brown loam about 16 inches thick. The next 10 inches of the subsoil <br /> is a clay pan of brown clay. The lower part to a depth of 60 inches is a brown and light brown <br /> indurated hardpan. In some areas the surface layer is silt loam. Permeability is very slow in the <br /> San Joaquin soil and runoff is slow. The rate of water intake to irrigated areas is about 1 inch/ <br /> hour.i' The following is an excerpt of the engineering properties for the following soil. <br /> Table of Selected Soil Properties of the San Joaquin-Urban land Complex <br /> Soil Name and Depth(in) Unified Soil Salinity Soil Septic tank <br /> Map Symbol Classificatio mmhos/cm Reaction absorption <br /> n pH fields <br /> San Joaquin-Urban 0-16:Loam CL-ML,ML <2 5.6-6.5 Severe: <br /> land complex,0 to 16-26: Clay loam clay CL <2 6.1-7.8 cemented pan <br /> 2 percent slopes. 26-660: Clay loam,clay -- -- --- peres slowly. <br /> 242 <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> A soil boring was drilled to a depth of 10 feet to characterize the soil profile of the site. <br /> No ground water was encountered to a total depth of 10 feet. Generally, a stiff brown-orange <br /> silty fine sand was encountered to the total depth of 10 feet (Plate 8). No hardpan was <br /> encountered during drilling. <br /> Two percolation tests were performed adjacent to and within the exploratory boring. <br /> These holes are 2.0 feet and 10.0 in depth and within soils consisting of silty fine sand (Plate 8). <br /> The 2.0 foot peculation test casing was installed in a separate 2.0 foot hole 3.0 feet from the 10 <br /> foot soil boring. The 10 foot percolation test casing was installed within the 10 foot soil boring <br /> hole. Both casings were 2 inch PVC pipe with slots on the bottom. Two inches of"pea gravel' <br /> was placed in the bottom of each hole,the casings were installed, and several feet of"pea gravel' <br /> was backfilled in the annular space. <br /> 5 USDA Soil Conservation Service, Soil Survey of San Joaquin County,California, Sheet 6. <br /> PERS y <br /> SSS OGS <br />