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September 27,2000 <br /> Job Number: LG00-312 <br /> Page 6 <br /> the EPA believes given present technology and resources, this is the lowest level to which water <br /> systems can reasonably be required to remove this contaminate should it occur in drinking water.' <br /> VI. GEOLOGY, SOIL,AND PERCOLATION TEST <br /> The geology of the Manteca area is reported to be Holocene to Miocene age Continental <br /> deposits that include poorly sorted clay, silt, sand , and gravel. Continental rocks and flood-basin <br /> deposits are common throughout the Central Valley. Locally, wind blown sand dune deposits <br /> occur are probably located at or near the site. <br /> The surface and near surface soils located at the proposed project location are reported to <br /> be the Delhi Loamy Sand (Plate 7). The Delhi Loamy Sand is described by the San Joaquin <br /> County Soil Survey report as"very deep and excessively drained. Typically, the surface layer is a <br /> grayish brown and light brownish gray loamy sand about 16 inches thick. The upper 10 inches of <br /> the underlying material is grayish brown loamy sand. The lower part to a depth of 60 inches is <br /> pale brown sand. In some areas the surface layer is loamy fine sand or fine sand. Permeability is <br /> rapid.i' The following is an excerpt of the engineering properties for the following soil. <br /> Table of Selected Soil Properties of the Delhi Loamy Sand <br /> From the San Joaquin County Soil Survey.' <br /> Soil Name and Depth(in) Unified Soil Salinity Soil Septic tank <br /> Map Symbol Classification mmhos/cm Reaction absorption <br /> PH fields <br /> Delhi loamy 0-16:Loamy sand. SM <2 6.1-7.8 Severe: poor <br /> sand, 0 to 2 16-26:Loamy sand, SM <2 6.1-7.8 filter. <br /> percent slopes. loamy fine sand. <br /> 142 26-60: Sand loamy sand SP-SM, SM <2 6.1-7.8 <br /> loamv fine sand. <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> ' EPA, 1999,Drinking water and health,National Primary Drinking Water Regulations,consumer fact <br /> sheet on: DIBROMOCHLOROPRPOANE. Internet: http://www.epa.gov./OGWDW/dwh/c-soc/dibromoc.html <br /> 5 USDA Soil Conservation Service, Soil Survey of San Joaquin County, California, Sheet 25. <br /> C ti <br /> �'�S p L♦ <br /> r <br />