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` September 30,2002 <br /> Job Number:LG02-335 <br /> Page 5 <br /> level to which water systems can reasonably be required to remove this contaminate should it <br /> occur in drinking water.' <br /> VI. GEOLOGY, SOIL,AND PERCOLATION TEST <br /> `, The surficial geologic deposits near the site are reported to be composed of Pleistocene <br /> age(10,000 year to 2 million years ago)Modesto Formation. The Modesto Formation is old <br /> alluvium composed of sand, silt, and clay mixes. The site is reported to be located in an area <br /> composed of compact silt and very fine sand. The Modesto Formation is believed to be alluvium <br /> from glacial outwash deposits.' <br /> The San Joaquin County Soil Survey lists the surface soils at the proposed project <br /> location as Tinnin loamy coarse sand(Plate 7).6 For general background information,the <br /> following table presents some general engineering properties for the given soil. <br /> Table 2. <br /> Selected Soil Properties Located on the Site <br /> ' From the San Joaquin County Soil Survey (Plate 7). <br /> Soil Name and Depth(in) Unified Soil Salinity Soil Septic tank <br /> Map Symbol Classification mmhos/cm Reaction absorption <br /> pH fields <br /> Tinnin Loamy 0-28:Loamy coarse SM <2 6.1-7.8 Severe: <br /> coarse sand,0 to sand poor filter. <br /> 2%slopes,255. 28-53:Loamy coarse SM <2 6.1-7.8 <br /> sand,loamy sand <br /> 53-75:Loamy coarse SM <2 6.6-8.4 <br /> sand,loamy sand,sand <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> ` 4 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.hbnl <br /> ' Marchand,D.E.and Bartow,J.A., 1979,Geologic Map of the Cenozoic deposits of the Bellota <br /> ` quadrangle,California. Scale 1:62:500. <br /> 6 USDA Soil Conservation Service, 1992,Soil Survey of San Joaquin County,California, Sheet 27. <br /> ` '�pf R301 <br /> Q.S�i. <br />