ARCHIVED REPORTS_LIMITED PHASE II ENVIRONMENTAL SITE ASSESSMENT AND SUMMARY OF PROJECT TO DATE

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November 16,2005 • NOA Project Number: E05120B The number of cows maintained on the Site appears to have fluctuated between 700 and 1,100. The dairy was closed on May 31,2005. A review of the dairy file at the San Joaquin County Environmental Health Department (EHD)is discussed in Section 5.3 of this report. 1.2 Soil According to the Soil Survey of San Joaquin County,California,'the Site is located on soils identified as Capay clay, 0 to 2 percent slopes, and Stomar clay loam, 0 to 2 percent slopes. These map units are described as follows: Capay clay, 0 to 2 percent slopes—This very deep,moderately well drained,nearly level soil is in interfan basins. It formed in alluvium derived from mixed rock sources... Typically,the surface layer is grayish brown and dark grayish brown clay about 20 inches thick. The subsoil to a depth of 60 inches is grayish brown, dark grayish brown, dark brown,and pale brown clay. The soil is calcareous below a depth of 20 inches. In some areas the surface layer is silty clay... Permeability is slow in the Capay clay... The shrink-swell potential is high... Runoff is slow,and the hazard of water erosion is slight... If this unit is used for homesite development, the main limitations are the slow permeability,low strength,and the high shrink-swell potential... Properly designing buildings and roads can offset the limited ability of the soil to support a load. Properly designing foundations and footings and diverting • runoff away from buildings help to prevent the structural damage caused by shrinking and swelling... Stomar clay loam, 0 to 2 percent slopes—This very deep,well drained,nearly level soil is on alluvial fans. It formed in alluvium derived from sedimentary rock sources... Typically,the surface layer is grayish brown clay loam about 17 inches thick. The upper 30 inches of the subsoil is brown clay loam and clay. The lower part to a depth of 60 inches is yellowish brown clay loam. The soil is calcareous below a depth of 17 niches. In some areas the surface layer is silty clay loam or loam... Permeability is slow in the Stomar soil... The shrink-swell potential is high... Runoff is slow, and the hazard of water erosion is slight... If this unit is used for homesite development, the main limitations are the slow permeability, the high shrink-swell potential,and low strength... Properly designing foundations and footings and diverting runoff away from buildings help to prevent the structural damage caused by shrinking and swelling. Properly designing buildings and roads can offset the limited ability of the soil to support a load... 'USDA Soil Conservation Service,1992,Soil Survey of San Joaquin County,California. • 2