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i July 29,2003 Job Number:'LG03-222 Page 5 damage, and cancer.. The use of DBCP was discontinued in' 1979. The Environmental Protection. Agency(EPA) set the maximum contaminant limit(MCL) at 0.2 parts per billion (ppb)because the EPA believes that given present technology and resources, this is the lowest level to which water"systems can reasonably be required to remove this contaminant should it occur in drinking water. 7.0 GEOLOGY,-SOHS,AND PERCOLATION TEST The surface geology at the site is shown on R. W. Page's (1986) map and is composed of Miocene to Hotocene'continental rocks and deposits (Plate 4). According to the trap, this unit contains"poorly sorted clay,silt, sand, and gravel; some beds of claystone, siltstone, sandstone, and conglomerate." The surface and near surface soils located.at site are reported to be composed of El Solyo clay loam, Capay clay, and Vernalis clay loam(Plate 3) (USDA,- 1993):. Table 3 presents some selected properties of the three soil types located on the property. Table 3. . . . Selected Soil Properties of the Surrounding Area San Joaquin County Soil Survey'Report. [[S:oilName and Map Depth(in) Unified Soil Salinity Soil Septic teak Symbol Classification mmhoslcm Reaction absorption PH fields El Solyo clay loam,0 0-10: Clay loam. ML, CL <2 6.6 -7.8 Sevcre` to 2 percent slopes, 10-60: Silty-clay loam, ML,MH, CL, <4 7.4-8.4 pares slowly. 156. silty clay. CH Capay clay, 0-20:.Clay. CH,.CL <2 6.6-8.4 Severe: 0 to 2 percent slopes, 20-60: Clay, silty clay. CL, CH <2 6.6 -8.4 peres slowly. .118- Vernalis 18_Vernalis clay loam,, 0-9: Clay loam_ CL <2 6.6-8.4 Severe: 0 to 2 percent slopes, 9-47:Loam, silt loam, CL, CL-ML <2 7.4 -8.4 peres slowly. 268. clay loam. 47-60: Stratified sandy CL, CL-ML <2 7.9-8,4 . r loam to silty clay loam. Note`. The table descriptions do not necessarily reflect site-specific soil properties. I . rr r