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November 19, 2004 <br /> NOA Project Number: E04107A <br /> FiDBCP is a nematocide and soil fumigant for vegetables and grapes. It is thought to cause health <br /> problems consisting of kidney damage,liver damage, and cancer. The use of DBCP was <br /> discontinued in 1979. The Environmental Protection Agency (EPA) set the maximum contaminant <br /> limit (MCL) at 0.2 parts per billion (ppb) because the EPA believes that given present technology <br /> and resources, this is the lowest level to which water systems can reasonably be required to remove <br /> this contaminant should it occur in drinking water. <br /> 4.6 Well Water Sample Collection, Handling, and Transportation <br /> The samples were collected in a clean plastic container, then decanted into clean,glass vials. The <br /> samples were then transported o,n ice and remanded under chain of custody to Precision Enviro- <br /> Tech, Stockton. <br /> 4.7 Chain of,Custody <br /> Y <br /> The Chain of Custody document has been included in the appendix of this report. <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is in an area of the Modesto Formation. According to the Geologic Map of the Late Cenozoic <br /> 01 Deposits of the Sacramento Valley and Northern Sierran Foothills, California, this unit consists of Pleistocene <br /> alluvium from distinct alluvial terraces and some alluvial fans and abandoned channel ridges. It is <br /> comprised of tan and light-gray gravely sand, silt and clay except where derived from volcanic rocks <br /> of the Tuscan Formation; then it is distinctly red and black with minor brown clasts. <br /> r The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Survey <br /> to be composed of Stomar clay loam, 0 to 2 percent slopes (Plate 3) (USDA, 1992). Table 2 <br /> presents some selected properties of these soils: <br /> Table 2. <br /> —San Joaquin County Soil Survey— <br /> Selected Soil Properties of On-Site Soils. <br /> F1Soil Name Depth Unified Soil Classification Salinity Soil Perme- Septic tank <br /> and Map (in) mmhos/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> F. I 5tomar clay 0-17: Clay loam;Cl <2 6.6-7.3 .2-.6 Erodes <br /> loam,0-2 17-47: Clay loam,clay;CL,CH <2 6.6-8.4 .06-.2 easily,peres <br /> slopes, 47-60: Clay loam,silty clay loam;CL <2 7.4-8.4 .2-.6 slowly <br /> G 252 <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> P <br /> 6 <br />