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t <br /> �t <br /> February 3, 2005 - <br />? NOA Project Number: E040116A <br /> DBCP 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 /> 4.5 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 /> p , <br /> i samples were then transported on ice and remanded under chain of custody to Precision Enviro- <br /> Tech, Stockton. <br /> 4.6 Chain of Custody <br /> 1 <br /> The Chain of Custody document has been included in the appendix of this report.The chain of <br /> custody indicated the project name is Edwards property. The laboratory analytical results for the <br /> project name was checked and found to be mislabeled. <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> F1The Site is depicted on-the Geologic Map of the San Francisco - San Jose Quadrangle, California <br /> (1991), as within a region of Quaternary Fan Deposits. The unit is one of gravel, sand, silt and clay; <br /> outwash from the nearby mountains (Plate 7). <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Survey <br /> to be composed of Capay clay, 0.-2% slopes (Plate 8) (USDA, 1992). Table 3 presents some selected <br /> Fiproperties of the soil: <br /> Table 3. <br /> San Joaquin County Soil Survey— <br /> F1Selected Soil Properties of On-Site Soils. <br /> Soil Name Depth Unified Soil Classification Salinity Soil Perme- Septic tank <br /> and Map (in) mmhos/c Reaction ability absorption <br /> Symbol in pH (in/hr) fields <br /> Cspay Clay, 0-20: Clay:CH,CL <2 6,6-8.4 0.06-0.2 Severe:peres <br /> 0-2%slopes, 20-60: Clay,silty clay:CL,CF f <2 6.6-8.4 0.06-0,2 slowly,. <br /> 718. <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> Fi <br /> 6 <br />