Laserfiche WebLink
October 13,2004 <br /> ` NOA Project Number: E040109A <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 /> V14.5 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 /> "' samples were then transported on ice and remanded under chain of custody to Precision Enviro- <br /> Tech,Stockton. <br /> 'v`4.6 Chain of Custody <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 depicted on the USGS Geologic Map of the Cenotioic Deposits of the BellotaQuadrangle(1979) as <br /> within a region of Foothill-derived basin sediments and interdistributary overbank deposits. These <br /> map units consist of alluvial silt and clay (Plate 7). <br /> v <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 Stockton clay, 0-2% slopes, (Plate 8) (USDA, 1992). Table 3 presents some <br /> ton selected properties of the soil: <br /> Table 3. <br /> —San Joaquin County Soil Survey— <br /> Selected Soil Properties of On-Site Soils. <br /> Soil 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 /> Stockton 0-29: Clay,CL,CH. <2 7.4-8.4 0.06-0.2 Severe:peres <br /> clay,0-2% 29-37: Clay,silty clay,CL,CH. <2 7.4-8.4 0.06-0.2 slowly <br /> slopes,250. 37-42: Clay loam,silty clay loam,CL. <2 7.4-8.4 0.06-0.2 <br /> 42-60: Cemented. --- --- --- <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 6 <br />