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February 6,2006 <br /> NOA Project Number: E05173A <br /> conditions,ground water concentration containing nitrate is no more then abo t 13.5 mg/L 03 (3 <br /> mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 /L-N) or more are those in w ch nitrate <br /> conce ns may be easing (Hull, 1984). <br /> DBCP was not detected ' the water sample. DBCP is a nematocide and soil fumigant for vegetables <br /> and grapes. It ' ught to cause health problems consisting of kidney damage,liver damage, and / <br /> L cancer.'The use of DBCP was discontinued in 1979.The Environmental Protection Agency (EPA) <br /> set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) because the EPA believes <br /> that given present technology and resources,this is the lowest level to which water systems can <br /> reasonably be required to remove this contaminant should it occur in drinking water. <br /> 4.4 Well Water Sample Collection,Handling, and Transportation <br /> 6. The water sample for nitrate was collected in a sterile plastic container, and the sample for DBCP <br /> was collected in two sterile glass vials.The samples were then transported on ice and remained under <br /> chain of custody to Precision Enviro-Tech, Stockton. <br /> 4.5 Chain of Custody <br /> L <br /> The Chain of Custody documents have been included in the appendix of this report <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is depicted on the Preliminary Geologic Map of the San Francisco - San Jose Quadrangle, <br /> `. California (1991), as within g uaternaty Fan deposits. The unit is composed of gravel, <br /> sandy silt, and clay mish,r s (Plate 3). <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 the Capay day, 0-2% slopes and Capay day,we 0-2%slopes (Plate 4) (USDA, <br /> 1992). Table 4 presents some selected properties of the soils: <br /> Table 4. <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/ Reaction ability absorption <br /> Symbol cm pH (in/hr) fields <br /> Capay 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,CH <2 6.6-8.4 0.06-0.2 slowly <br /> 118. <br /> 6 <br />