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4 <br /> �r. <br /> 2.4 proximity of private, Municipal, and Irrigation Wells: <br /> A survey of all water wells within a one-half mile radius of <br /> dased � information from t <br /> the <br /> aconducte <br /> elosetwellls <br /> DvpartmentofWaterRsou _ <br /> California <br /> A raximately 600 feet north of the site. <br /> an irrigation well app roximately 305 feet <br /> This well completed to a depth of app <br /> below grade. The approximate locations of other known water <br /> wells within one-half mile of the site are located on Figure <br /> 3. <br /> 3.0 k'IELD INVESTIGATION <br /> wo soil <br /> on April 29, 1991, waterwork personne from <br /> adv36.5dto 36 feet <br /> borings (MW1 and SBI) to depths ranging <br /> below grade site to ac-omplish the following: <br /> vertical <br /> 1) petroleum hydrocarbonne the lateral asoi, contanin tion;of <br /> 2) determine soil stratigraphy; and <br /> 3) install a groundwater monitoring well within <br /> the uppermost aquifer in order to assess <br /> groundwater quality. <br /> All site activities involving potential contact with hazardous <br /> materials (diesel contaminated soils) were conducted in <br /> accordance with WaterWork's site specific Health and afeton <br /> y <br /> Plan (Appendix II) . The boring/well locations are pan <br /> Figure 4. Boring/well locations were chosen based on direction. The <br /> r assumed northeast groundwater gradient <br /> northeast gradient was determined after reviewing from water <br /> received by the SJCPHS from three nearby sites, <br /> elevation data provided by the San Joaquin County Regional <br /> Flood Control and Water conservation District. <br /> 3.1 Soil Sampling <br /> Drilling was conducted by ExcelTech Drilling (C57 License No. <br /> 596545} utilizing a hollow stun auger drill rig. A field <br /> geologist continuously logged all drill cuttings and cored <br /> soil samples utilizing the Unzri2d Soil C peslencounteredcation sand <br /> (Appendix III) . Descriptions of soil types Well <br /> sample collection intervals are included on ecollectboring/well <br /> at <br /> logs (Appendix III). Cored soil sameter <br /> five foot intervals using a 2-inch Two split-spoon <br /> 1 samplesper <br /> sampler containing three brass tubes. <br /> 3 <br /> sFs6i?615.+� <br /> .rs��sw <br />