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r�o8 <br /> Zvi <br /> f <br /> source, should be adequate to provide a preliminary <br /> determination of the groundwater and shallow soil <br /> i.. <br /> t contamination. <br /> The following scope of work is proposed: <br /> is <br /> 1. Four soil borings will be drilled to a depth of 15 feet <br /> below the water table to provide for the installation of <br /> groundwater monitoring wells. Drilling will be <br /> conducted by Osterberg and Stewart under C57 license <br /> ' No. 446670, using a hollow stem auger drill rig. The <br /> Proposed well locations, presented on Figures 2 and 3, <br /> F°A include one well adjacent to the leak point, one well <br /> t upgradient of the tank pit/product lines, and two wells <br /> down groundwater gradient from the underground tank and <br /> >., product line locations. The wells will be permitted and <br /> constructed in accordance with San Joaquin Local health <br /> District requirements. The wells will be constructed of <br /> two inch diameter P480 PVC well screen/casing and <br /> � completed as shown on Figure 5. <br /> fs <br /> 2. Drill cuttings will be logged continuously for <br /> characterization of contamination and soil type by <br /> y Unified Soil Classification System. Descriptions of <br /> soils encountered and monitoring well construction <br /> details will be recorded on a boring/well log and <br /> included within the assessment report. Cored soil <br /> samples will be collected just above the saturated zone <br /> for laboratory analysis and below the water table at <br /> select intervals for soil characterization. Sampling <br /> will be conducted in accordance with WaterWork's Soil <br /> Sampling Protocol (Appendix I). Laboratory analysis of <br /> soil samples will be conducted for benzene, toluene, <br /> ethyl benzene, xylenes (HTEX), and total petroleum <br /> hydrocarbons (TPH) by EPA method 8015/8020, Sequoia <br /> Analytical, a state certified laboratory, will be used <br /> to perform the analyses, as required by law. All <br /> excavated soils will be placed an plastic sheeting, <br /> covered with same and remain on-site until laboratory <br /> results are received. If necessary on-site treatment by <br /> aeration under permit from Air Quality Management <br /> District will be conducted. Subsequent to treatment <br /> soils will be used on-site as fill material. <br /> 3. The wellheads will be surveyed to a common datum and <br /> groundwater levels will be monitored to determine the <br /> site specific groundwater gradient. Free product <br /> thickness, if any, will be monitored using an interface <br /> probe. the monitoring will be conducted in accordance <br /> with WaterWork 's Groundwater Monitoring Protocol <br /> �. (Appendix I). <br /> 4. Subsequent to installation, water samples will be <br /> collected from the monitoring wells after purging a <br /> ` minimum of four well volumes (casing and sandpack). The <br /> wb 3 <br />