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Table 2-1. Groundwater Elevations at Wells in the Area of the InvestigWion Site Well LacationM Agency GW Elev(ft) 0IN/06E-02C01M DWR -43.3 01N/06E-10R01M DWR -23.4 01N/06E-i1E02M SJCFCWCD -25.0 01N/06E-12GOIM DWR -45.2 01N/06E-12J01M DWR -36.2 01N/06E-14Q03M DWR -23.9 All elevations are given in feet below Mean Sea Level. SCOPE OF WORK Three monitoring wells will be installed at the site in order to determine if groundwater at the site has been impacted by the petroleum product in the soils. The bore holes will be logged according to the Unified Soil Classification System. The completed wells will be developed, sampled, and surveyed in order to determine groundwater gradients. Soil and groundwater samples will be analyzed for Benzene, Toluene, Xylenes, and Ethylbenzene (BTX&E) - by EPA Methods 8020 and 602, respectively, and Total Petroleum Hydrocarbons as Diesel (TPH-D)by EPA Method 8015, modified. i Three soil borings will be installed at the locations shown in Figure 2- 2. Boring # 1 will be drilled up gradient from the former tank locations in order to provide background groundwater quality data for the site. Borings # 2 and 3 will be drilled down gradient from the former tank locations in order to intercept any groundwater that may have been affected by the contents of the former tanks.1 A 2" monitoring well will later be constructed in each of the completed borings. All borings will be installed using a mobile track mounted drill rig using hollow stem augers. The soils from the borings will be logged according to the Unified Soil Classification System (Appendix B). The drilling logs will be based on information obtained from drill cuttings, actual soil samples, and changes in drilling — 1 The proposed placement of these borings is in accordance with the criteria outlined in the RCRA Ground Mier Moyalorine Technical Enforcement_ Guidance Do ent,U.S EPA,September, 1986. 2-2