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Surface Water and Well Survey <br /> 4 and CPT Investigation Report <br /> CAM B R IA BP Oil Site No 11193 <br /> • Stockton, California <br /> December 16, 1999 <br /> Groundwater Monitoring Groundwater monitoring for petroleum hydrocarbons has taken place <br /> since 1992, with the addition of MTBE analysis in 1995 The groundwater monitoring wells <br /> screen from 14-19 5 feet bgs to 32-35 feet bgs The vapor extraction well, VW-1, screens from <br /> approximately 7 to 17 feet below ground surface (bgs) and is located north of the tanks Well <br /> MW-1, located south of the tanks, was properly destroyed during replacement activities While <br /> conducting the site monitoring event in October 1999, well MW-2, located north of the tanks, was <br /> found to be damaged, likely a result of tank replacement activities <br /> The maximum concentration of MTBE reported for groundwater samples collected from the <br /> monitoring wells on January 19, 1999 was 3,600 µg/I in well MW-2 (see Appendix A) As shown <br /> on the graph below, the water table elevation has increased while TPHg (or gasoline range <br /> organics [GRO]) concentrations exhibit a decreasing trend and MTBE concentrations exhibit an <br /> increasing trend As described above, MTBE and TAME are the only oxygenates detected in the <br /> analyzed samples <br /> • Well MW-2 <br /> 35,000 0 <br /> 30,000 0 <br /> 0 25,000 'S a <br /> 20,000 -10 2 E d <br /> 15,000 LU 3 <br /> cc <br /> 10,000 -15 2 aZ 00 <br /> 05,000 <br /> -20 <br /> rnrna) rn rn CC) <br /> a a a a aaa <br /> 9- T T T T T T <br /> Date <br /> GRO ----o --MTBE -- --Water Bevation <br /> �--Expon (GRO) - - -Expon (MTBE) <br /> i <br /> 4 <br />