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F r r CAMBR6A o Cambria evaluated water-level measurement data and prepared a groundwater contour map (Figure 2) Groundwater flow ranges from easterly to northeasterly with an approximate hydraulic gradient of 0 01 o TPHg was not detected in any of the groundwater samples Benzene was detected in well MW-4 at a concentration of 1 21 ppb MTBE (by EPA Method 8020) was reported in wells RW-2, MW-1, MW-2, MW-3, MW-5, VEW-2 and VEW-4 at concentrations ranging from 19 6 to 2,440 ppb The MTBE concentration in well MW-5 was confirmed by EPA Method 8260A at a concentration of 2,390 ppb A chemical concentration map is presented on Figure 2 o HVOCs were detected in VEW-3 (by EPA Method 8010B) Chloroform was reported at a concentration of 0 544 ppb, DCE was reported at a concentration of 4 13, and TCE was reported at a concentration of 6 42 ppb Quarterly Sampling • Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPHg) by EPA Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary butyl ether (MTBE) by EPA Method 8020 Samples from well MW-5 were also analyzed for MTBE by EPA Method 8260A Groundwater samples from well VEW-3 was also analyzed for halogenated volatile organics (HVOCs) by EPA Method 8010B (Table 1) Field monitoring data and chemical analytical data are presented in a summary table in Blaine's groundwater monitoring report (Appendix A) Additional groundwater analytical data is summarized on Table 1 Conclusions and Recommendations Cambria received SJCPHS August 24, 2000 letter approving our proposed field work activities outlined in our August 18, 2000 Well Destruction Work Plan The well destruction work was completed the week of September 18, 2000 Cambria will prepare and submit a well destruction report during the fourth quarter of 2000 40 0821 2