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<w <br /> U1 <br /> 01 <br /> CAMBRIA <br /> j, r <br /> MW-17 contained benzene concentrations ranging from 2 51 to 12,100 ppb MTB*-' '?f <br /> was detected in wells MW-3 and MW-4 at concentrations of 121 and 14 7 ppb, �O <br /> respectively A chemical concentration map is presented on Figure 2 <br /> Quarterly Sampling <br /> Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPHg) by <br /> EPA Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> methyl tertiary butyl ether (MTBE) by EPA Method 8020 <br /> Ur <br /> NLqqplw Field monitoring data and chemical analytical data are presented in a summary table in <br /> Blaine's groundwater monitoring report (Appendix A) <br /> Conclusions <br /> Groundwater samples collected from the monitoring wells this quarter contained petroleum <br /> hydrocarbon concentrations similar to previous quarters' concentrations Groundwater flow <br /> direction and gradient was found to be consistent with the previous monitoring event s <br /> findings <br /> Groundwater monitoring and sampling will continue on a quarterly basis for this site <br /> Closing <br /> Cambria reviewed SJCPHS's April 17, 2000 letter which comments on our August 26, 1999 <br /> work plan We prepared and issued a Response Letter/Amended Work Plan on May 11, 2000 <br /> and are currently waiting for approval from SJCPHS before we proceed with our <br /> investigation <br /> During the second quarter 2000 monitoring and sampling event we will analyze all <br /> groundwater samples for fuel oxygenates and lead scavengers by EPA Method 8260 We <br /> have also instructed the groundwater sampling contractor to attempt to clear well MW-16 of <br /> the obstruction that has been reported in this well for the past several quarters Well MW-16 <br /> will be sampled if the obstruction is cleared <br /> Wells VEW-1 through VEW-4 are also going to be sampled Since the groundwater level has <br /> risen at this site, the screened intervals in these vapor extraction wells are now exposed to <br /> 1399 2 <br />