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• <br /> ranging from 4 85 to 434 ppb A chemical concentration map is presented on <br /> 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 /> 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 submitted a work plan for further investigation to SJCPHS on August 26, 1999 We <br /> are prepared to implement the work plan once we have received written approval from <br /> SJCPHS <br /> 1399 2 <br />