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I <br /> concentrations of 660 and 220 ppb MTB—/was detected in well MW-4 b 1Ly � <br /> Metl+ed—b at a concentration of 51 6 ppb a� u , .C)c) ice► u,-.XX AW)-� <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 Groundwater samples collected <br /> from wells MW-4 and MW-7 were also analyzed for MTBE by EPA Method 8260A <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 wells this quarter contained concentrations of <br /> petroleum hydrocarbons and MTBE consistent with historical ranges for this site <br /> • Closing <br /> Cambria submitted a work plan to SJCP14S on January 31, 1999 for further investigation at <br /> this site S3CPHS approved this work plan and we are pursuing access agreements and <br /> encroachment permits for the proposed off site monitoring wells The two proposed onsite <br /> soil borings are tentatively scheduled to be drilled May 23 and 24, 2000 <br /> Quarterly monitoring and sampling will continue on the established schedule for this site <br /> 0854 2 <br />