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CAMBRIA <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 and MW-3 were sampled and analyzed for Total Purgeable <br /> Petroleum Hydrocarbons quantitated as gasoline (TPPH), benzene, toluene, ethylbenzene, <br /> xylenes (BTEX), and methyl-tertiary-butyl-ether (MTBE) according to EPA Method 8020 <br /> Field monitoring data and chemical analytical data are presented in a summary table in <br /> Blaine's ground water monitoring report (Appendix A) <br /> Conclusions and Recommendations <br /> Since quarterly sampling began in August of 1989, benzene has been detected in Well MW-1 <br /> five times, in Well MW-2 twice, and in Well MW-3 twice at concentrations ranging between <br /> 0 55 and 3 5 ppb Wells MW-1 through MW-3 have been ND for TPPH since their <br /> installation With the exception of one anomalous high sample result in February of 1997 <br /> and detected concentrations of 2 9 ppb and 36 ppb in third and fourth quarter 1998, <br /> respectively, Well MW-1 has been ND for MTBE since August of 1996 Concentrations of <br /> • MTBE in the remaining wells have ranged between ND and 72 6 ppb <br /> Cambria recommends ground water monitoring and sampling continue on the established <br /> schedule <br /> If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707) 935-4854 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> .Ct � C,-� <br /> Wayne Chtu <br /> Staff gmeeFESSIpyq� <br /> I.uvo Fye <br /> Diane M Lundquist, P E NO C46725 x} <br /> Principal Engineer <br /> C 46 72 5 F <br /> fT�Tf ICA <br /> i <br /> 240-0832 2 <br />