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C A M B R I A <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 through 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 groundwater monitoring report (Appendix A) <br /> Conclusions and Recommendations <br /> Since quarterly sampling Megan 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 three times at concentrations ranging <br /> between 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 29 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 79 3 ppb <br /> i <br /> Cambria recommends groundwater 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 /> I <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> / 1 aka <br /> �CIL <br /> Lisa Summers <br /> Staff Scientist S�r`P S le X1/0 <br /> Nl SR <br /> NO 6717 <br /> Ailsa S Le May <br /> Senior Geologist `��y <br /> RG #6717 rF of C jA0.\ Q <br /> i <br /> 241-0832 2 <br />