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CAIV� BRIA <br /> • Ground water samples collected from Wells MW-I through MW-10 contained total <br /> purgeable petroleum hydrocarbons as gasoline (TPPH) concentrations ranging from <br /> ND to 16,000 parts per billion (ppb), benzene concentrations ranging from ND to <br /> 110 ppb, and methyl tert-butyl ether (MTBE) concentrations ranging from ND to 34 <br /> ppb A chemical concentration map is presented on Plate 2 <br /> Quarterly Sampling <br /> Monitoring Wells MW-I through MW-10 were sampled and analyzed for TPPH by EPA <br /> Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes (BTEX), and MTBE <br /> by EPA Method 8020 <br /> Field monitoring data and chemical analytical data are summarized in Table 1 of Blaine's <br /> ground water monitoring report, presented in Appendix A <br /> Conclusions and Recommendations <br /> Wells MW-1, MW-3 through MW-5, MW-7, and MW-8 have shown decreasing quantities of <br /> TPPH for approximately the last four years Quarterly monitoring, sampling, and reporting <br /> will continue on the established 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 /> A'A <br /> Aubrey K of <br /> Staff Geolo st �ROFcSSfDI , <br /> a�1 LUA/a <br /> Diane M Lundquist, P E <br /> Principal Engineer No C46725 <br /> C46725 <br /> A�OF CW�Q <br /> 240-0778 2 <br />