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CAMBRIA <br /> • Ground water samples collected from Wells MW-2 through MW-4 and MW-7 <br /> through MW-9 contained 1 PPH concentrations ranging from ND to 9,500 ppb, <br /> benzene concentrations ranging from ND to 83 ppb, and MTBE concentrations <br /> ranging from ND to 170 ppb No TPPH, benzene, or MTBE was detected in Wells <br /> MW-1, MW-5, MW-6, and MW-10 A chemical concentration map is presented on <br /> Plate 2 <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 through MW-10 were sampled and analyzed for total purgeable <br /> petroleum hydrocarbons as gasoline (TPPH) by EPA Method 8015 (Modified) and benzene, <br /> toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary butyl ether (MTBE) by EPA <br /> Method 8020 <br /> Chemical analytical data are presented in a summary table in Blame's ground water <br /> monitoring report (Appendix A) <br /> Conclusions and Recommendations <br /> Hydrocarbon and MTBE concentrations are within the historical norm for this site <br /> Quarterly monitoring, sampling, and reporting 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 /> Aubrey K Cool <br /> Staff ologist � <br /> _ r <br /> 4 <br /> Diane M Lundquist, P E <br /> Principal Engineer No 046725 <br /> C46725 <br /> 240-0778 2 <br />