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C A M B R I A <br /> Quarterly Sampling <br /> Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPHg) <br /> according to EPA Method 8015 (Modified), benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), and methyl tertiary butyl ether (MTBE) according to EPA Method 8020 <br /> Field monitoring data and chemical analytical data for TPHg, BTEX and MTBE are <br /> presented in a summary table in Blaine's groundwater monitoring report (Appendix A) <br /> Analytical data for other constituents are summarized on Table 1 <br /> Conclusions and Recommendations <br /> Petroleum hydrocarbon and MTBE concentrations in groundwater at this site have <br /> historically been low or below laboratory detection limits Cambria recommends that the <br /> groundwater monitoring and sampling frequency be reduced to annual at this site and that this <br /> case be reviewed for closure Cambria will contact SJCPHS to discuss the possibility of closure <br /> for this site <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 /> 14i <br /> Scott >°ewis <br /> Staff Geologist <br /> �`cO\pS�QH W tiFOG'r, <br /> 9A- <br /> Joe Neely, RG <br /> Senior Project Geologist No 6927 ° <br /> RG 6927 <br /> F- <br /> 9�OF <br /> • <br /> 837 2 <br />