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CAMBRIA <br /> Quarterly Sampling <br /> Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPI-1g) by <br /> EPA Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> methyl tertiary butyl ether (MTBE) by 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 recommended last quarter <br /> that the groundwater monitoring and sampling frequency be reduced to annual at this site We <br /> plan to implement this change during the second quarter of 2000 unless we hear otherwise <br /> from SJCPHS In the future this site will be sampled annually in the first quarter <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 /> Scott Lewis <br /> Staff Geologist 5,�,?,ED GE�� <br /> H W �Focs <br /> Joe W <br /> Leely, RG e <br /> Senior Protect Geologist No 6927 <br /> RG 6927 <br /> .9�Gfi�IFp� <br /> 837 2 <br />