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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) and <br /> methanol according to EPA Method 8015 (Modified), and 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 for TPHg, BTEX, and MTBE are <br /> presented in a summary table in Blaine's groundwater monitoring report (Appendix A) <br /> Chemical analytical data for other constituents are presented on Table 1 <br /> Conclusions and Recommendations <br /> MTBE concentrations have increased in wells MW-IA and MW-2A Cambria recommends <br /> confirming these MTBE detections by performing an EPA Method 8260 analysis on <br /> groundwater samples from these two wells during the first and second quarters of 2000 <br /> Methanol has not been detected in well MW-3A and has only been detected once (February <br /> 1998) in well MW-2A Methanol has periodically been detected in well MW-lA, typically in <br /> the fourth quarter Cambria recommends discontinuing methanol analysis in wells MW-2A <br /> and MW-3A, and reducing the frequency of methanol analysis in MW-IA to annually in the <br /> fourth quarter Cambria will implement these changes during the first quarter 2000 <br /> monitoring and sampling event unless we hear otherwise from SJCPHS <br /> If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707) 935-4854 <br /> Sincerely, <br /> Cam,bria En. v-ironmental Technology, Inc <br /> Lisa Summers <br /> Staff Scientist <br /> ?tED GES` <br /> Joe W Neely, RG ��\G`'�eH W �� ip <br /> Senior Project Geologist <br /> RG 6927 ° No 6927 <br /> O�CALICA� <br /> 813 2 <br />