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C <br /> .r . <br /> CAMBRIA <br /> Quarterly Sampling <br /> Groundwater samples were analyzed for total purgeable petroleum hydrocarbons as gasoline <br /> (TPPH) by EPA Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), and methyl tertiary butyl ether (MTBE) by EPA Method 8020 <br /> Field monitoring data and chemical analytical data for TPPH, BTEX, and MTBE are <br /> presented in a summary table in Blaine's groundwater monitoring report (Appendix A) The <br /> seven fuel oxygenates were analyzed on the well samples in November 1997 The MTBE <br /> data is included in the table in Appendix A The results for the other oxygenates are <br /> presented in Table 1 <br /> Conclusions and Recommendations <br /> Since quarterly sampling began in August of 1989, benzene has been detected in well MW-1 <br /> five times, in well MW-2 twice, and in well MW-3 four times at concentrations ranging <br /> between 0 55 and 3 5 ppb Wells MW-1 through MW-3 have been ND for TPPH since their <br /> • installation With the exception of one anomalous high sample result in February 1997 and <br /> detected concentrations of 2 9 ppb and 36 ppb in the third and fourth quarters of 1998, <br /> respectively, well MW-1 has been ND for MTBE since August 1996 Concentrations of <br /> MTBE in wells MW-2 and MW-3 have ranged from ND to 79 3 ppb <br /> Cambria recommends that groundwater monitoring and sampling continue on the established <br /> 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 Geologist <br /> d CEO <br /> ANA <br /> FRIEL <br /> A Friel, R <br /> Senior Proj ct Geologist # Exp <br /> . RG 6452 �� Lac •64x2 <br /> F OF CAO- <br /> 241-0832 2 <br />