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CAMBRIA <br /> • Groundwater samples collected from wells MW-2, MW-4, MW-7, and MW-9 <br /> contained TPHg concentrations ranging from 873 to 6,600 ppb, and benzene <br /> concentrations ranging from <0 500 to 53 4 ppb Wells MW-4 and MW-8 contained <br /> MTBE concentrations of 7 95 and 42 3 ppb, respectively TPHg, benzene, or <br /> MTBE were not detected in the remaining wells A chemical concentration map is <br /> presented on Figure 2 <br /> Quarterly Sampling <br /> Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPHg) by <br /> EPA Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> methyl tertiary butyl ether (MTBE) by EPA Method 8020 <br /> Chemical analytical data are presented in a summary table in Blaine's groundwater <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 /> E4 <br /> ft�l <br /> Lisa Sum ers <br /> Staff Scientist <br /> 9wv� <br /> Joe W Neely, RG \S,��R�D`GEp�O <br /> Senior Project Geologist �� S��H AFF G� <br /> RG 6927 O �.c <br /> No 6927 <br /> . SOF CA11��- <br /> 241-0778 2 <br />