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i r <br /> C A M B R I A <br /> MW-2 The hydraulic gradient was calculated to range from approximately 0 01 to <br /> 0 04 <br /> • Groundwater samples collected from wells MW-2 through MW-4 and MW-7 through <br /> MW-9 contained TPHg concentrations ranging from 168 to 2,800 ppb Wells <br /> MW-2, MW-4, and MW-7 through MW-9 contained benzene concentrations ranging <br /> from 0 695 to 30 5 ppb and MTBE concentrations ranging from 3 44 to 243 ppb <br /> TPHg, benzene, and MTBE were not detected to the remaining wells A chemical <br /> concentration map is 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 /> Lisa Summer <br /> Staff Scientist <br /> GFQ <br /> J"Neely, � �G <br /> Senior Project Geologist <br /> RG 6927 6427 <br /> OF <br /> CAL1f�R�`P <br /> 241-0778 2 <br />