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I <br />CAMBRIA <br />[e] <br />• <br />(Plate 2) Groundwater flow direction is predominately to the southeast with some <br />variance near MW -2 where there appears to be a hydraulic mound The approximate <br />hydraulic gradient was calculated to range from 0 02 to 0 05 <br />• Groundwater samples collected from Wells MW -2 and MW -9 contained TPPH <br />concentrations of 302 and 351 ppb, and benzene concentrations of 3 70 and 9 32 <br />ppb, respectively Wells MW -2, MW -4, and MW -9 contained MTBE concentrations <br />ranging from 6 85 to 8 36 ppb TPPH, benzene, or MTBE were not detected in the <br />remaining wells A chemical concentration map is presented on Plate 2 <br />Quarterly Sampling <br />Monitoring Wells MW -1 through MW -10 were sampled and analyzed for total purgeable <br />petroleum hydrocarbons as gasoline (TPPH) by EPA Method 8015 (Modified) and benzene, <br />toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary butyl ether (MTBE) by EPA <br />Method 8020 <br />Chemical analytical data are presented in a summary table to Blame'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 />O QApF ESS/O <br />Lisa Summe@�' �4j� C' PIA7TCy� .0- <br />C-13Staff Scientist C-13 <br />W No C 7 49 M <br />°c ExpI sT ZO <br />wen C Ra by <br />Project Engineer �� clvl\. \Q <br />C47749 �F OF CALkF��� <br />241-0778 <br />2 <br />