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r r <br /> r <br /> CAM BRIA <br /> • <br /> o Cambria evaluated water-level measurement data and prepared a groundwater contour <br /> map (Plate 2) Groundwater flow direction is generally to the east with some <br /> variance to the southeast with an approximate hydraulic gradient of 0 01 <br /> o TPPH was not detected in any of the groundwater samples Groundwater analytical <br /> results for Wells MW-1 through MW-5, RW-1, RW-2, and VEW-1 through VEW-4 <br /> indicated benzene concentrations ranging from 0 585 to 2 22 ppb and MTBE <br /> concentrations ranging from 17 1 to 944 ppb A chemical concentration map is <br /> presented on Plate 2 <br /> Quarterly Sampling <br /> Wells MW-1 through MW-5, RW-1, RW-2, and VEW-1 through VEW-4 were sampled and <br /> analyzed for Total Purgeable Petroleum Hydrocarbons quantitated as gasoline (TPPH) <br /> according to EPA Method 8015 (Modified), benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), and methyl-tertiary-butyl-ether (MTBE) according to EPA Method 8020 Well <br /> VEW-3 was also sampled and analyzed for halogenated volatile organics by EPA Method <br /> ® 8010B <br /> Field monitoring data and chemical analytical data are presented in a summary table in <br /> Blaine's groundwater monitoring report (Appendix A) <br /> Quarterly sampling and monitoring 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 /> of SS/ <br /> Lisa Summers Q� <br /> Staff S ientist c�0o�f�,C. RgjL, <br /> CIO � <br /> Pio C47749 <br /> ilsajLayw Seniost �} <br /> RG #6717 <br /> f OF C A1.�F� <br /> 241-0821 2 <br />