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a ' <br /> i CAMBROA <br /> o Cambria evaluated water-level measurement data and prepared a groundwater contour <br /> map (Plate 2) Groundwater flow direction is northeast to southeast with an <br /> approximate hydraulic gradient of 0 008 <br /> o TPHg and benzene were not detected in any of the groundwater samples MTBE was <br /> detected in all wells, except RW-1 and MW-4, at concentrations ranging from 2 77 <br /> to 1,090 ppb A chemical concentration map is presented on Plate 2 <br /> Quarterly Sampling <br /> Monitoring wells were sampled and analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg) 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 (Table 1) <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 /> Ca ®ria Environmental Technology, Inc <br /> �2 <br /> Scott Lewis �E D G c- <br /> Staff Geo gist IIt '11 ANA 0 <br /> FRIEL <br /> :tL r) <br /> a r3el, R , <br /> Senior Pro t Geologist, c xp �y <br /> J l is *6452 <br /> RG 6452 � ``%' <br /> �'E OF C A_\\ <br /> • <br /> 241-0821 2 <br />