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Ms Vicki McCartney Project No 880040 1A 02010000 <br /> March 23, 2005 <br /> Page 3 <br /> and 8260B Field and laboratory procedures are presented in Attachment A Certified <br /> analytical reports, chain-of-custody documentation, and field data sheets are presented in <br /> Attachment B <br /> Fourth Quarter Groundwater Monitoring Results 1k� .np/f a <br /> Groundwater elevations measured at the site were an average of 0Z feet 1p;fiver than <br /> p&XobV tiM <br /> measured in the previous sampling event of )t4 j s ,� 2004 Groundwater flow <br />' inferred to be to the northeast at an average gradient of 0 00,2'-which was consistent with <br /> previous sampling events Groundwater elevation data are presented in Table 1 <br /> A groundwater elevation contour map based on the January 17, 2005 data is shown on <br /> Figure 1 <br /> TPHg range hydrocarbons were reported in samples from wells MW-1 and MW-3 at <br /> concentrations of 3,900 and 160 micrograms per liter (µg/L), respectively Benzene was <br /> reported in samples from wells MW-1 and MW-4 at concentrations of 750 and <br /> 0 58 ttg/L, respectively MTBE was reported in all samples from wells MW-2 through <br /> MW-5 at concentrations ranging from 6 1 pg/L (well MW-3), to 1,800 µg/L (well <br /> MW-4) TBA was reported in samples from all wells except MW-4 at concentrations <br /> ranging from 130 pg/L (well MW-3), to 5,100 µg/L (well MW-1) J Groundwater <br /> analytical data are presented in Table 1 TPHg, benzene, and MTBE concentrations on <br /> January 17, 2005, are shown on Figure 2 <br /> DISCUSSION <br /> � 1 foo t <br /> 1 Groundwater levels were s s lower than in the October 2004 sampling event <br /> Groundwater analytical data were generally consistent with historical data <br /> Shaw recommends continued monitoring of the site groundwater monitoring wells to <br /> further evaluate the dissolved hydrocarbon plume at the site <br /> 1 <br /> SHAW ENVIRONMENTAL,INC <br /> N lsacdP120051Prj%8018800401A 5aa doc <br />