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w 1 Ms Vicki McCartney Project No 880-040 IA • January 30, 2404 1 Page 3 GROUNDWATER MONITORING On January 12, 2004, groundwater samples and depth to water data were collected from ' monitoring wells MW-1 through MW-5 Groundwater samples were analyzed for the presence of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ' ethylbenzene, xylenes (BTEX), and for five gasoline oxygenates, MTBE, d>-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), and tert-butyl alcohol (TBA) using U S Environmental Protection Agency (EPA) Methods 8015GRO/8021 and 8260B Field and laboratory procedures are presented in Attachment A Certified analytical reports, chain-of-custody documentation, and field rdata sheets are presented in Attachment B 10 ��f3alQ� F F i r�Quarter Groundwater Monitoring Results Groundwater elevation at the site increased approximately 0 79 feet since the previous sampling event conducted on October 13, 2003 During the first quarter groundwater flow was to the north-northeast at an average gradient of 0 001 ft/ft, which is consistent with previous sampling events Groundwater elevation data are presented in Table 1 A groundwater elevation contour map based on the January 12, 2004, data is shown on Figure 1 TPHg range hydrocarbons were reported in wells MW-1 and MW-3 at concentrations of 3,000 and 200 micrograms per liter (gg/L), respectively Benzene was reported in wells MW-1 and MW-4 at concentrations of 600 and 2 8 µg11, respectively MTBE was reported in all wells sampled at concentrations ranging from 15 gg/L in well MW-3, to 5,100 µg/L in well MW-4 TBA was reported in wells MW-1, MW-4, and MW-5 at concentrations of 4,500, 5,500, and 19,000 and gg/L. Groundwater analytical data are presented in Table 1 A TPHg, benzene, and MTBE concentration map based on January 12, 2004, data is shown on Figure 2 Shaw Environmental,Inc ' N\sac DP120041Prr�188018800401A 4aa doe