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I Ms Vicki McCartney Project No 880-040 1A/01070000 April 24, 2003 Page 3 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 data sheets are presented in Attachment B Second Quarter Groundwater Monitoring Results Groundwater elevation at the site increased approximately 0 26 feet since the previous sampling event conducted on January 2, 2003 During the second quarter, groundwater flow was to the northeast at an average gradient of 0 002 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 April 3, 200 data is shown on Figure 1 wL 3 5/f/6 TPHg range hydrocarbons were reported in well MW-1 at concentrations of 5,800 micrograms per liter ([g/L), and in well MW-3 at concentrations of 170 µg/L Benzene was reported in wells MW-1 and MW-2 at concentrations of 760 and i 3 4 µg/L, respectively MtBE was reported in all wells sampled at concentrations ranging from 280 µg/L in well MW-3, to 29,000 µg/L in well MW-5 TAME was reported in wells MW-2, MW-4, and MW-5 at concentrations of 25, 200, and 370 µg/L TBA was reported in wells MW-1 and MW-5 at concentrations of 9,200 and 540 Mg/L, respectively Groundwater analytical data are presented in Table 1 A TPHg, benzene, and MtBE concentration map based on the April 3, 2003 data is shown on Figure 2 The analytical data was submitted to the State Water Resource Control Boards (SWRCBs) Geotracker database on April 16, 2003 The Geotracker upload confirmation number is 5771349430 CONCLUSIONS Groundwater levels have increased approximately 0 26 feet since the first quarter 2003 . sampling event Generally, groundwater analytical data for the second quarter 2003 Shaw Environmental,Inc N 1sacM20031Prj188018800401A 3ab doe