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r Ms Vicki McCartney Project No 880-040 1A/01070000 October 15, 2003 Page 3 Attachment A Certified analytical reports, chain-of-custody documentation, and field data sheets are presented in Attachment B Third Quarter Groundwater Monitoring Results Groundwater elevation at the site decreased approximately 0 63 feet since the previous sampling event conducted on April 3, 2003 During the third quarter groundwater flow was to the 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 July 21, 2003, data is shown on Figure 1 TPHg range hydrocarbons were reported in well MW-1 at concentrations of 4,400 micrograms per liter (gg/L), and in well MW-3 at concentrations of 160 µg/L Benzene was reported in well MW-1 at a concentration of 640 gg/L MtBE was reported in all wells sampled at concentrations ranging from 230 µg/L in well MW-1, to 14,000 µg/L in well MW-4 TAME was reported in wells MW-1, MW-2, and MW-4 at concentrations of 11, 37, and 250 µg/L TBA was reported in wells MW-1 and MW-5 at concentrations of 8,800 and 41,000 µg/L, respectively Groundwater analytical data are presented in Table 1 A TPHg, benzene, and MtBE concentration map based on the July 21, 2003, data is shown on Figure 2 The analytical data was submitted to the State Water Resource Control Boards (SWRCBs) Geotracker database on July 8, 2003 The Geotracker upload confirmation number is 4439263045 CONCLUSIONS Groundwater levels have decreased approximately 0 63 feet since the second quarter 2003 sampling event Generally, groundwater analytical data for the third quarter 2003 sampling ' event are consistent with historical data r r Shaw Environmental,Inc N\SacDP120031Prj\88018800401A 3ad doe