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Mr Sam Savig - Project 880-040 IA June 12, 2002 Page 3 coordinated with the Blaine Tech Environmental who monitors the 76 Station east of the subject site Groundwater samples were analyzed for the presence of total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, xylenes (BTEX), and for five gasoline oxygenates (MtBE, di-isopropy 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 8015 Modified, 602 and 8260B, respectively Field and laboratory procedures are presented as Attachment A Certified analytical reports, chain-of-custody documentation, and field data sheets are presented as Attachment B Second Quarter Groundwater Monitoring Results Groundwater levels at the site have increased 0 09 feet since the previous sampling event on January 28, 2002 During the second quarter groundwater flow was generally to the northeast at an average gradient of 0 002 ft/ft, which is consistent with the previous sampling events Groundwater elevation data are presented in Table 1 A groundwater elevation contour map based on the April 23, 2002 data is shown on Figure 1 1 TPH-g was detected in wells MW-1 and MW-3 at concentrations of 4,900 micrograms per liter (µg/1), and 220 µg/l, respectively Benzene was detected in wells MW-1 and 1 MW-3 at concentrations of 1,000 µg/1 and 0 91 µg/1, respectively MtBE was detected in wells MW-1, MW-2 and MW-3 at concentrations of 17,000 µg/1, 3,700 µg/1, and ' 540 µg11, respectively TAME was reported in well MW-2 at a concentration of 30 µg/1 TBA was reported in wells MW-2 and MW-3 at anomalously high concentrations of 65,000 µg/1 and 1,800 µg11, respectively Detection limits were elevated for samples collected from MW-1 Groundwater analytical data are presented in Table 1 A TPH-g, benzene, and MtBE concentration map based on the April 23, 2002 data is shown on Figure 2 Shaw Environmental&Infrastructure,Inc SAC 1N lrancfpllProjedslProjeds1880104011a\0107120021880040_2802 doc-02\a 1 (01070000)