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4a 19 June 2000 AGE-NC Project No 96-0232 Page 11 of 35 concentration of 22,000 µg/1 (Appendix D) Thereafter,AGE requested MSDS sheets from Sinclair Services, as well as other industry bentonite pellet manufacturers from Colloid Environmental Technologies Co (CETCO) and Polymer Drilling Systems (Pel-Plug) The MSDS sheets from all three bentonite pellet manufacturers listed ethyl alcohol and ethyl acetate on the bentonite coating The low concentrations of ethanol detected in the other samples may be valid data, but the high concentrations detected in samples from the multilevel wells appear to be due to introduction of the bentonite pellets (Appendix E) Monthly ground water samples were collected from MW-1 through MW-7 and a second ground water sampling event was performed on wells MW-8 through MW-13 on 26 May 2000 Ground water depths were recorded at approximately I 1 feet bsg (Table 3), general ground water flow direction was towards the west-southwest at a general gradient of 0 002 (Figure 35) Laboratory analysis of groundwater samples detected MTBE in eleven Flag City Chevron samples and In one Three B's Truck Plaza sample at concentrations as high as 5,500 µg/1 (MW-1), maps depicting the approximate extent of dissolved MTBE at depths intervals of 5 to 30 feet bsg and 40 to 60 feet bsg are depicted in Figures 36 and 37, respectively TPH-g was detected in a sample collected from MW-12A at a concentration of 120 µg/1, a map depicting the approximate extent of dissolved TPH-g at depths between 5 to 30 feet is depicted on Figure 38 TPH-d was detected in five samples from Flag City Chevron wells at concentrations as high as 48%Lg/1(MW-I2A) and in five samples from the Three B's Truck Plaza samples at concentrations as high as 2,300 µg/1 (MW-3), maps depicting the approximate extent of dissolved TPH-d at depths between 5 to 30 feet and 40 to 60 feet are depicted to Figures 39 and 40 BTEX compounds were detected in samples from MW-12A(10 to 20 feet) and MW-13A(10 to 20 feet) at concentrations of 25 µg/l and 16 µg/1, respectively TAME was detected in the MW-13A sample at a concentration of 15 µg/l, TBA was detected In sample MW-l0E(130 to 150 feet) at a concentration of 5 2 µg/1 Ethanol was detected in 18 samples at concentrations as high as 110,000 µg/1 Analytical results of ground water samples are summarized In Table 5 A grab ground water sample collected from RDW-1 contained MTBE at a concentration of 16 µg/l, ethanol was detected in the RDW-1 and DW-1 samples at concentrations of 550 µg/1 and 1,600 pg/l,respectively (Table 7) Interim remedial action was continued at the site by pumping ground water from EW-1 at a rate of 2 gallons per minute into a 5,900-gallon above ground storage Baker tank Three grab ground water samples were collected from the Baker tank in May 2000 Dissolved MTBE was detected from the Baker tank at concentrations of 650 µg/1, 800 µg/1 and 490 µg/1 Analytical results of Baker tank grab samples are summarized in Table 9 Advanced GeoEnv4ronmenta[,Inc