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KLEINFFLDER • Benzene, Toluene, Ethylbenzene, Xylenes (BTEX) by Method 8015/8021 B • Total Puigeable Petroleum Hydrocarbons as referenced to Gasoline (TPH-G) by EPA Method 8015/8021B The samples were analyzed on a standard laboratory turnaround schedule requiring ' approximately 10 working days For a summary of the results of the chemical analyses conducted, please refer to the attached ' Table 1 ' 3.0 FINDINGS The groundwater flow direction was calculated to be towards the northeast with a gradient of ' approximately 0 011 ft/ft (see Plate 3) during the August 2001 sampling event The groundwater flow direction was calculated to be cast by southeast with a gradient of approximately 0 0053 ft/ft (see Plate 4) during the December 2001 sampling event Past groundwater flow directions ' between October 1998 and July 2000 have been to the northeast at gradients ranging from 0 004 to 0 010 ft /ft Groundwater flow changed slightly in December 2000 with an estimated flow to the east at a gradient of approximately 0 005 ft/ft ' Although no measurable product or sheen was noted, a petroleum-like odor was noted from purge water m monitoring well MW-1 during both sampling events No unusual odor was noted in monitoring wells MW-2 and MW-3 during these two semi-annual sampling events TPH-G and BTEX constituents were detected in one or more groundwater samples collected ' from the three wells during the two 2001 sampling events The analytical results are summarized on the attached Table 1 ' During the August, 2001 sampling event, TPH-G was detected in groundwater from each of the three wells at concentrations ranging from 49 to 2,400 µg/1 (parts per billion) BTEX constituents ' were detected primarily in MW-1 Benzene was detected at 1,100 µg/1 in MW-1 and at 17 µg/1 in MW-3 Ethylbenzene and total xylenes were detected only in MW-1 at 52 µg/1 and 2 2 µg/l, respectively Toluene was not detected at or above laboratory reporting limits in the three- groundwater samples During the December, 2001 sampling event, TPH-G was detected in groundwater from each of the three wells at concentrations ranging from 36 to 610 µg/1 (parts per billion) Benzene was detected in monitoring wells MW-1 and MW-3 at concentrations of 220 and 190 µg/l, respectively Toluene, ethylbenzene and total xylenes were not detected at or above laboratory ' reporting limits in groundwater samples collected from each of the three wells The two semi-annual sampling events show an overall decrease in petroleum constituent concentrations as compared historically since October 1998, especially in groundwater collected from MW-1 during the last semi-annual sampling event conducted in December 2001 The 20-4439 01 CO3 1 20028010 Pagc 4 of 7 Copyright 2002 Kleinfcldcr Inc January 23 2002