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4.0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS Between March 26, and June 20, 2003, the groundwater surface beneath the site dropped an average of 1 07 feet The groundwater gradient configured using the shallow-constructed wells decreased from 0 0014 to 0 0004 foot/foot, and the flow direction shifted approximately 5 degrees toward the north The groundwater gradient configured using the deep-constructed wells increased slightly from 0 0020 to 0 0022 foottfoot, and the flow direction shifted approximately 20 degrees toward the north Since May 1992, the groundwater surface has nsen approximately 23 1 feet Groundwater from Imgation Well#2 did not contain detectable concentrations of any of the gasoline compounds analyzed Groundwater collected from Irngation Well #2 has been free of gasoline compounds for 13 consecutive quarters Between March 26, and June 20, 2003 the concentrations of gasoline compounds in the groundwater monitoring wells remained relatively consistent MTBE in groundwater appears to be limited to the groundwater table to the northeast (downgradient) of the former UST As shown on the isoconcentration map (Figure 6), the plume of groundwater impacted by MTBE is defined to the south by VW-1, to the east by MW-2 and MW-4, and to the northeast (downgradient) by MW-8A and MW-8B Based on these conclusions, Ramage Environmental recommends that the groundwater extraction scope of work be implemented and that the monitoring well network continue to be monitored and sampled on a quarterly basis The groundwater extraction will commence upon regulatory approval of the scope of work and cost pre-approval from the UST Cleanup Fund The next quarterly groundwater monitoring event is scheduled for September 2003 1