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4 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> Between November 26, 2002 and March 26, 2003, the groundwater surface beneath the site rose <br /> an average of 3 37 feet The groundwater gradient configured using the shallow-constructed wells <br /> decreased from 0 0029 to 0 0014 foot/foot, and the flow direction shifted less than 5 degrees <br /> toward the northeast The groundwater gradient configured using the deep-constructed wells <br /> decreased from 0 0038 to 0 0020 foot/foot, and the flow direction shifted approximately 30 degrees <br /> toward the northeast Since May 1992, the groundwater surface has risen approximately 24 1 feet <br /> Groundwater from Irrigation Well#2 did not contain detectable concentrations of any of the <br /> gasoline compounds analyzed Groundwater collected from Irrigation Well #2 has been free of <br /> gasoline compounds for 12 consecutive quarters <br /> Between November 26, 2002 and March 26, 2003 the concentrations of gasoline compounds in the <br /> groundwater monitoring wells remained relatively consistent MTBE in groundwater appears to be <br /> ' limited to the groundwater table to the northeast (downgradient) of the former UST As shown on <br /> the isoconcentration map (Figure 6), the plume of groundwater impacted by MTBE is defined to the <br /> ' south by VW-1, to the east by MW-4, and to the northeast (downgradient) by MW-8A and MW-8B <br /> Based on these conclusions, Ramage Environmental recommends that the groundwater extraction <br /> 10 scope of work be implemented and that the monitoring well network continue to be monitored and <br /> sampled on a quarterly basis The groundwater extraction will commence upon regulatory approval <br /> ' of the scope of work and cost pre-approval from the UST Cleanup Fund The next quarterly <br /> groundwater monitoring event is scheduled for June 2003 <br /> 10 8 <br /> r <br />