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. 06 September 2002 <br /> AGE Project No 95-0130 <br /> Page 3 of 4 <br /> The maximum distance between the t Y streamlines far upstream from the pumping well is <br /> Ymax — Q —bu <br /> — 962 5 ft3/day— (25 R)(0 1134 f1/day) <br /> 340 ft <br /> Thus, at an infinite distance directly upgradient from the extraction well, the capture zone would <br /> extend 170 feet to each side of the stream line moving directly toward the extraction well For <br /> positive Y values, the intermediate points are given by the equation <br /> x = y—tan €[+1 - (2 bu — Q) y ] T11 <br /> The following table lists some of the data points used to plot the extent of the capture zone <br /> �� x <br /> 5 -19 <br /> • 10 -16 <br /> 15 -12 <br /> 20 -S <br /> 25 -2 <br /> 30 7 <br /> 35 21 <br /> 40 47 <br /> 45 107 <br /> 50 570 <br /> Using the above referenced capture zone values,a theoretical capture zone is illustrated on Figure 3 <br /> As seen on Figure 3, a downgradient capture zone of 54 feet is calculated, therefore, it is unlikely <br /> that ground water extraction activities from the Top Filling Station will draw other off-site sources <br /> of contamination (1 e Roek Property investigation) towards the site <br /> I <br /> Based on quarterly ground water monitoring samples collected at the site,substantial methyl tertiary- <br /> butyl ether concentrations have consistently been encountered in water samples collected from Top <br /> Filling Station wells VW-1, VW-2, VW-3, MW-6, and based on ground water monitoring well <br /> samples collected at 102 South Wilson Way (Roek Property) by Ground Zero Analysis, Inc , an <br /> apparent trend of increasing MTBE concentrations have been observed in off-site monitoring wells <br /> MW-3, MW-4 and MW-14 (First Quarter 2002 Groundwater Sampling Report, dated 1 l April <br /> • 2002), located approximately 100 to 200 feet east-southeast of the Top Filling Station <br /> Advanced GeoEnvironmental,Inc <br />