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U4/07/94 09 53 rAA 91e 371 6761 GROL WU AILR Ir-Ch � G11 CONCORD 4009/011 <br /> CAPTURE ZONE PARAMETERS: <br /> rdg = radius dawng radient <br />' rcg = radius cross-gradient = rdgr <br /> 1For this site, 5 gpm (7200 gpd) was used as a pumping rate <br /> (Q) and the hydraulic gradient (dh/dl) was estimated to be 0. 002 <br /> from the most recent groundwater level measurements . <br /> Transmissivity was taken to be 5, 610 gpd/ft as an average value <br /> for aquifer hydraulic conductivity. The capture zone was <br />' calculated as follows: <br /> rdg = (7200 cxgd) = 102 ft. <br /> 21r (5610 gpd/ft) (0.002) <br /> rcg - (50 ft) r = 160 ft <br /> The following Table summarizes capture zone calculations: <br /> CAPTURE ZONE RADII <br /> Q qpm rdgrcg <br /> 5 102 321 <br />' 7 . 5 153 481 <br /> 10 204 642 <br /> 1 <br />