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04/07/94 10 11 F-U 910 3741- 6761 GRObl%l)IIATER 1hCH — V11 CUNCURD gOO5 <br />' <br /> 7-Eleven/Stockton I9 <br /> April, 1988 <br />' Based on the results of the storativity values calculated, <br /> the average of values from analysis of mw-1 pump test data and <br />' MW-4 , recovery test data is interpreted to be the most represen- <br /> tative value of the shallow aquifer's transmissivity. This value <br /> is 750 ft2/day which is equivalent to 5, 610 gpd/ft. <br />' in order to estimate the area hydraulically controlled by <br /> the recovery well, capture-zone radii were calculated using the <br /> average T value of 5, 150 gpd/ft derived from the aquifer tests. <br /> The calculations (based on the work of Keely and Tsang, 1987) are <br /> presented in Appendix VY, and the results are presented in Table <br /> 4. <br /> TABLE 4 <br /> CAP'T'URE ZONE RADII <br /> 1 Q rd rc <br /> (ft? (fty <br />' 9Pm gpd <br /> 5 7 , 200 102 321 <br />' 7 .5 10, 800 153 481 <br /> 10 14 , 400 204 624 <br /> rdg = radius downgradient <br /> rcg = radius cross-gradient <br />' This data indicates that a pumping rate of between 5 and 10 <br /> gpm would adequately capture the dissolved-hydrocarbon plume as <br /> it currently exists in the groundwater beneath the site (see <br /> Figure 12 -- Capture Zone Map) . <br /> ® <br /> GROUNDWATER <br />' TECHNOLOGY.INC <br />