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EA ENGINEERING. ����/nn <br /> SCIENCE, AND v U n <br /> TECHNOLOGY, INC. crP (� <br /> ^ 1Sn <br /> ENVIRO <br /> FEME <br /> WORK PLAN RINIrNISERVIC SETH <br /> Pump Test - Pershing Avenue, Stockton <br /> OBJECTIVES • <br /> Pump tests are designed to gather information about an aquifer <br /> that will allow predictions about the following: <br /> 1) the effect of new withdrawals on existing wells; <br /> 2) drawdown in a well at future times and at different <br /> discharge rates; <br /> 3) the radius of the cone of influence for individual or <br /> multiple wells . <br /> With this data we can determine the performance characteristics <br /> of a well and the hydraulic parameters of an aquifer. <br /> Specifically, recording the drawdown and yield allows the <br /> calculation of the specific capacity. With this data it will <br /> allow us to select pumping equipment, well placement and <br /> remediation designs that are best suited to the physical <br /> parameters of this site. <br /> Test Design <br /> EA proposes to conduct two pumping tests at 4444 N. Pershing, <br /> Stockton. The two proposed pumping wells are MW2 and MW6. MW2 <br /> was selected because it is downgradient from the former pump <br /> island and close to the former tank field. It is hoped that this <br /> well' s position will facilitate the capture and removal of <br /> product that may have migrated downgradient from the former pump <br /> island and that the well site will also have a zone of influence <br /> large enough to mitigate the contamination in and around the <br /> former tank field. MW6 was chosen to mitigate the area <br /> downgradient from the tank field and those waters which might be <br /> out of MW21s zone of influence, especially those waters that have <br /> migrated in the direction of MW10 in Rosemarie Lane. Observa- <br /> tions wells for MW2 will be MW4, MW7 and MW3. For the pump <br /> test in MW6, monitoring wells 10, 3 and 5 will be used as <br /> observation wells . These wells are considered to be in the most <br /> favorable positions to give useful information during the pump <br /> test . The spatial proximity of the observation wells to the <br /> pumping wells should allow for a reasonable response time to <br /> pumping and thus allow for the collection of useful and reliable <br /> data. (Figure 1) The exact nature of each of these wells is <br /> described in the attached logs. <br /> 1 <br />