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• aquifer may be difficult to predict using groundwater gradient maps that are based on wells <br /> screened in the Riverbank aquifer Chemical data suggest that water in the two aquifers is different, <br /> which could imply that the Modesto aquitard inhibits mixing of water between the two aquifers <br /> As we have recommended in past quarterly status reports, an aquifer pumprng test of GT-10 should <br /> be conducted to provide data on the groundwater flow rate and to test the feasibility of groundwater <br /> extraction as a potential remediation method We have recently performed computer simulations of <br /> a pumping test under various scenarios, and are preparing a revised pump test work plan based on <br /> these sunulations It will be necessary to perform the test before June, due to declining water levels <br /> in the Modesto aquifer during the summer months <br /> 4 <br />