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2012 Semiannual Groundwater Monitoring and Evaluation Report <br /> Full-Scale In Situ Hexavalent Chromium Reduction Treatment Implementation <br /> Former Marley Cooling Tower Site, Stockton,California October 2012 <br /> • The hydraulic gradient calculated between wells MW-211 and MW-322 <br /> The average linear velocity of groundwater in the Intermediate Zone across the source area was <br /> approximately 1.1 ft/day in January 2012 and 2.1 ft/day in April 2012. <br /> (a MWH,, <br /> 3-6 <br />