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2012 Annual Groundwater Monitoring and Evaluation Report <br /> Full-Scale In Situ Hexavalent Chromium Reduction Treatment Implementation <br /> Former Marley Cooling Tower Site, Stockton,California February 2013 <br /> The average linear velocity of groundwater in the Intermediate Zone across the source area was <br /> approximately 0.91 ft/day in July 2012 and 0.42 ft/day in October 2012. <br /> (a MWH. <br /> 3-6 <br />