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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 /> 5.0 GROUNDWATER TREATMENT ACTIVITIES <br /> A supplemental injection program was implemented from September 9 through October 29, <br /> 2010, to target remaining Cr concentrations in the primary source area (former retort pit) and <br /> Intermediate Zone in the North and South Yards. This supplemental injection program is <br /> described in the 2010 Annual Groundwater Monitoring and Evaluation Report (MWH, 2011a). <br /> No additional remedial activities associated with the full-scale in situ groundwater remediation <br /> program were conducted during the first and second quarters of 2012. <br /> (D MWH <br /> 5-1 <br />