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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 /> reliable as an indicator parameter than is ORP. However, DO data collected during performance <br /> monitoring are of value in the qualitative comparison of DO concentrations since the baseline <br /> sampling event in 2008. Generally the lower DO values are associated with lower ORP and <br /> indicative of reductive conditions (MW-104 and TW-17). No additional action is recommended <br /> at this time regarding the DO readings. <br /> (D MWH.: <br /> 4-12 <br />