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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 /> correct solution mix. Hydrant water was provided by the California Water Service Company. <br /> The blended solution was delivered to each injection location with a 2-inch diameter hose. <br /> Approximately 96,000 gallons of reductant solution were injected into the Intermediate Zone at <br /> each soil boring, and 9,000 gallons were injected into the Shallow Zone at S-11 and S-15. In <br /> total, approximately 978,000 gallons of reducant solution was injected into the subsurface during <br /> the 2012 supplemental program. SPX will continue quarterly performance monitoring at wells in <br /> the South Yard for at least one year to evaluate remediation progress. <br /> © MWH 5-2 <br />