Laserfiche WebLink
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 /> 9.0 ACTIVITIES PLANNED THROUGH 2013 <br /> The following activities are planned for 2012: <br /> • Groundwater monitoring and sampling will continue quarterly. The next sampling event <br /> is anticipated in January 2013. Proposed changes in sampling frequency (Table 9) will be <br /> implemented upon receipt of regulatory concurrence. <br /> • Groundwater data evaluation will continue, including the use of the decision logic <br /> diagram(Figure 5). <br /> • The effect of the full-scale (2008) and supplemental injection (2010 and 2012) programs <br /> will be monitored. If data from upcoming quarterly sampling events indicate Cr <br /> concentrations have decreased to below the established WQO (50 µg/L), <br /> recommendations may be made to shut down groundwater extraction wells. <br /> MWH. <br /> 9-1 <br />