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MWH <br /> BUILDING A BETTER WORLD <br /> August 8, 2013 <br /> Mr. Siddharth Sewalia <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Mr. Martin Herrmann <br /> Department of Toxic Substances Control <br /> 8800 Cal Center Drive <br /> Sacramento, CA 95826 <br /> Subject: 2013 Semiannual Groundwater Monitoring and Evaluation Report <br /> Full-Scale In Situ Hexavalent Chromium Reduction Treatment <br /> Implementation <br /> Former Marley Cooling Tower Facility, Stockton, California <br /> Dear Mr. Sewalia and Mr. Herrmann: <br /> This letter serves to transmit the 2013 Semiannual Groundwater Monitoring and Evaluation <br /> Report (GMR), Full-Scale In Situ Hexavalent Chromium Reduction Treatment Implementation <br /> for the subject site. The report provides the results of the first and second quarterly monitoring <br /> and sampling events of 2013, which were performed in January and April 2013, as specified in <br /> the Waste Discharge Requirements (WDR) Order No. R5-2007-0126. The first quarterly <br /> monitoring event of 2013 was performed from January 25 through 29, 2013. The second <br /> quarterly event was performed from April 10 through 16, 2016. On July 31, 2013 MWH <br /> informed the Central Valley Regional Water Quality Control Board and the Department of Toxic <br /> Substances Control that due to a change in project management staff at SPX, additional time was <br /> necessary for SPX to review the report and that the report would be submitted by August 9, <br /> 2013. <br /> 3321 Power Inn Road TEL 916 924 8844 <br /> Suite 300 FAX 916 924 9102 <br /> Sacramento,California www.mwhglobal.com <br /> 95826 <br />