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p MWH <br /> BUILDING A BETTER WORLD <br /> October 19 , 2012 <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 : 2012 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 2012 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 2012 , which were performed in January and April 2012 , as specified in <br /> the Waste Discharge Requirements (WDR) Order No . R5 -2007 -0126 . The first quarterly <br /> monitoring event of 2012 was performed from January 24 through 26 , 2012 . The second <br /> quarterly event was performed from April 24 through May 2 , 2012 . On July 26, 2012 , MWH <br /> informed the Central Valley Regional Water Quality Control dBoard and Department of Toxic <br /> Substances Control that additional time to assess chromium concentrations observed at a few <br /> locations in the North Yard was necessary and that the report would not be submitted on August <br /> 15 2012 . To support discussion of observations , third quarter 2012 results for particular wells are <br /> discussed in the text; however, the analytical data reports for all third quarter 2012 data will be <br /> submitted in the 2012 Annual Report, which covers the third and fourth quarter 2012 reporting <br /> period and will be submitted by February 1 , 2013 . <br /> 3321 Power Inn Road TEL 9169248844 <br /> Suite 300 FAX 916 924 9102 <br /> Sacramento, California www.mwhcilobal.com <br /> 95826 <br />