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MWH <br /> BUILDING A BETTER WORLD <br /> February 15 , 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 : 2012 Annual 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 Annual Groundwater Monitoring and Evaluation Report <br /> (GMR) , Full-Scale In Situ Hexavalent Chromium Reduction Treatment Implementation for the <br /> subject site . The report provides the results of the third and fourth quarterly monitoring and <br /> sampling events of 2012 , which were performed in July and October 2012 , as specified in the <br /> Waste Discharge Requirements (WDR) Order No . R5 -2007-0126 . The third quarterly <br /> monitoring event of 2012 was performed from July 18 through 25 , 2012 . The fourth quarterly <br /> event was performed from October 22 through 29 , 2012 . On January 25 and January 30th, 2013 <br /> MWH informed the Central Valley Regional Water Quality Control Board and the Department <br /> of Toxic Substances Control , respectively that due to unforeseen staffing constraints additional <br /> time to complete the report was necessary and that the report would not be submitted on <br /> February 1 , 2013 . To support discussion of observations, first quarter 2013 results for particular <br /> wells are discussed in the text; however, the analytical data reports for all first quarter 2013 data <br /> will be submitted in the 2013 Semiannual Report, which covers the first and second quarter 2013 <br /> reporting period and will be submitted by August 1 , 2013 . <br /> 3321 Power Inn Road TEL 916 924 8844 <br /> Suite 300 FAX 916 924 9102 <br /> Sacramento, California www.mwhalobal.com <br /> 95826 <br />