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MWH <br /> UUMVANG R BETTER WORLP <br /> January 31, 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: 2011 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 2011 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 2011, which were performed in July and October 2011, as specified in the <br /> Waste Discharge Requirements (WDR) Order No. R5-2007-0126. The 2011 Annual GMR <br /> incorporates some of the comments provided by DTSC (dated November 4, 2011) on the 2011 <br /> Semiannual GMR submitted by MWH in August 2011. These comments are scheduled to be <br /> discussed by representatives from DTSC, CRWQCB, SPX Corporation, MWH, and Dudek and <br /> Associates, Inc. during an in-person meeting on February 1, 2011. A formal response to the <br /> comments will be submitted to DTSC following the meeting. <br /> The third quarterly monitoring event of 2011 was performed from July 19 through 21, 2011. The <br /> fourth quarterly event was performed from October 12 through 17, 2011. Additional sampling at <br /> select wells was performed at SPX Corporation's discretion on August 22, 2011, and results are <br /> presented in this report. <br /> 3321 Power Inn Road TEL 916 9248844 <br /> Suite 300 FAX 916 924 9102 <br /> Sacramento,California www.mwhglobal.com <br /> 95826 <br />