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Californi" egional Water Quality Con ol Board <br /> Central Valley Region 4 r <br /> Robert Schneider,Chair <br /> Linda S.Adams Arnold <br /> Secreiaryjor Sacramento Main Office <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 956706114 Schwarzenegger <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> http://www.walerbowds.ca.gov/centralval ley <br /> July 17, 2006 <br /> JIJL 1 '92006 <br /> Mr. David Leib Mr. Dan McGrade 1NVihptVS <br /> SPX Cooling Technologies SPX Corporation I'Fm'TjFR�i�ES7k <br /> 200 North Wagner Avenue 13515 Ballantyne Corporate Place <br /> Stockton, CA 95215 Charlotte, NC 28277 <br /> REVIEW OF SEMI-ANNUAL GROUNDWATER MONITORING AMD PERFORMANCE <br /> MONITORING REPORT, AND FIRST QUARTER 2006 GROUNDWATER MONITORING <br /> REPORT, IN-SITU CHROMIUM REDUCTION PILOT STUDY, FOR FORMER MARELY <br /> COOLING TOWER SITE, STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the California Regional Water Quality Control Board, Central Valley Region (Regional <br /> Water Board) has reviewed the Semi-Annual Groundwater Monitoring and Performance <br /> Monitoring Report, and the First Quarter 2006 Groundwater Monitoring Report, In-Situ <br /> Chromium Reduction Pilot Study, for the Former Marley Cooling Tower Site (the Site), <br /> Stockton. The documents are dated April 2006 and May 2006, respectively. The Regional <br /> Water Board received the documents on April 27, 2006 and May 15, 2006, respectively. Your <br /> performance monitoring consultant, Dudek & Associates of Encinitas, prepared the Semi- <br /> Annual Groundwater Monitoring and Performance Monitoring Report. Your environmental <br /> consultant, MWH Americas, Inc., of Sacramento, prepared the First Quarter 2006 <br /> Groundwater Monitoring Report, In-Situ Chromium Reduction Pilot Study plan on your behalf. <br /> As stated in the First Quarter 2006 Groundwater Monitoring Report, In-Situ Chromium <br /> Reduction Pilot Study, the implementation of the Pilot Study is complete. MWH proposes to <br /> discontinue the groundwater monitoring and sampling program associated with the Irl-Situ <br /> Chromium Reduction Pilot Study. There is currently no plan to monitor and sample <br /> groundwater associated with the Pilot Study for the 2nd Quarter 2006. MWH recommends <br /> continued monitoring of the Pilot Study area wells on a quarterly basis as part of the Site-wide <br /> routine groundwater monitoring and sampling program conducted by Dudek & Associates. <br /> Regional Water Board staff concurs with the termination of the groundwater monitoring <br /> associated with the In-Situ Chromium Reduction Pilot Study. Staff also concurs with MWH's <br /> recommendation to continue monitoring of the Pilot Study area wells on a quarterly basis as <br /> part of the Site-wide routine groundwater monitoring and sampling program conducted by <br /> Dudek & Associates. <br /> Regional Water Board staff recommends that a comprehensive monitoring and reporting <br /> program (MRP) be developed and submitted for regulatory review while the draft Remedial <br /> Action Plan (RAP) Amendment is being revised. Since the pilot test is complete, SPX and <br /> California Environmental Protection Agency <br /> Cd Recycled Paper <br />