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California Regional Water Quality Control Board ' <br /> 1":. <br /> Central Valley Region <br /> Robert Schneider,Chair ' <br /> Alan C.Lloyd Ph.D. Arnold Schwarzenegger <br /> Secretary for Sacramento Main Office _ Governor <br /> Environmental Internet Address: http://www.wataboards.ca.gov/cmtralvalley <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 Fax(916)4644797 <br /> 3 May 2005 INN nE(�V[��V/ EDD <br /> Ms. Julie Raming - MAYtt0 9 7005 <br /> Environmental Affairs ENVIRONMENT HEALTH <br /> Georgia-Pacific Corporation PERMIT/SERVICES <br /> P.O. Box 105605 <br /> Atlanta, GA 30348 <br /> REVIEW OF REPORTS, FORMER GEORGIA-PACIFIC CORPORATION CHEMICAL <br /> PACKAGING PLANT, 75 WEST VALPICO ROAD,TRACY, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board(Regional Board)reviewed the <br /> following reports submitted by Acton Mickelson Environmental, Inc. on behalf of <br /> Georgia-Pacific Corporation (GPC) for the former chemical packaging facility at 75 West <br /> Valpico Road in Tracy(site): <br /> • 27 April 2004 Semi-Annual Ground Water Monitoring Report First Half 2004 (Semi- <br /> Annual Report); <br /> • 27 January 2005 2004 Annual Report(Annual Report); and <br /> • 30 March 2005 Air/Ozone Pilot Study Report for In-Situ Treatment of Chloroform in <br /> Ground Water(Pilot Study Report). <br /> The Semi-Annual Report and Annual Report discuss the groundwater monitoring activities <br /> conducted in January and September 2004,respectively, and status of the air/ozone sparge <br /> system pilot study. The Pilot Study Report summarizes the installation of air/ozone sparge points <br /> and monitoring to evaluate the effectiveness of ozone injection as a remedial alternative for <br /> reduction of chloroform concentrations in groundwater. On 30 September 2004, GPC increased <br /> the concentration of ozone from 150-180 parts per million by volume (ppmv) to 500-700 ppmv. <br /> The Pilot Study Report requests additional time to evaluate the effect of the increased ozone <br /> concentration. <br /> Regional Board staff was not notified about the increased ozone injection concentration. <br /> Regional Board staff concurs with the ozone sparging system but is concerned about the increase <br /> in ozone concentration. Recent information regarding subsurface changes induced by ozone <br /> sparging has identified potential problems that must be evaluated and addressed at the site prior <br /> to us concurring with this remedial method as a full-scale remedial alternative. Therefore, the <br /> following information must be provided: <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />