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California Refonal Water Quality ( Rntrol Board <br /> Central Valley Region �ro> <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 r7- <br /> ?� <br /> _ MC <br /> Phone(916)255-3000 FAX(916)255-3015 \. D <br /> FEB 2 2 2002 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> 20 February 2002 <br /> Ms. Julie Raming <br /> Environmental Affairs <br /> Georgia-Pacific Corporation <br /> P.O. Box 105605 <br /> Atlanta, GA. 30348 <br /> SOURCE AREA ASSESSMENT REPORT AND FEASIBILITYSTUDY, FORMER GEORGIA- <br /> PACIFIC CORPORA TON TRACY CHEMICAL PACKAGING PLANT, 75 WEST VALPICO <br /> ROAD, TRACY, CALIFORNIA,AME PROJECT NO. 16014.01 <br /> We have reviewed the 24 January 2002 Source Area Assessment Report And Feasibility Study, Former <br /> Georgia-Pacific Corporation Tracy Chemical Packaging Plant, 75 West Valpico Road, Tracy, <br /> California (Report). The Report describes the results of a soil and groundwater investigation,performed <br /> on November 18 and 19, 2001, at the stormwater basin located at the Former Georgia-Pacific <br /> Corporator.Tracy Chemical Packaging Plant, 75 West Valpico Road, Tracy, California. The purpose of <br /> the investigation was to assess the distribution of chloroform in the subsurface, and,based on the results <br /> of the investigation, evaluate remedial options to address the contamination. The investigation was <br /> limited to the storm water basin;previously identified as the source area. <br /> Four successively deeper water-bearing sand and gravel units, encountered in the subsurface between 19 <br /> and 86.5 feet below ground surface (bgs), were designated as hydrogeologic Units 1 through 4. <br /> Chloroform was detected below the reporting limit(RL) in the eleven soil gas samples and the eighteen <br /> soil samples retrieved from borings drilled through the storm water basin floor. Chloroform was detected <br /> in three groundwater samples at concentrations ranging from 31micrograms per liter(µg/1) to 47 99/1. <br /> The samples were collected from depths ranging from 31 to 52 bgs. The report describes the extent of <br /> the plume as confined to Unit 2 and measuring 1400 feet by 560 feet. Plume definition is based on <br /> historical chloroform detections in Unit 2 wells BC-15 (0.99 µg/1) ,BC-16, (1.2 µg/1) and BC-20 (1.2 <br /> µg/1). Vertical gradients are described as downwards from Unit 2 to Unit 4. Geochemical parameters <br /> measured in groundwater samples collected from Units 1 and 2 indicate aerobic (oxidizing) conditions <br /> which are unfavorable to reductive dechlorination. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br /> The energy challenge facing Califomia is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at httpl/www.swrcb.ca.gov/mgcb5 <br />