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California Regional Water Quality Co trol Board -: <br /> �■/ <br /> Central Valley Region <br /> Robert Schneider,Chair Gray Davis <br /> Winston H.Hickox - Governor <br /> Secretaryfor Sacramento Main Office <br /> Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 6z z <br /> 6 March 2002 ,�{?\;,;" ')a"'. <br /> Ms. Julie Raining <br /> Environmental Affairs <br /> Georgia-Pacific Corporation - <br /> P.O. Box 105605 <br /> Atlanta, GA. 30348 <br /> SEMIANNUAL GROUNDWATER MONITORING REPORT, FIRST HALF 2002, FORMER <br /> GEORGIA-PACIFIC CORPORA TON TRACY CHEMICAL PACKAGING PLANT, 75 WEST <br /> VALPICO ROAD, TRACY, CALIFORNIA. <br /> We have reviewed the 21 February 2002 Semi-Annual Groundwater Monitoring Report, First Half <br /> 2002, Former Georgia-Pacific Corporation Tracy Chemical Packaging Plant, 75 West Valpico Road, <br /> Tracy, California (Monitoring Report). The Monitoring Report describes the results of groundwater <br /> monitoring activities, performed on 8 January 2002, at the stormwater basin located at the Former <br /> Georgia-Pacific Corporation Tracy Chemical Packaging Plant(Site) and in associated off-site wells. The <br /> purpose of the ongoing monitoring at the site is to assess the distribution of chloroform in groundwater. <br /> Results of groundwater monitoring indicated that groundwater elevations were fairly consistent with <br /> measurements obtained in July 2001. Groundwater flow direction is to the north-northwest. Reported <br /> chloroform concentrations in groundwater however, were lower than historical results. Chloroform <br /> concentrations ranged from less than the laboratory reporting limit in samples collected from monitoring <br /> well MW-BC-6 to 34 micrograms per liter(µg/1) in BC-11A. BC-6 is an upgradient well and BC-11A is <br /> located in the periphery of the source area. Our comments on the report are presented below. <br /> General Comment <br /> 1. According to the Monitoring Report the well casing elevation for BC-11A, installed in June 2001, <br /> was surveyed in the field by reference to nearby monitoring well BC-10. In order to obtain accurate <br /> groundwater elevations, a licensed surveyor must be retained to accurately determine the elevation <br /> of BC-11.Please provide an accurate elevation of BC-11 in the subsequent semi-annual monitoring <br /> report. <br /> 2. Groundwater monitoring at the site is conducted as required by the Central Valley Regional Water <br /> Quality Control Board. Please cite the date of the order under which monitoring at the Site is <br /> conducted. <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br /> The energy challenge facing California 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 http://www.swrcb.ca.gov/Mgcb5 <br />