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Ca@OfgIa-PaCIfIC COfpOfatlOfl 133 Peachtree Street N.E. (30303) <br /> P.O. Box 105605 <br /> Atlanta, Georgia 30348-5605 <br /> Telephone(404)5214000 <br /> February 11, 1992 <br /> California Regional Water Quality <br /> Control Board - Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Attention: Mr. William J. Marshall, Chief <br /> Waste Discharge to Land Unit <br /> Dear Mr. Marshall: <br /> RE: Clean-up Goals for Chloroform in Groundwater <br /> Georgia-Pacific Chemical Packaging Plant <br /> Tracy, California <br /> This letter has been prepared in response to the December 6, 1991 letter received from the California <br /> Regional Water Quality Control Board - Central Valley Region (RWQCB) regarding the current <br /> monitoring system and clean up goals at the above referenced site. To date a groundwater monitoring <br /> program is in effect. This monitoring program provides for measurement of monitoring well water levels <br /> and collection of groundwater samples for chemical analysis. <br /> Review of Groundwater Quality <br /> Groundwater quality data has been collected and reported since the beginning of the monitoring program <br /> in 1985. Background water quality conditions were not known at the beginning of the program, although <br /> a pre-existing condition may have been present that would affect the clean up goal of 5ug/1 of chloroform <br /> in the groundwater at the site. This pre-existing condition involves the water tank associated with the <br /> City of Tracy South Area well. Observations of water, with a chlorine odor, flowing from the water <br /> storage tank into the storm water basin, were noted from at least January 1985 (Brown and Caldwell, <br /> 1985). It is not unlikely that levels of chlorine were discharged into the storm water basin from a period <br /> of time before the superchlorination of the storm water basin occurred. Continued discharge of this water <br /> into the storm water basin is occurring (up to 4 feet of water was observed in the storm water basin in <br /> 1989). The Brown and Caldwell reports have identified hydraulic connection between the storm water <br /> basin and the underlying water bearing units being monitored(Brown and Caldwell, 1985). The presence <br /> of this pre-existing and continuing condition influences the background water quality and the clean up <br /> goals established would not be technilogically feasible. <br /> USS A> <br />