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Pacific Gas and Electric Company Stockton Division Ron Girard <br /> 4040 West Lane Manager <br /> P0.Box 930 <br /> Stockton,CA 95201 <br /> 20919421440 <br /> January 20, 1989 <br /> i r�t <br /> Mr. Robert A. Evans <br /> Area Engineer <br /> California Regional Water <br /> Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> Dear Mr. Evans: <br /> Subject: PG&E's Tracy Service Center Underground <br /> Tank Investigation, Tracy, California <br /> This letter is to present the results of the underground tank <br /> investigation at PG&E's Tracy Service Center located at 502 East Grant <br /> Line Road, Tracy. <br /> From November 17 to 22, 1988, ground water samples were collected by <br /> PG&E from six monitoring wells located at PG&E's Tracy Service Center. <br /> The six monitoring wells (OW-1 through OW-6) surround the location of <br /> the former underground gasoline storage tank, which was removed in <br /> October 1986. Figure 1 shows the locations of the former tank and the <br /> six monitoring wells. <br /> The ground water samples were analyzed by Eureka Laboratories for <br /> total petroleum hydrocarbons (EPA Method 8015), benzene, toluene, <br /> ethylbenzene and xylenes (EPA Method 602), and total lead (EPA Method <br /> 6010) within allowable holding times. Samples were also analyzed for <br /> polynuclear aromatic hydrocarbons (EPA Method 610), because the <br /> service center is also the site of a former manufactured gas plant. <br /> Table 1 presents a summary of these analytical results and the <br /> detection limits for each analysis. Results were nondetectable for <br /> all analyses performed for all wells except OW-2. Ground water samples <br /> collected from well OW-2 were found to contain gasoline hydrocarbons <br /> (0.9 ppm) , benzene (294 ppb), toluene ( 104 ppb) , ethylbenzene (34 <br /> ppb) , and xylenes (172 ppb): <br /> Ground water flow direction analyses were performed on water level <br /> data collected in November and December 1988 to verify previous <br /> calculations. Well OW-2 continues to be directly downgradient of the <br /> former tank location, and wells OW-5 and OW-6 are downgradient of well <br /> OW-2. <br />