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TF <br /> Pacific Gas and Electrictompany Technical and Ecological Services �N , <br /> 3400 Crow-Canyon Road ' ` '`�`'`°` l 40 <br /> San.'Ramon,CA 94583 <br /> 5101820-2000 <br /> y` <br /> January 4, 1996 <br /> San Joaquin County Public Health Services 4 <br /> Environmental Health Division <br /> P.O.-Box 3 88 <br /> Stockton, CA' 95201-0388 <br /> RE: Fourth Quarter 1995 Groundwater Monitoring Report-and Closure Request <br /> PG&E's Tracy:Service Center, 502 East Grant Line Road, Tracy, California <br /> Mr. Steve Sasso n: d <br /> Enclosed is the fourth quarter 1995 groundwater monitoring report for PG&E's Tracy <br /> Service Center. During the most recent monitoring event, no gasoline hydrocarbons <br /> (including BTEX)'were detected in monitoring.well:OW-2 located within 10 feet and in the <br /> downgradie'nt direction of the former tank location. Thegroundwater flow direction <br /> remained consistent with previous-monitoring events. <br /> During the four consecutive quarters of groundwater monitoring,only benzene(at a <br /> concentration below the drinking water standard of 1.ppb)was detected,on one occasion, in <br /> monitoring well OW-2. No other analytes were detected during the past year. Per your ' <br /> recommendation,PG&E discontinued monitoring the water quality at all well locations <br /> except OW-2 in August 1995, because.the other monitoring wells consistently provided.- <br /> groundwater samples free of all gasoline hydrocarbons. 1 <br /> In light of-the last year of groundwater monitoring data,PG&E requests closure of this. <br /> tank project. Please contact me at(510) 86.6-5888 at your earliest convenience to discuss <br /> this site. <br /> Sincerely, ., <br /> C <br /> Eric Johnso <br /> Environmental Engineer,REA <br /> Enclosure <br />