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Working To Restore Nature 1710 Main Street OREscalon, CA 95320 Phone (209) 838-3507 �N1j1R0�11v� �!TA-SES FAX (209) 838-3509 PER E€�V March 29, 1993 I Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 RE Underground Storage Tank Excavation and Soil Sampling Report for PG & E Stockton Service Center, 4040 West Lane, Stockton, California Dear Mr Knoll The attacher] report describes the soil sampling and laboratory results for samples collected during excavation of the former transformer oil storage tank and associated former,product line locations at the above referenced site Excavation, which was conducted in several phases, occurred on January 12, January 27 and March 10 and samples were collected on January 12, January 27, February 10, and March 10, 1993 (tank removal was conducted on January lb, - i 1987) The 10,000 gallon capacity tank contained transformer oil prior to removal Phase I Sampling - January 12, 1993 1 The confirmation soil samples collected subsequent to initial excavation activities were analyzed for benzene, ,toluene, ethylbenzene, and xylenes (BTEX), total petroleum hydrocarbons as gasoline (TPHG), total petroleum hydrocarbons as Diesel (TPHD) with a fuel fingerprint total oil and grease (TOG), and polychlorinated biphenyls (PCBs) by EPA methods 8020, modified 8015, 5520 E & F and 8080 A total of four former tank area sidewall samples and two product line samples were collected when excavation was deemed complete Analytical data indicated incomplete removal of the petroleum hydrocarbon contamination in the product line and sump areas and on the northern side of the former tank excavation, therefore additional excavation was scheduled for January 27, 1993 REPORMSSR 0393 FNL I I