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05 May 1999 AGE-NC Project No. 98-0522 • Page 2 of 3 The sampling assembly was loaded with four pre-cleaned 6-inch by 1.12-inch brass sleeves and was driven to the desired sampling depth, where a restraining pin on the sampler point was released and the sampler was driven an additional two feet into the subsurface, filling the brass sleeves with soil. Upon retrieval of the sampler, a soil-filled 6-inch sleeve was preserved for laboratory analysis by covering the ends of the soil-filled sleeve with a Teflon sheet, capping with a plastic endcap, and sealing with duct tape. The preserved samples were labeled with boring designation, depth, date and time, and were then stored in a chilled container pending shipment to the analytical laboratory. The preserved samples were shipped in a chilled container under chain-of-custody to McCampbell Analytical, Inc., (MAI) a California Department of Health Services (DHS)-certified analytical laboratory. Selected samples were analyzed for: • Total petroleum hydrocarbons quantified as diesel (TPH-d) in accordance with EPA Method 8015 Modified and • Volatile aromatics (benzene, toluene, ethylbenzene and xylene: BTEX) in accordance with EPA Method 8020. • A total of eight soil samples were selected for laboratory analysis. TPH-d and BTEX were not detected any of the soil samples analyzed, nor was any hydrocarbon odors noted during the soil sampling. The laboratory report (MAI Lab ID numbers 02477 through 02484), Quality Control and Quality Assurance (QA/QC) report and chain-of-custody are included. UST ABANDONMENT On 25 February 1999 the diesel UST was backfilled with three-sack mix sand concrete. The backfill was performed under inspection of the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD) and Stockton Fire Prevention(SFP). On the same day excess tank bottom waste were removed from the tank, piping and storage barrels. Approximately 100 gallons of rinseate were transported under manifest to Industrial Services Oil Company in Los Angles, California (State Manifest Document No. 98891620) by Norcal Oil of Turlock, California. On 21 December the USTs were triple rinsed by AGE, using a pressure washer and an alconox solution. The liquid contents of the USTs were removed. Approximately 250 gallons of rinseate were transported under manifest to Industrial Services Oil Company in Los Angles, California (State Manifest Document No. 98891636)by Norcal Oil of Turlock, California.