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Former Discovery Chevrolet September 16, 1998 Tracy,California Report on Remedial Work 4 Excavated Soil All hydrocarbon-impacted stockpiled soils were transported offsite between August 20 and 21 by Dillard Trucking (Dillard)of Byron, California. The excavated soil was transported to the Forward Inc. landfill facility in Manteca, California under non-hazardous manifests. The final summary of excavated soil transported to the Forward facility was 676.63 tons. Copies of the Forward Inc. Non-Hazardous Waste Manifests and Weight Tickets are included in Attachment E. Abandonment of Well On August 13, as part of the Corrective Action Plan, the water well discovered outside of the northwest corner of the service bay area at the site was destroyed by V&W Drilling, a licensed well driller from Rio Vista, California. The location of the water well is shown on the Site Plan (Figure 2). The 8-inch diameter steel well casing was measured to a depth of approximately 145 feet bsg. A 2-inch diameter PVC casing was lowered to the bottom of the steel well casing to act as a tremmie pipe, and the well was then destroyed by pressure grouting. Cement grout was placed inside the well casing and the process was repeated until the grout level stabilized in the well at the top of the casing. The top of the steel well casing was then cut off and cement grout was allowed to mushroom out into a shallow excavation at the top of the well. Native soil and baserock was then backfilled into the shallow excavation. A well destruction permit had been previously acquired from the SJCPHS-EHD prior to the abandonment work, and is included in Attachment A. Mr. Ron Rowe, R.E.H.S. at the SJCPHS-EHD witnessed the well destruction procedures at the site. . Disposal of Hydrocarbon-Imp acted Groundwater After excavation of the hydrocarbon-impacted soil in the area of the former UST pit area, groundwater within the excavation stabilized at a depth of approximately 10 feet bsg. Approximately 5,750 gallons of hydrocarbon-impacted groundwater was pumped from the excavation prior to backfilling and stored temporarily onsite in a rented aboveground storage tank (AST). The removal of the groundwater assisted in the compaction of the excavation backfill materials. On August 19, at the direction of Mr. Jeff Wong of the SJCPHS-EHD, a representative composite water sample (W-0819-Tank) was collected from the water being stored in the rented AST. On August 21, at the request of the City of Tracy Utilities Department, a representative water sample (W-0821-HT [Holding Tank]) was collected from the effluent water generated from a field pilot test after treatment of approximately 50 gallons of water by a carbon adsorption canister. The effluent water sample was collected to demonstrate the effectiveness of the 200-pound granular-activated carbon canister for removing dissolved hydrocarbons to no detectable concentrations. The pilot test effluent water was gravity- drained from the AST, and allowed to flow through the granular-activated carbon canister. The treated effluent water was collected in a 55-gallon drum, and temporarily stored at the site,pending analytical results and approval to discharge from the City of Tracy. 3001-21.ovx 4 HORIZON ENVIRONMENTAL INC. C