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After the samples are labeled, they are immediately stored in refrigerated ' containers at 4 degrees centigrade awaiting shipment to the contract laboratory The samples are sent to the laboratory under chain-of-custody procedures By installing this array of wells, the presence or absence of hydrocarbons can be clearly evaluated. In addition, if hydrocarbons are found in the ' groundwater, the potential need for groundwater remediation can be assessed at an early date. Conversely, by isolating shallow soils from the confined groundwater, samples from the double cased wells " how that the groundwater has not really been impacted by hydrocarbons so that groundwater remediation need not be considered further ' 3 5 Excavation Backfill, Compaction and Pavma After sampling and analysis of soil from the former tank pit and approval ' by San Joaquin County, the excavation will be backfilled with native soil Prior to placing fill, plastic sheeting will be placed in the excavation to separate fill from remaining soil which might (however unlikely) require further remediation Soil will be placed in thin lifts and compacted to 90% of theoretical The backfilling will immediately precede monitoring well installation toTo facilitate use of monitoring wells for extraction if required, shallow trenches will be dug from the monitoring wells to a location adjacent to the existing office Pipes will be installed in the trenches to accommodate groundwater extraction and possibly soil vapor extraction The trenches will then be filled and compacted The entire area will then be paved After installation of an appropriate crushed gravel sub-base, the final covering will be four inches of asphalt ' concrete At the same time, installation of the currently planned truck wash rack canopy can take place 1 ' 3-8 ' COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP INC 111 rV