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Frank C.Alegre Trucking Company,Inc. 4203-F2A Former Trucking Facility January 31, 1997 WORK PLAN FOR DRAINAGE Revised February 25, 1997 POND INVESTIGATION(PHASE ONE) Page 2 excavation,within the area of the pond. This sample was submitted to an analytical laboratory and tested for solvents and metals. A bioassay was also performed for the sample. Results of the laboratory analyses found trace concentrations of chlorobenzene, 1,4-dichlorobenzene, toluene and xylenes. The reported concentrations were below existing regulatory criteria and/or guideline levels for these compounds. The reported metal concentrations were below state waste criteria. The soil sample passed the bioassay analysis. Based on the results of the initial sampling and laboratory testing, the San Joaquin County Environmental Health Department requested preparation of an investigation work plan. SCOPE OF SERVICES Health and Safety Plan A site-specific safety plan is provided as an attachment. The safety plan addresses physical and chemical hazards, identifies site personnel, and provides emergency response information. Based on the reported laboratory testing conducted to date on the property, ENGEO does not anticipate that significant chemical hazards will be encountered during the field exploration. The health and safety plan will be maintained on-site during field activities. EMloratory Test Pits A track-mounted excavator will be used for soil removal. Test pits will be excavated around the margin of the pond in order to determine the lateral extent of the former pond. The purpose of the test pits. The materials exposed within the test pits will be logged in the field by an ENGEO Environmental Geologist. Soil from the test pits will be screened in the field for volatile organic vapors using a photoionization detector(PID). The location of the test pits and the lateral limits of the drainage pond will be documented through field surveying and photographs. Exploratory Soil Borings Prior to drilling, a permit will be obtained from the San Joaquin County Health Department. The exploratory borings will be advanced using a Mobile B-61 drilling rig, equipped with an 8'/4-inch hollow-stem auger.' One of the borings will be located in the central section of the pond(Figure 2). The second boring will be located adjacent to the pond and hydraulically down gradient (southwest). Drilling will be performed under the direction of an ENGEO Environmental Geologist and logged in accordance with the Unified Soil Classification System. The soil samples and auger cuttings will be screened in the field using a photoionization detector. Following the completion of drilling activities, the borings will be abandoned by grouting using a tremie pipe and neat cement. ' Drilling services provided by Kvilhaug Well Drilling and Pump Company C-57#482390