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Frank C. Alegre Trucking Company, Inc. 4203-F2A Former Trucking Facility January31, 1997 WORK PLAN FOR POND INVESTIGATION(PHASE ONE) Page 2 BACKGROUND The drainage pond was operated until approximately 1980 when it was filled with sand and abandoned (Figure 2). According to Alegre Trucking personnel, the pond collected storm water runoff. In September 1996, San Joaquin County recovered a soil sample from a test pit 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 are below existing regulatory criteria and/or guideline concentrations for these compounds. The reported metal concentrations were below state waste criteria. The soil sample passed the bioassay analysis. 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. Exploratory Test Pits A track-mounted excavator will be used for soil removal. Test pits will be excavated around the margin of the pit in order to determine the lateral extent of the former pit. 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). Exploratory Soil Boring Prior to drilling, a permit will be obtained from the San Joaquin County Health Department. The exploratory boring will be advanced using a Mobile B-61 drilling rig. Initially, a 10- to 12-inch- diameter conductor casing will be advanced to the water table to reduce potential cross-contamination from overlying drainage pond materials. A 8'/<-inch auger will be advanced within the conductor casing down to the existing water table (±35 feet). Soil samples will be recovered at five foot intervals to the base of the boring. One sample within the drainage pond fill material and an additional sample from the base of the pond will be retained for laboratory analysis. A third soil sample will be recovered below the drainage pond, near the base of the vadose zone. Drilling will be performed under the direction of an ENGEO Environmental Geologist and logged in accordance with the Unified Sail