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VZ1 INC, <br /> APPENDIX IV <br /> SOIL AND GROUNDWATER SAMPLING PROTOCOL <br /> 1.0 EXPLORATORY EXCAVATION PROCEDURES <br /> The lateral and vertical extent of soil hydrocarbon contamination at the subject property will be <br /> determined by surface excavation procedure to attempt clean closure. The area to be excavated will be <br /> immediately around the location of the previous underground storage tanks. The excavation plan will <br /> provide for a pit extending vertically downward from the area of maximum surface contamination. <br /> Equipment will be able to excavate material to a max mum depth of approximately 30 feet. <br /> A California State Certified Engineering Geologist w 11 supervise drilling and excavating operations. <br /> He will review and supervise the separating and stocl piling of the clean and contaminated soil, make <br /> onsite changes in excavation geometry and record en ountered geologic and hydrocarbon <br /> contamination conditions as observed in the field. Excavation of contaminated soil will continue until <br /> } soil that is believed to be uncontaminated is reached both vertically and laterally along the sides and <br /> bottom of the pit. Soil samples will be obtained aloe the walls and floor of the excavation laterally <br /> every 50 feet, or as appropriate, and will be analyzed for specific constituents as outlined in the <br /> workplan. The excavation process will continue unti I non-detect soil contamination levels are reached <br /> for all walls and floors of the pit. Appropriate fencing material will be placed around the excavation <br /> to prevent unauthorized entry. After regulatory approval the excavations will be backfilled. <br /> 08420010.001 i <br />