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Z1 INC <br /> APPENDIX III <br /> EXPLORATORY EXCAVATION AND SOIL BORING SAMPLING PROTOCOL <br /> 1.0 EXPLORATORY EXCAVATION PROCEDURES <br /> The lateral and vertical extent of soil hydrocarbon contamination at the subject property <br /> will be determined by surface excavation procedure to attempt clean closure The area <br /> to be excavated will be immediately around the location of the existing above ground <br /> storage tank The excavation plan will provide for a pit extending vertically downward from <br /> the area of maximum surface contamination Equipment will be able to excavate material <br /> to a maximum depth of approximately 30 feet, if necessary <br /> A California State Certified Engineering Geologist will supervise excavating operations <br /> • He will review and supervise the separating and stockpiling of the clean and contaminated <br /> soil, make onsite changes in excavation geometry, and record encountered geologic and <br /> hydrocarbon contamination conditions as observed in the field Excavation of <br /> contaminated soil will continue until soil that is believed to be uncontaminated is reached <br /> both vertically and laterally along the sides and bottom of the pit Soil samples will be <br /> obtained along the walls and floor of the excavation laterally every 50 feet or as <br /> appropriate and will be analyzed for specific constituents as outlined In the workplan The <br /> excavation process will continue until non-detect soil contamination levels are reached for <br /> all walls and floors of the pit Appropriate fencing material will be placed around the <br /> excavation to prevent unauthorized entry After regulatory approval the excavation will be <br /> backfilled <br /> • <br /> APPENDIX III <br /> 08220010 011 1 <br />