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0 <br />I� <br />If soil contamination is observed, the pit will be enlarged outward and downward. Visual <br />observation of contamination will be used to determine the extent of excavation. The excavation <br />will be limited if the following conditions exist: <br />The excavation produces a structural risk to adjacent buildings or other structures <br />Soil staining and PID measurements indicate that the contamination is from a source <br />other than the tank <br />• Ground water is encountered and dewatering is not feasible <br />At the conclusion of excavation, soil samples will be taken from the excavation sidewalls <br />and bottom, and the excavation will be backfilled with clean material and brought up to grade. <br />Chemical hazards due to this activity include skin contact with and inhalation of <br />contaminated material. Physical hazards include typical construction hazards due to work with <br />heavy equipment, trips, falls and slips, and heat stress. <br />Appropriate PPE, air sampling procedures, and standard safety procedures will minimize <br />the hazard during the activity. <br />Open Pit Soil Sampling <br />Field screening will include visual observation of soil discoloration and an oily sheen on <br />the ground; presence of significant PID readings; and the presence of odor. <br />Soil samples will be obtained from the backhoe bucket when it is brought to the surface. <br />Personnel will not enter the excavation pit under any circumstances. <br />To prevent skin contact with contaminated soil and minimize inhalation or ingestion of <br />contaminated material, personnel will wear appropriate PPE, provide accurate air sampling, and <br />follow the safety procedures. Physical hazards include falls, trips or slips and work around heavy <br />equipment that could increase mechanical hazard. The procedures to prevent this hazard are <br />described on Page 10. <br />A-5 <br />