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' BANKS & CO 4 UNDERGROUND TANK REMOVAL PROCEDURES ' 4. 1 REMOVING RESIDUAL COMBUSTIBLE OR FLAMMABLE LIQUIDS FROM PIPING AND TANK Banks & Co. will be responsible for removing residual liquids in the tank ' by hand pump or other suitable method. All residual liquids removed are considered hazardous waste and must be placed in Department of Transportation approved containment for disposal . Banks & Co. is responsible for disposal of ' the residual liquids. If liquid in the piping has not drained to the tank by gravity, the liquid must be collected at the low point in the piping to prevent liquid coming in contact with soil . ' 4.2 PAVED AREAS Swanson D.C.R. shall remove asphalt and/or concrete cover as necessary to ' expose the storage tank and piping. Swanson D.C.R. is responsible for disposal of all removed concrete or asphalt and shall remove sufficient soil to expose the tank and piping. Others will investigate the area at this time for evidence of hydrocarbons. 4.3 DISCONNECTING AND RINSING PIPING ' All piping shall be disconnected at a point farthest away from the tanks. Liquid inside the piping will be drained, collected and properly disposed of. The piping shall then be thoroughly rinsed using a water/tri-sodium phosphate solution (or equivalent) back into the tank or rinseate collection vessel . 4.4 INERT TANKS Flammable vapors will be expelled by inserting into the tank a minimum of 2 pounds of solid carbon dioxide (dry ice) per 100 gallons of tank volume. ' All piping shall be disconnected from the tank and all tank openings securely sealed. One 1/8-inch vent hole will be left at the high point of the tank to allow flammable vapors to escape. iA minimum of four hours must be allowed for the vapors to escape, once the dry ice has been introduced into the tank and the tank properly sealed. To verify that flammable vapors have been adequately expelled, the inspector will periodically measure the combustion gas level at both tank ends. The tanks will be considered gas free when the oxygen content is below 10% and the explosion level is below 5% of the LEL. ' 4.5 TANK AND PIPING REMOVAL ' Any soil suspected to contain hydrocarbons will be segregated and placed on 10 mil . plastic sheeting or the equivalent. Banks & Co. will segregate hydrocarbon impacted soils and non-hydrocarbon impacted soils into two separate areas. Underground tanks shall be lifted from the excavations with a crane or backhoe of sufficient weight capacity, and placed on smooth ground free of rocks and/or other foreign objects for inspection. Banks & Co. is responsible for removal of any spillage from the piping or tanks that are handled such that 1 spillage occurs. 6 SITE SAFETY PLAN