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b. Permanent Closure. <br /> (1 ) Removal of tank. <br /> (a) Recommended unless not feasible (it will be the <br /> responsibility of the owner/operator to substantiate nonfeasibility). <br /> (b) Permits must be obtained from local county office. <br /> (c) All product must be removed, properly disposed of, and/or <br /> neutralized from tank and piping system observing local County Fire <br /> Department requirements for explosion and fire safety. <br /> (d) Remove fill tube and disconnect gauge, vent and product <br /> delivery lines from tank. <br /> (e) Purge flammable vapors in vessel by approved method such as <br /> displacement by use of Carbon Dioxide which will also render remaining tank <br /> gases inert. 1 .5 pounds of CO2 should be used per 100 gallons of tank <br /> capacity (distributed evenly in crushed form). <br /> (f) Cap or plug all lines and tank openings after tank is <br /> purged. <br /> (g) Uncover tank and remove from excavation. <br /> (h) Any corrosion leak holes must be plugged or capped prior to <br /> removal of tank from site. <br /> (i ) Tank must be provided with 1/8" vent hole which should be <br /> positioned at the uppermost portion of the tank during transport. <br /> (J ) Extreme care must be exercised during all aspects of <br /> handling, removal, and transport of tanks containing flammable vapors. <br /> (k) Prior to backfilling, owner/operator shall determine <br /> whether soil has been contaminated with product. <br /> 1 . Soil sample number and method to be approved by <br /> Permitting Authority. <br /> 2. Soil sampling to be witnessed by Permitting Authority. <br /> 3. Excavation may not be backfilled until results of <br /> soil(s) sample analyses are reviewed by Permitting Authority and it is <br /> determined that there exists no soil contamination by product. All safety <br /> precautions involving excavations must be observed. <br /> 4. If soil analyses indicate contamination by product, <br /> Permitting/Enforcement Authority will provide direction for proper site <br /> mitigation measures. <br /> r <br /> 5 <br />