Appendix 096-695-I - Requirements for Closure of Underground Hazardous Substance Storage Facilities by Filing in Place1. All tanks shall be rendered safe for filling in place by appropriate methods in accordance with industry standards and all applicable state and federal regulations. The owner or operator is responsible for developing a method for making the tank safe.2. Piping shall be drained and flushed into the tank.3. All liquid which can be pumped out, including that liquid requiring a hand pump to remove, shall be removed and any liquids which cannot be used for their originally intended purpose, shall be disposed of in accordance with the Department's Hazardous Waste Management Rules, Chapters 850, 851, 853, and 857; and Hazardous Matter Rules, Chapter 800 and 801.4. The top of the tank shall be exposed and cut open to provide access for cleaning. All tanks to be filled in place shall be properly cleaned.5. The fill (drop) tube shall be removed. Fill, gauge, and product lines shall be disconnected. Open ends of all lines, except the vent line, shall be capped or plugged.6. All tanks which contain class one liquids shall be inerted by a method approved by the Department prior to entering, cleaning, or filling in place.7. A suitable, solid, inert material shall be introduced through the hole in the top of the tank. The following materials are suitable for this purpose: (a) Sand. Sand that is free of rocks is suitable for filing. It may be. poured dry as long as it flows freely. When-the tank is nearly full, sand should be washed into the tank with a nominal amount of water and puddled to cause the sand to flow to the tank ends. The use of large amounts of water shall be avoided.(b) Sand and earth fill. The tank can be filled with sand to about 80% of the calculated capacity, and filled to overflowing for the remaining capacity using a mixture of soil and water in a free-flaking mud.(c) Concrete. Other materials may be used with written approval from the department.
C.M.R. 06, 096, ch. 695, app 096-695-I