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TITLE 23 WATER CON'iRC)L BOARD §2672 (Rpbpr a6,Na 33-&1746) (p. 96.8.15) (b) Owners of underground storage tanks proposing to remove the under- ground storage tank shall comply with applicable provisions of Chapter 6.5 of Division 20 of the Health and SafetyCode,in addition to the following: (1) All residual liquid,solids, or sludges shall be removed. (2) If the underground storage tank contained a hazardous substance that could produce flammable vapors at standard temperature and pressure, then the underground storage tank,either in part or as a whole,shall be pur ed of the flammable vapors to levels that would preclude explosion or such lower levels as may be required by the local agenvy. (3) When an underground storage tank or any part of an underground stor- age tank is to be disposed of,the owner must document to the local agency that proper disposal has been completed. (4) An owner of an underground storage tank or any part of an underground storage tank that is destined for a specific reuse shall identify to the local agency the future underground storage tank owner, operator, location of use, and nature of use. (5) An owner of an underground storage tank or any part of an underground storage tank that is destined for reuse as scrap material shall identify this reuse to the local agency. (c) Closure of underground storage tanks in place shall comply with the applicable rovisions of Chapter 6.5 of Division 20 of the Health and Safety Code,in addition to all of the following: (1) All residual liquid, solids,or sludges shall be removed. (2) All pi mg associated with the underground storage tank shall be removed and disposed of unless removal might damage structures or other pipes that are being used and that are contained in a common trench,in which case the piping to be closed shall be emptied of all contents and capped. (3) The underground storage tank,except for the pipingthat is closed pursu- ant to subsection (2) of this subsection,shall be completely filled with an inert solid, unless the owner intends to use the underground storage tank for the storage of a nonhazardous substance which is compatible with the previous use of the underground storage tank. (4) A notice shall be placed in the deed to theroperty. The notice shall areal location of the clo describe the exact vertical and p sed underground storage tank, the hazardous substances it contained, and the closure method. (d) The owner of an underground storage tank being closed pursuant to this section shall demonstrate to the satisfaction of the local agency that no unau- thorized release has occurred.This demonstration can be based on the ongoing I eak detection monitoring, ground water monitoring, or soils sampling per- formed during or immediately after closure activities. If feasible,soil samples shall be taken and analyzed according to the follow- mg: (1) If the underground storage tank or any portion thereof is removed,then soil samples from the soils immediately beneath the removed portions shall be taken. A separate sample shall be taken for every 200 square-feet for under- ground storage tanks or every 20 lineal-feet of trench for piping,at a minimum. (2) If the underground storage tank or any portion thereof is not removed, soils sampling pursuant to Section 2645 of Article 4 of this subchapter shall be implamented, if feasible. (3) Soils shall be analyzed for all constituents of the previously stored d- ous substances and thew breakdown or transformation products. DPp0