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(2) 1f locked caps are utilized, then at least one shall be removed to (c) Owners of underground storage tanks subject to permanent closure where the determine if any liquids or other substances have been added to the tanksare approved to be closed in place shall comply with the applicable underground storage tank or if there has been a change in the quantity or provisions of Chapters 6.5 and 6.7 of Division 20 of the Health and Safety type of liquid added pursuant to subsection (a)(3) of this section. Code and with the following requirements: (d) The owner may terminate the temporary closure and reuse the underground (1) All residual liquid, solids, or sludges shall be removed and handled as a storage tank only if the local agency approves the reuse according to the hazardous waste or recyclable materials in accordance with Chapters 6.5 requirements specified in sections 2662, 2663, and 2664. and 6.7 of the Health and Safety Code. Authority: Health and Safety Code 25299.3, 25299.7 (2) All piping associated with the underground storage tank shall be removed and disposed of unless removal might damage structures or other pipes Reference: Health and Safety Code 25298 that are being used and that are contained in a common trench, in which 40 CFR 280.70 case the piping to be closed shall be emptied of all contents and capped. 2672. Permanent Closure Requirements (3) The underground storage tank, except for piping that is closed pursuant to subsection (2) of this section, shall be completely filled with an inert solid, unless the owner intends to use the underground storage tank (a) Owners of underground storage tanks subject to permanent closure shall comply for the storage of a nonhazardous substance which is compatible with the with either subsection (b) of this section for underground storage tank previous use of the underground storage tank and its construction. removal or subsection (c) of this section for closure in place. It is not essential that all portions of an underground storage tank be permanently (d) The owner of an underground storage tank being closed pursuant to this closed in the same manner; however, all actions shall comply with the section shall demonstrate to the satisfaction of the local a9ency that no appropriate subsection of this section. Subsections (d) and (e) of this unauthorized release has occurred. This demonstration shall be based on soil section regarding no discharge demonstration applies to all underground sample analysis and/or water analysis if water is present in the excavation. storage tanks subject to permanent closure. This analysis shall be performed during or immediately after closure activities. If the demonstration is based on soil sample analysis, soil (b) Owners of underground storage tanks subject to permanent closure shall comply samples shall be taken and analyzed according to the following requirements: with applicable provisions of Chapter 6.5 of Division 20 of the Health and Safety Code and with the following requirements: (1) If pthe underground storage tank or any portion thereof ppis removed, soil sam(1) All residual liquid, solids, or sludges shall be removed, and handled as tank,ea minimum s shall eofatwo feken et into lnativeamaterial th the eaveachoend of the rt ions of the a hazardous waste or recyclable materials in accordance with Chapter 6.5 in accordance with section 2649. A separate sample shall be taken for of the Health and Safety Code. each 20 lineal-feet of trench for piping. (2) If the underground storage tank contained a hazardous substance that (2) If the underground storage tank or any portion thereof is not removed, at J could produce flammable vaporsat standard temperature and pressure, then least one boring shall be taken as close as possible to the midpoint the underground storage tank shall be inerted to levels that shall beneath the tank utilizing a slant boring (mechanical or manual), or preclude explosion or such lower levels as may be required by the local other appropriate method such as vertical borings drilled on each long agency. dimensional side of the tank. if the depth to ground water is less than 20 feet, then a ground water monitoring well shall be installed adjacent (3) when an underground storage tank or any part of an underground storage to the tank and/or piping in the verified downgradient direction. tank is to be disposed of, the owner must document to the local agency , l that proper disposal has been completed. This documentation shall be (3) Soils shall be analyzed in accordance with section 2649 for all submitted within the time frame specified by the local agency. constituents of the previously stored hazardous substances and their (4) An owner of an underground storage tank or any part thereof that is breakdown requirement or transformation products. The local agency may waive the for analysis of all constituents, breakdown or transformation destined for a specific reuse shall advise the local agency, within the products when key constituents that pose a significant threat to water time frame specified by that agency, of: quality or the environment can be identified for analysis. (A) The name of the new owner of the underground storage tank; (e) The detection of any unauthorized release shall require com liance with the B Name of the new operator; reporting requirements of Article 5 of this chapter. P C The location of use; and D Nature of use. Authority: Health and Safety Code 25299.3, 25299.7 Reference: Health and Safety Code 25298 40 CFR 280.71 7.3 7.4 iL'4 recommendations from impacted local agent its.