SITE INFORMATION AND CORRESPONDENCE_FILE 1

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CCR, TITU 23, DIVISION 3, CIIAPTER 16, UNDERGROUND STORAGE TANK REGULATIONS (3) All piping 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. i (4) The underground storage tank, except for piping that is closed in accordance with subdivision (3), 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 and construction of the underground storage tank. (d) The owner or operator of an underground storage tank being closed pursuant to this section shall demonstrate to the satisfaction of the local agency that no unauthorized release has occurred. This demonstration shall be based on soil sample analysis and/or water analysis if water is present in the excavation. This analysis shall be performed during or immediately after closure activities. If the demonstration is based on soil sample analysis, soil samples shall be taken and analyzed as follows: (1) if the underground storage tank or any portion thereof is removed, soil samples shall be taken immediately beneath the removed portions of the tank, a minimum of two feet into native material at each end of the tank in accordance with section 2649. A separate sample shall be taken for each 20 lineal-feet of trench for piping. (2) If the underground storage tank or any portion thereof is not removed, at least one boring shall be taken as close as possible to the midpoint beneath the tank using a slant boring (mechanical or manual), or other appropriate method such as vertical borings drilled on each long dimensional side of the tank as approved by the local agency. (3) Soils shall be analyzed in accordance with section 2649 for all constituents of the previously stored hazardous substances and their breakdown or transformation products. The local agency may waive the requirement for analysis of all constituents, breakdown or transformation products when key constituents that pose a significant threat to crater quality or the environment can be identified for analysis. (e) The detection of any reportable unauthorized release shall require compliance with the applicable requirements of Articles 5 and 11. Authority: Health and Safety Code 25299.3, 25299.7. and 25299.77 Reference: Health and Safety Code 25298, 25299.37; 40 CFR 280.60 through 280.67. 280.71, and 281.36 7 - 5 _q1.