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CALIFORNIAi iREGULATIONS <br />TITLE 23 WATERS <br />DIVISION 3 STATE WATER RESOURCES CONTROL BOARD <br />CHAPTER 16 UNDERGROUND REGULATIONS <br />-MMMIFORY&I .. <br />(a) Inventory reconciliation shall only be used as part of non -visual monitoring for existi <br />undergroundstoragetanks whichcontainf• <br />(b) After January 1, 1993, inventory reconciliation, and any other leak detection method that <br />utilizeds manual stick readings, shall not be used as part of non -visual monitoring for existing <br />underground • ..Y^tankscontaininga hazardoussubstance•.':f •.#. vehicle fuel, <br />where the existing ground water level or the highest anticipated ground water level is less <br />than 20 feet below the bottom of the tank. These ground water levels shall be determined <br />according ithe requirementsofsection2649 of <br />(c) Inventory reconciliation that utilizes manual stick readings shall not be used after December <br />22, 1998. r. <br />(d) Owners or operators of existing underground storage tanks who utilize inventory <br />reconciliation as part of non -visual monitoring shall comply with the requirements of this <br />Each <br />underground s# # tank shallbeindividually utilizingan inventory <br />reconciliation system that takes into account: <br />Separatedailyunderground .•:rage t.: quantityy ' •.' both . stored <br />hazardous substance and any water layer; <br />(3) Checking of product inputs indicated by delivery receipt by measurement of the tank <br />inventory volume before and after delivery. Underground storage tanks that are <br />connected by a manifold may require time for the level to stabilize before a <br />measurement is taken. <br />�f) Meters used for determining inputs and withdrawals shall comply with California Code of <br />Regulations, Title 4, Chapter 9, Subchapter 1, wTolerances and specifications for commercial <br />weighing and measuring devices.* Meters shall be inspected by the County Department of <br />Weights and Measures or a device repairman as defined in the California Business and <br />professions Code, Division 5, Chapter 5.5. <br />(g) For the purpose of this section, "daily" means at least 5 days per week. The number of days <br />involved may be reduced by the number of public holidays that occur during any such week. <br />Local agencies may reduce the frequency of monitoring to no less than once every 3 days at <br />facilities that are not staffed on a regular basis, provided that the monitoring is performed on <br />every day the facility Is staffed or when inputs or withdrawals are made from the underground <br />storage <br />