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CALIFORNIA CODE OF REGULATIONS TITLE 23 WATERS DIVISION 3 STATE WATER RESOURCES CONTROL BOARD CHAPTER 16 UNDERGROUND TANK REGULATIONS ARTICLE 4,SECTION 2646. INVENTORY RECONCILIATION (a) Inventory reconciliation shall only be used as part of non-visual monitoring for existing underground storage tanks which contain motor vehicle fuels. ( b ) After January 1, 1993, inventory reconciliation, and any other leak detection method that utilizeds manual stick readings, shall not be used as part of non-visual monitoring for existing underground storage tanks containing a hazardous substance including motor vehicle fuel, where the existing ground water level or the highest anticipated ground water level is less than 20 feet below the bottom of the tank. These ground water levels shall be determined according to the requirements of section 2649 (c) of this article. (c) Inventory reconciliation that utilizes manual stick readings shall not be used after December 22, 1998. (d) Owners or operators of existing underground storage tanks who utilize inventory reconciliation as part of non-visual monitoring shall comply with the requirements of this section. (e) Each underground storage tank shall be individually monitored utilizing an inventory reconciliation system that takes into account: ( 1 ) Separate daily underground storage tank quantity measurements for both the stored hazardous substance and any water layer; ( 2 ) Daily readings for underground storage tank input and withdrawals; and ( 3 ) Checking of product inputs indicated by delivery receipt by measurement of the tank inventory volume before and after delivery. Underground storage tanks that are connected by a manifold may require time for the level to stabilize before a measurement is taken. ( f ) Meters used for determining inputs and withdrawals shall comply with California Code of Regulations, Title 4, Chapter 9, Subchapter 1, "Tolerances and specifications for commercial weighing and measuring devices." Meters shall be inspected by the County Department of Weights and Measures or a device repairman as defined in the California Business and professions Code, Division 5, Chapter 5.5. (g ) For the purpose of this section, "daily' means at least 5 days per week. The number of days involved may be reduced by the number of public holidays that occur during any such week. Local agencies may reduce the frequency of monitoring to no less than once every 3 days at facilities that are not staffed on a regular basis, provided that the monitoring is performed on every day the facility is staffed or when inputs or withdrawals are made from the underground storage tank.