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CALIFORNIAiREGULATIONS <br />TITLE 23 WATERS <br />DIVISION - RESOURCES CONTROL- i <br />CHAPTER 16 UNDERGROUND TANK REGULATIONS <br />(a) Inventory reconciliation shall only be used as part of non -visual monitoring for existi <br />underground storage tanks which contain motor vehicle fuels. I <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 existil <br />underground storage tanks containing a hazardous substance including motor 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 to the requirements of section 2649 (c) of this article. <br />• reconciliationreadings shall not be used after December <br />22, .. <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 />(e) Each underground storage tank shall be individually monitored utilizing an inventory <br />reconciliation • •,• <br />Separate daily underground storage tank quantity measurements for both the storet! <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, aTolerances and specifications for commerciaU, <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 />