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C <br />CALIFORNIA <br />a •, OF <br />REGULATIONS <br />DIVISIONTITLE 23 WATERS <br />RESOURCES CONTROL • <br />UNDERGROUNDCHAPTER 16 •'` <br />SECTIONARTICLE 4, O <br />Inventory r«• • only be • as part of .n -visual monitoring for existing <br />underground • .•c tanks which contain motor <br />stick(b) After January 1. 1993, inventory reconciliation, and any other leak detection method that <br />utilizeds manual • not be • as part of •n -visual monitoring for existing <br />Inventoryunderground 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 />• •n that utilizes manual stick readingsnot • - used after December <br />22, 1998. <br />• Owners or operators of • underground storage tanks who utilize inventory <br />reconciliation apart of •n -visual monitoring shall comply with the requirements of <br />section. <br />(e) Each underground storage tank shall be individually monitored utilizing an inventory <br />reconciliation system that takes into account: <br />( 1) Separate daily underground storage tank quantity measurements for both the 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 comply with California Code <br />MeasuresRegulations, Title 4, Chapter 9, Subehapter 1, wTolerances and specifications for commercial <br />weighing and measuring devices.0 Meters shall be inspected by the County Department of <br />Weights and <br />professions Code, <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 />