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CALIFORNIA CODE OF REGULATIONS TITLE 23 WATERS DIVISION 3 R ATE WATER 16 UNDERGROUND UTANK REGURCES LATIONS OL RD CHAPTER ARTICLE 4, SECTION 2646. INVENTORY RECONCILIATION (a) Inventory reconciliation shall only be use mo o Pvart of eh cle on-vifuelssual monitoring for existing underground storage tanks which conta ( b ) After January 1, 1993, inventory reconciliation, and any other leak detection method that utilizeds manual stick readings, shall nosubstance including motors part of non-visual lvering for hice fuel,underground storage tanks containing a hazardous where the existing ground water level or the highest anticipated ground water level is less than 20 feet below the bottom of the canon 2649 ()round of this ae clevels shall be determined according to the requirements o ( c) Inventory reconciliation that utilizes manual stick readings s all 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 undergroundstorage tankquantitymeasurements for both the stored hazardous substance and ana y layer; ( 2 ) Daily readings for underground storage tank input and withdrawals; and ( 3 ) Checking of product inputs indicated by delivery re eipt 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. with ( f ) Meters used for determining inputs and withdrawals 7oleranclesceandlyspec ficatioons'foCcommercial ode of Regulations, Title 4, Chapter 9, Subchapter weighing and measuring devices." Mea'fmanshall as defined in the Cal'forn'aCounty BuDness andt of Weights and Measures or a device rep professions Code, Division 5, Chapter 5.5. 1 (9) For the purpose of this section, "daily" means at least 5 days per week. The number of days involved may be reduced by the numberoofpublic nitormg t no less than on1ce every 3 days at ng any such week. Local agencies may reduce the rounded that the monitoring is performed on facilities that are not staffed on a regular basis, p every day the facility is staffed or when inputs or withdrawals are made from the undergrounc storage tank.