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CCR,TITLE 23,DIVISION 3,CHAPTER 16,UNDERGROUND STORAGE TANK REGULATIONS 21646, Manual Inventory Reconciliation (a) Manual inventory reconciliation may be used as part of a non-visual monitoring U_ program set forth in section 2643(b)(4)for existing underground storage tanks which contain motor vehicle fuels. E � l 4 oes0 y r' R (b) After January 1, 1993, manual inventory reconciliation shall not be used to comply F— with the requirements of this article where the existing ground water level or the highest anticipated ground water level is less than 20 feet below the bottom of the lank. The ground water level shall be determined in accordance with the requirements of Asection 2649(c), After December 22, 1998,manual inventory reconciliation shall not be used to satisfy underground storage tank monitoring requirements. C 10 (c) Each underground storage tank shall 1?e individually monitored using a method that Eu incorporates the following procedures: m (1) Separate daily measurements shall be,taken and recorded for both the motor vehicle fuel and any water layer. For the purpose of this section, "daily" means at least every day that motor vehicle fuel is added to or withdrawn from the o tank,but no less than five days per week,The number of days may be reduced ,--t tha6 o w by the number of public holidays that occur during the week if there is no input d o y d ^ to or withdrawal from the tank on the holiday. Local agencies may reduce the frequency of monitoring to not less than once every three days at facilities that 0 0 N are not staffed on a regular basis,provided that the monitoring is performed 'y k every day the facility is staffed. Measurements shall be; U (A) taken when no substance is being added to or withdrawn from the tank; 60 o �l `r0 rf (A) perforlmcd by the owner,operator,or other designated persons who have 3 O had appropriate training; (C) based on the average of two readings if dipstick or tape measurements o � �• A� are used; (D) determined by equipment capable of measuring the level of the product o v o o over the full range of the tank's height to the nearest one-eighth of an N o o ofl oo 6 inch. If,dipstick is used to determine the product level,a substance �_ capable of rendering the readings legible shall be applied to the dipstick 3 b ^ 'd Cl 'b before use, if necessary to obtain accurate readings; +n o 4 ❑ � � '3 Y g (F) determined by equipment capable of measuring, to the nearest one-eighth o u of an inch, water present in the bottom of the tank. If a dipstick is used, x water-finding paste shall be applied to the dipstick. if the tank is not level,and the measurements are taken manually, the meamtemcm shall be taken at the lowest end of the tank. 4-11