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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 2645 MANUALTANK GAUGING AND TESTING (a) Manual tank gauging shall only be used as part of non -visual monitoring for existing underground storage tanks which have a total system capacity of 2,000 gallons or less and which can be taken out of service for at least 48 continuous hours each week. Underground storage tanks with a capacity of 551-2,000 gallons must also receive a tank integrity test each year. (b) Manual tank gauging shall not be used on tanks with secondary containment and shall not be used as part of a non -visual monitoring alternative under this article after December 22, 1998 for underground storage tanks with a capacity of 1,001 gallons or greater. (c) Owners of existing underground storage tanks who utilize manual tank gauging as part of a non -visual monitoring alternative shall, at a minimum, conduct weekly gauging according to the following specifications: (1) Tank liquid level measurements shall be taken at the beginning and ending of a gauging period which shall be at least 36 continuous hours during which no liquid is added to or removed from the tank. The underground storage tank shall be secured to prevent inputs or withdrawals during the gauging period. No inputs shall occur within the 12 - hour period preceding the gauging period. The liquid level measurements shall be based on an average of two consecutive stick readings at both the beginning and ending of the period; and (2) The equipment used shall be capable of measuring the level of the product over the full range of the tank's height to the nearest one-eighth of an inch; and (3) If the variation between beginning and ending measurements exceeds the weekly or monthly standards set forth in Table 4.1; a second 36 hour test shall be commenced immediately and all measurements and calculations checked for possible errors. If the second test confirms a variation which exceed the weekly or monthly standards in Table 4.1, then an unauthorized release shall be suspected and a tank integrity test shall be conducted within 72 hours. The local agency may extend this 72 -hour period up to 30 calendar days, if all the contents of the underground tank are safely and properly removed within the 72 -hour period. (d) If the results of a tank integrity test conducted under the requirements of subsection (c) (3) of this setion confirm an unauthorized release, the owner shall comply with the requirements of Article 5 of this chapter and replace, repair, or close the underground storage tank in accordance with Article 3, 6, or 7 of this chapter.