COMPLIANCE INFO_1986-1996 - Laserfiche WebLink

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M C CALIFORNIA• t OF • • TITLE 23 WATERS DIVISION 3 STATE WATER RESOURCES CONTROL BOARI CHAPTER r ; - - • rs TANK REGULATIONS (a) Manual tank gauging shall only be used as .. • for existing underground • .•- tanks which have a totalo •, of 111 gallons or • which can be taken out of service for at least 48 continuous hours each week. Underground storage •. of 111 gallons must also receive a tank integrity 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: liquid1 Tank level measurements shall be taken at the beginning af of a gauging period be continuous hoursduring which no liquid is added to or removed •tank. The . underground ..: • • • storagetank shall be .. e•:. 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. •) If the results of a tank integrity test• .. the requirements of subsection 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 or of i