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CCR,TITLE 23,DIV IStON 3,CHAPTER 16,UNDERGROUND STORAGETANK REGLFLATEON5 CCR,TITLE 23,DIvisiON 3,CHAPTER 16,UNDERGROUND STORAGE TANK REGULATIONS gallon per hour from any portion of the tank at any product level. shall also have an annual tank integrity test unless the gauging period is 60 hours or more. Requirements of section 2643(b)do not apply to tanks which are monitored in Authority: Health and Safety Code 25299.3,25244.7 accordance with this section. Reference: health and Safety Code 25292,40 CFR 280.40-280.45 (c) Manual lank gauging shall not be used on tanks with secondary containment and shall not be used as a leak detection method after December 22, 1998, for underground 2644. Non-visual Mork itoringlQualhativc Release Detection Methods storage tanks with a capacity greater than 1,000 gallons. d (a) An owner or operator who is required,pursuant to section 2641 to estahO Owners oroperators a non- of existing underground storage tanks who use manual tank visual monitoring program,shall comply with the requirements of this section if a gauging as part of a non-visual monitoring program shall conduct weekly gauging qualitative release detection method is used. Each qualitative release detection method, according to the following specifications: including interstitial monitors,shall have an independent third-party evaluation to O 1 Tank liquid level measurements shall be taken at the beginning and end of a certify accuracy and response time of the detection method in accordance with gauging period which shall beq least de or 60 continuous hours t set Forth in procedures in Appendix iV, Examples of qualitative release detection methods that Table 4.l during which no liquid is added to or removed from the tank. The may be used are in Appendix III• underground storage tank shall be secured Io prevent input or withdrawals (b) If vadose zone monitoring is used as a release detection method, it shall he conducted during the gauging period. No product shall be added to the tank within the 12- in accordance with section 2647. 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 (c) if ground water monitoring is used as a release detection method, it shall be conducted and end of the gauging period;and, in accordance with section 2648. (2) The equipment used shall be capable of measuring the level of the produce over (d) A qualitative release detection method which includes the installation of monitoring the full range of the tank's height to the nearest one-eighth of an inch;and, wells or drilling other borings shall comply with installation,construction,and sampling and analysis procedures in section 2649. (3) If the variation between beginning and ending measurements exceeds the weekly or monthly standards set forth in'rable 4.I,a second 36-hour or 60-hour test (e) Underground pressurized piping that is monitored at least monthly by a non-visual shall begin immediately and all measurements and calculations checked for qualitative release detection method satisfies the annual tightness test requirement of possible errors. If the second test confirms a variation which exceeds the section 25292(e)of the Health and Safely Code. weekly or monthly standards in Table 4.1,a tank integrity test shall be conducted within 72 hours of completion of the second test. The local agency Authority: Health and Safety Code 25299.3,25299.7 may extend this 72-hour period up to 30 calendar days, if all contents of the Reference: Health and Safety Code 25292;40 CFR 280.43 underground storage tank are safely and properly removed within the 72-hour period. (e) If the results of a tank integrity test confirm an unauthorized release,the owner or 2645.Manual Tank Gauging and resting for Small Tanks operator shall comply with the release reporting requirements of Article 5 and shall (a) Manual tank gauging may be used as part of a non-visual monitoring program for replace, repair,upgrade,or close the underground storage lank in accordance with the li existing underground storage tanks which have a total system capacity of 2.000 gallons applicable Provisions of this chapter. or less and which can be taken out of service for at least 48 or 72 continuous hours Authority: Health and Safety Code 25299.3 and 25299.7 each week as indicated in Table 4.1. Reference: Health and Safety Code 25292 and 25293,40 CFR 280.43 (b) Manual tank gauging shall be conducted weekly in accordance with subsection(d). Piping testing shall be conducted in accordance with section 2643(c),(d),or(e). Tanks with a capacity of 1.001 to and including 2,000 gallons shall also receive a tank integrity test each year. 'Tanks with a capacity of 551 to and including 1,000 gallons 4-10 4-9