(a) Release Detection. Owners and/or operators of UST systems shall provide a method, or combination of methods, of release detection that: - (i) Can detect a release from any portion of the tank and the connected piping that routinely contains a regulated substance;
- (ii) Is installed and calibrated in accordance with the manufacturer's instructions showing that the leak detection equipment is fully operational and in proper calibration;
- (iii) Beginning October 13, 2018, is operated and maintained and electronic and mechanical components are tested for proper operation in accordance with the manufacturer's instructions, PEI RP1200 as referenced in Section 2, or a method determined by the department to be no less protective of health and the environment than other testing methods in this Section; and
- (iv) Meets the performance requirements in Sections 14, 15, 16, 17, or Part M, as applicable, with any performance claims and their manner of determination described in writing by the equipment manufacturer or installer. Methods used shall be capable of detecting the leak rate or quantity specified for that method in Sections 14, 15, 16, 17, or Part M with a probability of detection of 0.95 and a probability of false alarm of 0.05.
(b) Release Reporting. When a release detection method operated in accordance with the performance standards in Sections 14, 15, 16, 17, or Part M indicates a release may have occurred, owners and/or operators shall notify the department in accordance with Part E.
(c) Timing. Owners and/or operators of UST systems shall comply with the release detection requirements of this Part immediately upon installation.
(d) USTs Without Leak Detection. Any owner and/or operator of an UST system that cannot apply a method of release detection that complies with the requirements of this Part shall complete the closure procedures contained in Part G. For previously deferred tank systems described in Parts A and M, this requirement applies on October 13, 2018.
(e) Petroleum USTs with a Capacity of 1,000 Gallons or Less. Owners and/or operators of USTs with a capacity of 1,000 gallons or less may use manual tank gauging as the sole leak detection method for the tank. Manual tank gauging shall be conducted weekly in accordance with Section 15(a).
(f) Petroleum USTs with a Throughput of Less Than 15,000 Gallons per Month. Notwithstanding any other provision of this Chapter, owners and/or operators of USTs with a throughput of less than 15,000 gallons per month may use inventory control as a monthly monitoring technique provided that: - (i) The inventory control balances within 150 gallons per month. In the event that a single month fails to balance within 150 gallons, the operator shall immediately submit that month's data to an outside vendor for Statistical Inventory Reconciliation;
- (ii) The USTs are secured against theft in such a way that any theft is readily obvious; and
- (iii) All requirements listed under Section 16(a) are met.
(g) Piping. Connected piping that routinely contains regulated substances shall be monitored for releases in a manner that meets one of the following requirements: - (i) Pressurized piping systems shall:
- (A) Be monitored in accordance with Section 14(g)(i)(B). Whenever pressure systems have multiple dispensers hooked up to dispense product through a single meter, the pressurized piping between the first dispenser and the slave dispenser shall also be monitored and tested; and
- (B) Be equipped with an automatic line leak detector. Automatic line leak detector methods that alert the owner and/or operator to the presence of a leak by restricting or shutting off the flow of regulated substances through piping or triggering an audible or visual alarm may be used only if they detect leaks of 3 gallons per hour at 10 pounds per square inch line pressure within 1 hour. An annual test of the operation of the leak detector shall be conducted. Manufacturers are required to recommend procedures to be used for testing their equipment, but all automatic line leak detectors shall be tested annually. No manufacturer shall recommend that its equipment not be tested nor interfere with the testing of its equipment in any way. In addition, all underground pressurized piping shall:
- (I) Be tightness tested annually. A periodic test of piping may be conducted only if it can detect a 0.1 gallon per hour (gph) leak rate at one and one-half times the operating pressure; or
- (II) Be monitored using any of the methods listed in Sections 16(d), (e), (f), (g), (h), or (i). Methods not specifically named in these regulations shall be approved by the department prior to use pursuant to Section 33. The request for approval shall state that the method will detect a leak in lines.
- (ii) A U.S. suction system is a system of underground piping that conveys a regulated substance using suction and has more than one check valve in the line. All U.S. suction systems shall:
- (A) Have a line tightness test performed once every 3 years. A periodic test of piping may be conducted only if it can detect a 0.1 gallon per hour leak rate at one and one-half times the operating pressure; or
- (B) Be monitored using any of the methods listed in Section 16(d), (e), (f), (g), (h), or (i). Methods not specifically named in these regulations shall be approved by the department prior to use pursuant to Section 33. The request for approval shall state that the method will detect a leak in lines.
- (iii) Underground piping that conveys regulated substances using an exempt suction system is not required to have a release detection system. An exempt suction system is one that is designed and constructed to meet the following requirements:
- (A) The below-grade piping operates at less than atmospheric pressure;
- (B) The below-grade piping is sloped so that the contents of the pipe will drain back into the storage tank if the suction is released;
- (C) Only one check valve is included in each suction line;
- (D) The check valve is located directly below and as close as practical to the suction pump; and
- (E) A method shall be provided that allows compliance with this Section to be readily determined.
(h) UST System Installations or Replacements on or after December 1, 2005. Regardless of any other Section in this Chapter, all new or replacement installations occurring on or after December 1, 2005, shall meet the following secondary containment criteria: - (i) New or replacement tanks shall be provided with full secondary containment in the form of:
- (A) Double-wall tanks; or
- (B) Single-wall tanks with a polyethylene tank jacket.
- (ii) New or replacement connected piping shall be provided with full secondary containment in the form of:
- (A) Double-wall lines; or
- (B) Single-wall lines with secondary containment piping.
- (iii) All dispensers shall be equipped with full secondary containment in the form of dispenser pans.
- (iv) All secondary containment systems shall be monitored in accordance with Section 16(f). Pressurized piping shall be equipped with an automatic line leak detector in accordance with Section 14(g).
- (v) If mechanical line leak detectors or electronic line leak detectors are being used for leak detection, sump sensors used for interstitial monitoring do not need to meet the 3 gallons per hour leak detection requirement. In these cases, the sump sensors may be placed anywhere in the sump from the lowest point of the sump to no higher than 2 inches below the lowest penetration in the sump.
(i) Interstitially Monitored Pressurized Piping Installed Prior to December 1, 2005. If double-wall piping systems using sumps for interstitial monitoring were installed before December 1, 2005, the owner and/or operator may install mechanical or electronic line leak detectors and perform annual line tightness testing in accordance with Section 14(g)(i)(B)(I) or an alternative tank leak detection method as described in Section 14(g)(i)(B)(II) to meet leak detection requirements. In this case, the owner and/or operator will not be required to perform periodic integrity testing of containment sumps used for interstitial monitoring.
020-1 Wyo. Code R. § 1-14