(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, calibrated, operated, and maintained in accordance with the manufacturer's instructions, including routine maintenance and service checks showing that the leak detection equipment is fully operational and in proper calibration; and
- (iii) Meets the performance requirements in Sections 15, 16, or 17, 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 15, 16, or 17 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 15, 16, or 17 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 new or existing 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 in Part G.
(e) Petroleum USTs less than 1000 gallons. Owners and/or operators of USTs with a capacity of one thousand (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. Not withstanding 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 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 of the 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 (1) of the following requirements: - (i) Pressurized piping systems shall:
- (A) Be monitored in accordance with Section 14(g)(i)(B) below. 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 must also be monitored and tested; and
- (B) Be equipped with an automatic line leak detector in accordance with the following: Methods which 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 three (3) gallons per hour at ten (10) pounds per square inch line pressure within one (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 own 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:
- (1) have an annual line tightness test. 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 (1 1/2) times the operating pressure. Tests performed by automatic systems are specifically allowed in meeting this requirement; or
- (2) be tested using any of the methods listed in Section 16(d), (e), (f), (g), (h) or (j). Methods not specifically named in these regulations shall be approved prior to use by the department, pursuant to Section 33, and that approval must state that the method will detect a leak in lines.
- (ii) A U.S. Suction system is a system of underground piping which conveys a regulated substance using suction and which has more than one check valve in the line. All U.S. Suction systems shall:
- (A) have a line tightness test performed once every three (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 (1 1/2) times the operating pressure; or
- (B) be tested using any of the methods listed in Section 16(d), (e), (f), (g) or (j). Methods not specifically named in these regulations may be used if they are approved prior to use by the department, pursuant to Section 33 and that approval must state that the method will detect a leak in the 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) New UST installations and repairs. Regardless of any other section in this chapter, after the effective date of this chapter, all new and replacement installations and repairs of existing piping 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 Walled 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. And
- (iii) All dispensers must 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).
020-17 Wyo. Code R. § 17-14