Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0011 - Water Quality
Chapter 17 - STORAGE TANKS
Part I - AST SYSTEMS
Section 17-36 - AST Leak Detection Requirements

Universal Citation: WY Code of Rules 17-36

Current through September 21, 2024

(a) Methods. No later than October 1, 2008, all owners and/or operators of ASTs covered by this chapter shall provide leak detection for the tank itself using one of the following methods:

(i)Automatic tank gauging. All owners and/or operators of ASTs using this method shall conduct Automatic Tank Gauging in accordance with Section 16(c) of this chapter. All automatic tank gauges used for above ground tanks must be third party certified to meet this requirement in an above ground storage tank application.

(ii)Manual Tank Gauging. Owners and/or operators of ASTs with a capacity of less than 1,320 gallons may be monitored using manual tank gauging as defined by Section 15(a).

(iii)Interstitial Monitoring. Owners and/or operators of ASTs that were constructed under the UL-2085 standard shall monitor the interstitial space between the inner tank and the outer shell. Records shall be kept showing the date of the monitoring, the name of the person doing the monitoring and the results. An automatic system that monitors this method shall be printed out monthly and kept for three (3) years;

(iv)Visual Monitoring of Tank Bottoms. Owners and/or operators of ASTs that are elevated above ground where the entire surface of the tank is visible from beneath shall monitor the tanks monthly for visible signs of leakage. Records of these inspections shall be made showing the date of the inspection, the name of the person doing the inspection, and any sign of leakage noted. Records shall be kept by the owner and/or operator for three (3) years;

(v)Passive Acoustic Sensing. Owners and/or operators of ASTs using this method shall be equipped with a continuous sensing system capable of detecting a release of .2 gallons per hour or a release of 150 gallons per month with a probability of detection of .95 and a probability of false alarm of 0.05. All passive acoustic sensing systems shall produce a written record showing that the system is on and operable. All passive acoustic sensing systems shall be calibrated annually;

(vi)Tracer Surveys conducted on a monthly basis in accordance with Section 16(h) of this Chapter; or

(vii) Other methods approved in accordance with Section 16(j) of this Chapter.

(b) ASTs larger than 100,000 gallons. Owners and/or operators of ASTs with a capacity of 100,000 gallons or more shall follow the inspection requirements of API standard 653.

(c) SPCC Plans. Owners and/or operators of any single AST or combination of more than one AST, with a capacity of 1,320 gallons or more, must have a Spill Prevention Control and Countermeasures (SPCC) plan on file with the department. This is the same document required by the Environmental Protection Agency under 40 CFR 112.

(d) Additional requirements for large facilities. Facilities with above ground capacity of 100,000 gallons or more shall provide at least one additional leak detection method beyond the requirements for Section 36(a). Such methods may be custom designed for the facility at the option of the owner and/or operator, or may be a second method named in Section 36(a). Department approval is required before implementing methods in compliance with this section.

(e) Inventory Control. All owners and/or operators of ASTs shall conduct inventory control in accordance with Section 16(a). This does not meet the additional requirement imposed by Section 36(d).

(f) Operator's Annual Inspection. Owners and/or operators of ASTs shall conduct an annual inspection of all AST systems in accordance with Section 13(e).

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