A. Any unauthorized release from the primary containment which the operator is able to clean up within eight hours after the release was detected or should reasonably have been detected, and which does not escape from the secondary containment does not increase the hazard of fire or explosion, and does not cause any deterioration of the secondary containment of the underground storage tank, shall be recorded on the operator's monitoring reports.
B. Any unauthorized release which escapes from the secondary containment, increases the hazard of fire or explosion, or causes any deterioration of the secondary containment of the underground tank shall be reported by the operator to the permitting authority within 24 hours after the release has been detected or should have been detected. A full written report shall be transmitted by the owner or operator of the underground storage tanks within five working days of the occurrence of the release.
C. The permitting authority shall review the permit whenever there has been an unauthorized release or when it determines that the underground storage tank is unsafe. In determining whether to modify or terminate the permit, the permitting authority shall consider the age of the tank, the methods of containment, the methods of monitoring, the concentration of the hazardous substances stored in the tank, the severity of potential unauthorized releases, and the suitability of any other long-term preventive measures which would meet the requirements of this chapter.
D. If there has not been any unauthorized release from the primary containment, from an underground storage tank containing motor vehicle fuel not under pressure, the permit holder may line the interior of the tank as a preventative measure by an interior-coating process if the tank meets all of the following requirements, and the tank has a manway (manway is defined as a portal allowing a person to enter into the tank); if the tank does not have a manway, cutting into the tank to make entry shall be prohibited:
1. The tank has not previously been repaired or relined;
2. An ultrasonic test has been conducted to determine the thickness of the storage tank;
3. Certification by a special inspector that the shell will provide structural support for the interior lining. The special inspector shall make this certification by entering and inspecting the entire interior surface of the tank and shall base this certification upon the following procedures and criteria:
a. If the tank is made of fiberglass, the tank is cleaned so that no residue remains on the tank wall surface. The special inspector shall take interior diameter measurements and, if the cross-section has compressed more than one percent of the original diameter, the tank shall not be certified and shall also not be returned to service. The special inspector shall also conduct an interior inspection to identify any area where compression or tension cracking is occurring and shall determine whether additional glass fiber reinforcing is required for certification before the tank may be lined,
b. If the tank is made of steel, the tank interior surface shall be abrasive blasted completely free of scale, rust, and foreign matter, as specified in the American Petroleum Institute's recommended practice 16-31, relating solely to white metal blasting. The special inspector shall sound any areas showing corrosion pitting with a brass ball peen hammer to attempt to break through a potentially thin steel area. Tanks that have any perforations, open seams, or splits shall not be returned to service,
c. If the person conducting the test determines that the test results indicate that the tank has a serious corrosion problem, the permitting authority may require additional corrosion protection for the tank or may prohibit the permit holder from lining the tank;
4. The material used to line the tank by an interior-coating process is compatible with the motor vehicle fuel that is stored, as approved by the board by regulation;
5. The material used to line the tank by an interior-coating process is applied in accordance with the materials manufacturer's specifications and by the procedures approved by the underwriter's laboratory;
6. All steel tanks with corrosion that are subsequently lined must be retrofitted with a cathodic protection system that is designed by an independent corrosion expert and operated in accordance with nationally recognized standards;
7. Before the tank is placed back into service following the interior-coating process, the tank is tested in the operating condition using the precision test defined by the National Fire Protection Association Pamphlet 329, "Recommended practice for handling underground leakage of flammable and combustible liquids," as amended, for proving the integrity of an underground storage tank. (Prior code § 16.01.150)