(1) Storage tanks constructed after the adoption date of this section must meet or exceed the 1993 version of the National Fire Protection Association (NFPA No. 30) requirements and one of the following design and manufacturing standards:

(a) UL No. 142, Steel Aboveground Tanks for Flammable and Combustible Liquids dated April 1993;

(b) API Standard 650, Welded Steel Tanks for Oil Storage dated November 1988;

(c) API Standard 620, Design and Construction of Large Welded, Low-Pressure Tanks dated June 1990; or

(d) Another standard approved by ecology.

(2) The owner or operator must ensure that the means of preventing storage tank overfill comply with the 1993 version of the National Fire Protection Association (NFPA), Flammable and Combustible Code, No. 30, Chapter 2, Section 2-10.

(3) Storage tanks must be maintained, repaired and inspected in accordance with the requirements of API 653 dated January 1991, unless the operator proposes an equivalent inspection strategy which is approved by ecology.

(4) A record of all inspection results and corrective actions taken must be kept for the service life of the tank and must be available to ecology for inspection and copying upon request.