The agency shall obtain and maintain state delegation of the federal accidental release prevention program established pursuant to subsection (r) of Section 7412 of Title 42 of the United States Code. Substances that are regulated under this article only because they are regulated substances pursuant to paragraph (2) of subdivision (i) of Section 25532 and state threshold quantities shall not be a part of the state program for which delegation of federal implementation and enforcement authority is sought pursuant to this section and subdivision (a) of Section 25533.