(a) Administrative Rules of Montana 17.8.309(5)(b) and 17.8.310(3)(e) of the State's rule regulating fuel burning, which were submitted by the Governor on April 14, 1999 and which allow terms of a construction permit to override a requirement that has been approved as part of the SIP, are disapproved. We cannot approve these provisions into the SIP, as it would allow the State to change a SIP requirement through the issuance of a permit. Pursuant to section 110 of the Act, to change a requirement of the SIP, the State must adopt a SIP revision and obtain our approval of the revision.

(b)(1) In 40 CFR 52.1370(c)(51), we incorporated by reference several documents that comprise the East Helena Lead SIP. Sections 52.1370(c)(51)(i)(B) and (C) indicate that certain provisions of the documents that were incorporated by reference were excluded. The excluded provisions of § 52.1370(c)(51)(i)(B) and (C) are disapproved. These provisions are disapproved because they do not entirely conform to the requirement of section 110(a)(2) of the Act that SIP limits must be enforceable, nor to the requirement of section 110(i) that the SIP can be modified only through the SIP revision process. The following phrases, words, or section in exhibit A of the stipulation between the Montana Department of Environmental Quality (MDEQ) and Asarco, adopted by order issued on June 26, 1996 by the Montana Board of Environmental Review (MBER), are disapproved:

(i) The words, “or an equivalent procedure” in the second and third sentences in section 2(A)(22) of exhibit A;

(ii) The words, “or an equivalent procedure” in the second and third sentences in section 2(A)(28) of exhibit A;

(iii) The words, “or an equivalent procedure” in the second sentence in section 5(G) of exhibit A;

(iv) The sentence, “Any revised documents are subject to review and approval by the Department as described in section 12,” from section 6(E) of exhibit A;

(v) The words, “or a method approved by the Department in accordance with the Montana Source Testing Protocol and Procedures Manual shall be used to measure the volumetric flow rate at each location identified,” in section 7(A)(2) of exhibit A;

(vi) The sentence, “Such a revised document shall be subject to review and approval by the Department as described in section 12,” in section 11(C) of exhibit A;

(vii) The sentences, “This revised Attachment shall be subject to the review and approval procedures outlined in Section 12(B). The Baghouse Maintenance Plan shall be effective only upon full approval of the plan, as revised. This approval shall be obtained from the Department by January 6, 1997. This deadline shall be extended to the extent that the Department has exceeded the time allowed in section 12(B) for its review and approval of the revised document,” in section 12(A)(7) of exhibit A; and

(viii) Section 12(B) of exhibit A.

(2) Paragraphs 15 and 16 of the stipulation by the MDEQ and Asarco adopted by order issued on June 26, 1996 by the MBER are disapproved. Paragraph 20 of the stipulation by the MDEQ and American Chemet adopted by order issued on August 4, 1995 by the MBER is disapproved.

(c) Administrative Rules of Montana 17.8.324(1)(c) and 2(d) (formerly ARM 16.8.1425(1)(c) and (2)(d)) of the State's rule regulating hydrocarbon emissions from petroleum products, which were submitted by the Governor on May 17, 1994 and later recodified with a submittal by the Governor on September 19, 1997, and which allow the discretion by the State to allow different equipment than that required by this rule, are disapproved. Such discretion cannot be allowed without requiring EPA review and approval of the alternative equipment to ensure that it is equivalent in efficiency to that equipment required in the approved SIP.

(d) In § 52.1370(c)(46), we approved portions of the Billings/Laurel Sulfur Dioxide SIP and incorporated by reference several documents. This paragraph identifies those portions of the Billings/Laurel SO2 SIP that have been disapproved.

(1) In § 52.1370(c)(46)(i)(A) through (G), certain provisions of the documents incorporated by reference were excluded. The following provisions that were excluded by § 52.1370(c)(46)(i)(A) through (G) are disapproved. We cannot approve these provisions because they do not conform to the requirements of the Clean Air Act:

(i) The following paragraph and portions of sections of the stipulation and exhibit A between the Montana Department of Environmental Quality and Cenex Harvest Cooperatives adopted by Board Order issued on June 12, 1998, by the Montana Board of Environmental Review:

(A) Paragraph 20 of the stipulation;

(B) The following phrase from section 3(B)(2) of exhibit A: “or in the flare”; and

(C) The following phrases in section 4(D) of exhibit A: “or in the flare” and “or the flare.”

(ii) Paragraph 20 of the stipulation between the Montana Department of Environmental Quality and Conoco, Inc., adopted by Board Order issued on June 12, 1998, by the Montana Board of Environmental Review.

(iii) The following paragraphs and portions of sections of the stipulation and exhibit A between the Montana Department of Environmental Quality and Exxon Company, USA, adopted by Board Order issued on June 12, 1998, by the Montana Board of Environmental Review:

(A) Paragraphs 1 and 22 of the stipulation;

(B) The following phrase of section 3(E)(4) of exhibit A: “or in the flare”; and

(C) The following phrases of section 4(E) of exhibit A: “or in the flare” and “or the flare.”

(iv) Paragraph 20 of the stipulation between the Montana Department of Environmental Quality and Montana Power Company, adopted by Board Order issued on June 12, 1998, by Montana Board of Environmental Review.

(v) The following paragraphs and sections of the stipulation and exhibit A between the Montana Department of Environmental Quality and Montana Sulphur & Chemical Company, adopted by Board Order issued on June 12, 1998, by the Montana Board of Environmental Review: paragraphs 1, 2 and 22 of the stipulation; sections 3(A)(1)(a) and (b), 3(A)(3), and 3(A)(4) of exhibit A.

(vi) Paragraph 20 of the stipulation between the Montana Department of Environmental Quality and Western Sugar Company, adopted by Board Order issued on June 12, 1998, by the Montana Board of Environmental Review.

(vii) Paragraph 20 of the stipulation between the Montana Department of Environmental Quality and Yellowstone Energy Limited Partnership, adopted by Board Order issued on June 12, 1998, by the Montana Board of Environmental Review.

(2) Section (3)(A)(2) of exhibit A of the stipulation between the Montana Department of Environmental Quality and Montana Sulphur & Chemical Company, adopted by Board Order issued on June 12, 1998, by the Montana Board of Environmental Review, which section 3(A)(2) we approved for the limited purpose of strengthening the SIP, is hereby disapproved. This limited disapproval does not prevent EPA, citizens, or the State from enforcing section 3(A)(2).

(e) In 40 CFR 52.1370(c)(52), we approved portions of the Billings/Laurel Sulfur Dioxide SIP for the limited purpose of strengthening the SIP. Those provisions that we limitedly approved are hereby limitedly disapproved. This limited disapproval does not prevent EPA, citizens, or the State from enforcing the provisions. This paragraph identifies those provisions of the Billings/Laurel SO2 SIP identified in 40 CFR 52.1370(c)(52) that have been limitedly disapproved.

(1) Sections 3(B)(2) and 4(D) (excluding “or in the flare” and “or the flare” in both sections, which was previously disapproved in paragraphs (d)(1)(i)(B) and (C) above), 3(A)(1)(d) and 4(B) of Cenex Harvest State Cooperatives' exhibit A to the stipulation between the Montana Department of Environmental Quality and Cenex Harvest State Cooperatives, adopted June 12, 1998 by Board Order issued by the Montana Board of Environmental Review.

(2) Method #6A-1 of attachment #2 of Cenex Harvest State Cooperatives' exhibit A, as revised pursuant to the stipulation between the Montana Department of Environmental Quality and Cenex Harvest State Cooperatives, adopted by Board Order issued on March 17, 2000, by the Montana Board of Environmental Review.

(3) Sections 3(B)(2), 4(B), and 6(B)(3) of Exxon's exhibit A to the stipulation between the Montana Department of Environmental Quality and Exxon, adopted on June 12, 1998 by Board Order issued by the Montana Board of Environmental Review.

(4) Sections 2(A)(11)(d), 3(A)(1), 3(B)(1) and 4(C) of Exxon Mobil Corporation's exhibit A, as revised pursuant to the stipulation between the Montana Department of Environmental Quality and Exxon Mobil Corporation, adopted by Board Order issued on March 17, 2000, by the Montana Board of Environmental Review.

(f) Administrative Rules of Montana 17.8.335 of the State's rule entitled “Maintenance of Air Pollution Control Equipment for Existing Aluminum Plants,” submitted by the Governor on January 16, 2003, is disapproved. We cannot approve this rule into the SIP because it is inconsistent with the Act (e.g., sections 110(a) and 110(l)), prior rulemakings and our guidance.