NCUAQMD RULE 5-6-690 ACID RAIN UNITS SUBJ TO TITLE IV          
LAST REVISED 11/11/11
          
          
          RULE 690 - ACID RAIN UNITS SUBJECT TO TITLE IV

          The permit for an acid rain unit shall include conditions that
          require compliance with any federal standard or requirement
          promulgated pursuant to Title IV (Acid Deposition Control) of the
          Clean Air Act and any federal standard or requirement promulgated
          pursuant to Title V of the Clean Air Act, except as modified by
          Title IV.  Acid rain unit permit conditions shall include the
          requirements of 40 CFR Part 72.9 and the following provisions:

          (a) The sulfur dioxide emissions from an acid rain unit shall
              not exceed the annual emissions allowances (up to one ton 
              per year of sulfur dioxide may be emitted for each emission
              allowance allotted) that the source lawfully holds for that
              unit under Title IV of the Clean Air Act or the regulations
              promulgated pursuant to Title IV;

          (b) Any increase in an acid rain unit's sulfur dioxide emissions
              authorized by allowances acquired pursuant to Title IV of 
              the Clean Air Act shall not require a revision of the acid 
              rain portion of the operating permit provided such increases 
              do not require permit revision under any other applicable 
              federal requirement;

          (c) Although there is no limit on the number of sulfur dioxide
              emissions allowances held by a source, a source with an acid
              rain unit shall not use these emissions allowances as a
              defense for noncompliance with any applicable federal
              requirement or District requirement, including Regulation 1,
              Rule 220; and

          (d) An acid rain unit's sulfur dioxide allowances shall be
              accounted for according to the procedures established in
              regulations promulgated pursuant to Title IV of the Clean 
              Air Act.

                                       [Reference: 40 CFR 70.6(a)(4)]