SDAPCD RULE X-D STDS.OF PERF.FOR FOSSIL-FUEL FIRED STM.GEN.          
LAST REVISED 11/11/11

          
          SUBPART D - Standards of Performance for Fossil Fuel-Fired
                      Steam Generators   (Delegation Effective 11-8-76)


               RULE 260.40.   APPLICABILITY AND DESIGNATION OF AFFECTED
                              FACILITY  (Rev. Effective 8-7-80)

               (a)  The provisions of this subpart are applicable to each
          fossil fuel-fired and/or fossil fuel and wood residue-fired steam
          generating unit capable of firing fossil fuel at a heat input
          rate of more than 63 million kcal (250 million Btu per hour).
          Any change to an existing fossil fuel-fired steam generating unit
          to accommodate the use of combustible materials, other than
          fossil fuels as defined in this subpart, shall not bring that
          unit under the applicability of this subpart.

               (b)  Except as provided in Section (c) of this rule, any
          facility under Section (a) of this rule that commenced construct
          ion or modification after August 17, 1971, is subject to the
          requirements of this subpart.

               (c)  The requirements of Rule 260.44(a)(4), (a)(5), (b), and
          (d) are applicable to lignite-fired steam generating units that
          commenced construction or modification after December 22, 1976.

               (d)  Any facility covered under Subpart Da is not covered
          under this subpart.


               RULE 260.41.   DEFINITIONS   (Rev. Effective 9-17-77)

               As used in this subpart, all terms not defined herein shall
          have the meaning given them in Subpart A of this regulation.

               (a)  "Fossil Fuel-Fired Steam Generating Unit" means a
          furnace or boiler used in the process of burning fossil fuel for
          the purpose of producing steam by heat transfer.

               (b)  "Fossil Fuel" means natural gas, petroleum, coal, and
          any form of solid, liquid, or gaseous fuel derived from such
          materials for the purpose of creating useful heat.

               (c)  "Coal Refuse" means waste-products of coal mining,
          cleaning, and coal preparation operations (e.g., culm, gob, etc.)
          containing coal, matrix material, clay, and other organic and
          inorganic material.

               (d)  "Fossil Fuel and Wood Residue-Fired Steam Generating
          Unit" means a furnace or boiler used in the process of burning
          fossil fuel and wood residue for the purpose of producing steam
          by heat transfer.

               (e)  "Wood Residue" means bark, sawdust, slabs, chips,
          shavings, mill trim and other wood products derived from wood
          processing and forest management operations.  (Effective 9-17-77)

               (f)  "Coal" means all solid fuels classified as anthracite,
          bituminous, subbituminous, or lignite by the American Society for
          Testing Material.  Designation D 388-66.


               RULE 260.42.    STANDARD FOR PARTICULATE MATTER
                               (Rev. Effect. 6-16-78)

               (a)  On and after the date on which the performance tests
          required to be conducted by Rule 260.8 is completed, no owner or
          operator subject to the provisions of this subpart shall cause to
          be discharged into the atmosphere from any affected facility any
          gases which:

                    (1)  Contain particulate matter in excess of 0.18 g per
               million cal heat input (0.10 lb per million Btu) derived
               from fossil fuel or fossil fuel and wood residue.
               (Effective 9-17-77)

                    (2)  Exhibit greater than a 20 percent opacity except
               one six-minute period per hour of not more than 27 percent
               opacity.  (Effective 6-16-78)


               RULE 260.43.    STANDARD FOR SULFUR DIOXIDE

               (a)  On and after the date on which the performance test
          required to be conducted by Rule 260.8 is completed, no owner or
          operator subject to the provisions of this subpart shall cause to
          be discharged into the atmosphere from any affected facility any
          gases which contain sulfur dioxide in excess of:

                    (1)  1.4 g per million cal heat input (0.80 lb per
               million Btu) derived from liquid fossil fuel or liquid
               fossil fuel and wood residue.

                    (2)  2.2 g per million cal heat input (1.2 lb per
               million Btu) derived from solid fossil fuel or solid fossil
               fuel and wood residue.

               (b)  When different fossil fuels are burned simultaneously
          in any combination, the applicable standard shall be determined
          by proration using the following formula:

                                   y(1.4) + z(2.2)
                                   ---------------
                                        y + z
               where:

               y    is the percentage of total heat input derived from
                    liquid fossil fuel, and

               z    is the percentage of total heat input derived from
                    solid fossil fuel.

               (c)  Compliance shall be based on the total heat input from
          all fossil fuels burned, including gaseous fuels.


               RULE 260.44.   STANDARD FOR NITROGEN OXIDES
                              (Rev. Effective 1-12-79)

               (a)  On and after the date on which the performance test
          required to be conducted by Rule 260.8 is completed, no owner or
          operator subject to the provisions of this subpart shall cause to
          be discharged into the atmosphere from any affected facility any
          gases which contain nitrogen oxides, expressed as NO2 in excess
          of:

                    (1)  86 nanograms per joule heat input (0.20 lb per
               million Btu) derived from gaseous fossil fuel or gaseous
               fossil fuel and wood residue.

                    (2)  130 nanograms per joule heat input (0.30 lbs per
               million Btu) derived from liquid fossil fuel or liquid
               fossil fuel and wood residue.

                    (3)  300 nanograms per joule heat input (0.70 lb per
               million Btu) derived from solid fossil fuel or solid fossil
               fuel and wood residue (except lignite or a solid fossil fuel
               containing 25 percent, by weight, or more of coal refuse).

                    (4)  260 nanograms per joule heat input (0.60 lb per
               million Btu) derived from lignite or lignite and wood
               residue (except as provided under Subsection (a)(5) of this
               rule).

                    (5)  340 nanograms per joule heat input (0.80 lb per
               million Btu) derived from lignite which is mined in North
               Dakota, South Dakota, or Montana and which is burned in a
               cyclone-fired unit.

               (b)  Except as provided in sections (c) and (d) of this
          rule, when different fossil fuels are burned simultaneously in
          any combination, the applicable standard (in ng/J) shall be
          determined by proration using the following formula:

                         w(260)  +  x(86)  +  y(130)  +  z(300)
                         --------------------------------------
                                   w  +  x  +  y  +  z
               
               where:

               w    is the percentage of total heat input derived from
                    lignite,

               x    is the percentage of total heat input derived from
                    gaseous fossil fuel,

               y    is the percentage of total heat input derived from
                    liquid fossil fuel, and

               z    is the percentage of total heat input derived from
                    solid fossil fuel (except lignite).

               (c)  When fossil fuel containing at least 25 percent, by
          weight, of coal refuse is burned in combination with gaseous,
          liquid or other solid fossil fuel or wood residue, the standard
          for nitrogen oxides does not apply.

               (d)  Cyclone-fired units which burn fuels containing at
          least 25 percent of lignite that is mined in North Dakota, South
          Dakota, or Montana remain subject to Subsection (a)(5) of this
          rule regardless of the types of fuel combusted in combination
          with that lignite.


               RULE 260.45.    EMISSION AND FUEL MONITORING

               Monitoring requirements shall be those specified in Part 60,
          Chapter I, Title 40, Code of Federal Regulations, Section 60.45.


               RULE 260.46.    TEST METHODS AND PROCEDURES

               Performance tests shall be conducted as specified in Part
          60, Chapter I, Title 40, Code of Federal Regulations, Section
          60.46.