MOJAQMD RULE 917 STD. FOR COAL PREPARATION PLANTS          
LAST REVISED 02/20/79

          
          (Adopted: February 20, 1979)

                                       Rule 917
                            Standards of Performance for
                               Coal Preparation Plants


          (a)  Applicability and Designation of Affected Facility

               The  provisions  of  this  rule are applicable to any of the
               following affected facilities  in  coal  preparation  plants
               which  process  more than 200 tons per day:  thermal dryers,
               pneumatic  coal-cleaning   equipment   (air   tables),  coal
               processing  and conveying equipment (including breakers  and
               crushers), coal  storage  systems,  and  coal  transfer  and
               loading systems.

          (b)  Definitions

               (1)  Coal  Preparation  Plant  means any facility (excluding
                    underground mining operations)  which  prepares coal by
                    one  or  more  of  the  following processes:  breaking,
                    crushing, screening, wet  or  dry cleaning, and thermal
                    drying.

               (2)  Bituminous Coal means solid fossil  fuel  classified as
                    bituminous coal by A.S.T.M. Designation D-388-66.

               (3)  Coal  means  all  solid  fossil  fuels  classified   as
                    anthracite,   bituminous,   or   lignite   by  A.S.T.M.
                    Designation D-388-66.

               (4)  Cyclonic  Flow  means  a spiraling movement of  exhaust
                    gases within a duct or stack.

               (5)  Thermal Dryer means any  facility in which the moisture
                    content of bituminous coal is reduced by contact with a
                    heated gas stream which is exhausted to the atmosphere.

               (6)  Pneumatic Coal-Cleaning Equipment  means  any  facility
                    which  classifies  bituminous coal by size or separates
                    bituminous  coal from  refuse  by  application  of  air
                    stream(s).

               (7)  Coal  Processing  and  Conveying  Equipment  means  any
                    machinery  used  to  reduce  the  size  of  coal  or to
                    separate  coal  from  refuse, and the equipment used to
                    convey  coal to or remove  coal  and  refuse  from  the
                    machinery.   This  includes,  but  is  not  limited to,
                    breakers, crushers, screens, and conveyor belts.

               (8)  Coal  Storage  System means any facility used to  store
                    coal except for open storage piles.

               (9)  Transfer and Loading  System means any facility used to
                    transfer and load coal for shipment.

          (c)  Emission Standard

               (1)  On and after the date on  which  the  performance  test
                    required   to   be   conducted  by  Rule  902(b)(1)  is
                    completed,  an  owner  or   operator   subject  to  the
                    provisions  of  this  subpart  shall  not cause  to  be
                    discharged into the atmosphere from any  thermal  dryer
                    gases which:

                    (A)  Contain  particulate  matter  in  excess  of 0.070
                         g/dscm (0.031 gr/dscf).

                    (B)  Exhibit 20 percent opacity or greater.

               (2)  On  and  after  the  date on which the performance test
                    required  to  be  conducted   by   Rule   902(b)(1)  is
                    completed,   an  owner  or  operator  subject  to   the
                    provisions of  this  subpart  shall  not  cause  to  be
                    discharged  into the atmosphere from any pneumatic coal
                    cleaning equipment, gases which:

                    (A)  Contain  particulate  matter  in  excess  of 0.040
                         g/dscm (0.018 gr/dscf).

                    (B)  Exhibit 10 percent opacity or greater.

               (3)  On  and  after  the  date on which the performance test
                    required  to  be  conducted   by   Rule   902(b)(1)  is
                    completed,   an  owner  or  operator  subject  to   the
                    provisions  of   this   rule  shall  not  cause  to  be
                    discharged into the atmosphere from any coal processing
                    and conveying equipment,  coal  storage system, or coal
                    transfer  and  loading  system processing  coal,  gases
                    which exhibit 20 percent opacity or greater.

          (d)  Monitoring

               (1)  The  owner  or  operator of  any  thermal  dryer  shall
                    install, calibrate,  maintain, and continuously operate
                    monitoring devices as follows:

                    (A)  A monitoring device  for  the  measurement  of the
                         temperature  of the gas stream at the exit of  the
                         thermal  dryer   on   a   continuous  basis.   The
                         monitoring  device  is  to  be  certified  by  the
                         manufacturer  to  be  accurate  within   +or=   30
                         Fahrenheit.
                    
                    (B)  For  affected facilities that use venturi scrubber
                         emission control equipment:

                         (i)  A   monitoring   device  for  the  continuous
                              measurement of the  pressure loss through the
                              venturi   construction    of    the   control
                              equipment.  The monitoring device  is  to  be
                              certified  by the manufacturer to be accurate
                              within +or- 1 inch water gage.

                         (ii) A  monitoring   device   for  the  continuous
                              measurement of the water supply  pressure  to
                              the control equipment.  The monitoring device
                              is  to be certified by the manufacturer to be
                              accurate  within  +or-  5  percent  of design
                              water  supply pressure.  The pressure  sensor
                              or tap must  be  located  close  to the water
                              discharge  point.  The Air Pollution  Control
                              Officer may  be  consulted  for  approval  of
                              alternative locations.

               (2)  All  monitoring  devices  under  paragraph  (1) of this
                    section  are  to be recalibrated annually in accordance
                    with procedures under 40 CFR 60.13 (B)(3).

          (e)  Testing Procedure

               Emissions shall be tested according to the methods specified
               by the Air Pollution Control Officer.

          (f)  Effective Date

               This rule is effective  upon the date that the United States
               Environmental  Protection   Agency  delegates  authority  to
               implement and enforce this rule  to  the  Mojave  Desert Air
               Quality Management District.