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.