Sec. 7.
(a) The
following definitions apply throughout this section:
(1) "Annual throughput" means the amount of
material that is being processed through the plant on a calendar year
basis.
(2) "Sand and gravel" means
any unconsolidated mixture of fine or coarse aggregate, or both, found in and
processed from a natural deposit.
(3) "Surfactant" means any chemical additive
that reduces the surface tension of water.
(4) "Wet process in a pit and quarry
operation" means the operation in which the aggregate deposit being processed
has:
(A) been mined from beneath bodies of
water, such as:
(i) rivers;
(ii) estuaries;
(iii) lakes; or
(iv) oceans; or
(B) a free moisture content of one and
five-tenths percent (1.5%) by weight or greater.
The aggregate infeed that undergoes such process shall
maintain a minimum of one and five-tenths percent (1.5%) by weight throughout
the production process.
(5) "Wet suppression systems" means dust
control devices in a pit and quarry operation that use a pressurized liquid,
either water or water with a small amount of surfactant, for the controlled
reduction or elimination of airborne dust or the suppression of such dust at
its source.
(b) Any sand
and gravel plant may elect to be subject to this section by complying with the
requirements of section 1 of this rule and meeting the following conditions,
outlined under subdivisions (1) through (4), as applicable, and subdivision
(5):
(1) Sand and gravel plants that do not
emit particulate matter in excess of or equal to twenty-five (25) tons per
year, including fugitive particulate emissions, utilizing at most five (5)
crushers, ten (10) screens, and a conveying operation shall limit the annual
throughput to less than four hundred ten thousand (410,000) tons per
year.
(2) Sand and gravel plants
that do not emit particulate matter in excess of or equal to twenty-five (25)
tons per year, excluding fugitive particulate emissions utilizing at most nine
(9) crushers, twenty (20) screens, and a conveying operation shall limit the
annual throughput to less than one million (1,000,000) tons per year.
(3) Sand and gravel plants that do not emit
particulate matter in excess of or equal to one hundred (100) tons per year,
excluding fugitive particulate emissions, utilizing at most twelve (12)
crushers, twenty-four (24) screens, and a conveying operation shall limit the
annual throughput to less than three million one hundred thousand (3,100,000)
tons per year.
(4) Sand and gravel
plants that meet the specific restrictions and conditions in subdivision (1),
(2), or (3) shall also comply with the following provisions:
(A) Each source described by subdivisions (1)
and (2) shall maintain annual throughput records at the site on a calendar year
basis.
(B) Each source described by
subdivision (3) shall maintain at the site throughput records for the previous
twelve (12) months on a monthly rolling total.
(C) A wet process or continuous wet
suppressions shall be used.
(D) All
manufacturing equipment that generates particulate emissions and control
devices shall be operated and maintained at all times of plant operation in
such a manner as to meet the requirements of this rule.
(E) Visible emissions from the screening and
conveying operations shall not exceed an average of ten percent (10%) opacity
in twenty-four (24) consecutive readings in a six (6) minute period, and
visible emissions from the crushing operation shall not exceed an average of
fifteen percent (15%) opacity in twenty-four (24) consecutive readings in a six
(6) minute period. Compliance with these limitations shall be determined by 40
CFR 60, Appendix A, Method 9*.
(F)
Fugitive particulate emissions shall be controlled by applying water on storage
piles and unpaved roadways on an as needed basis, such that the following
visible emission conditions are met:
(i)
Visible emissions from storage piles shall not exceed twenty percent (20%) in
twenty-four (24) consecutive readings in a six (6) minute period. This
limitation shall not apply during periods when application of control measures
are ineffective or unreasonable due to sustained high wind speeds. The opacity
shall be determined using 40 CFR 60, Appendix A, Method 9*, except that the
opacity shall be observed at approximately four (4) feet from the surface at
the point of maximum opacity. The observer shall stand at least fifteen (15)
feet, but not more than one-fourth (1/4) mile, from the plume and at
approximately right angles to the plume.
(ii) Visible emissions from unpaved roadways
shall not exceed an average instantaneous opacity of twenty percent (20%).
Average instantaneous opacity shall be the average of twelve (12) instantaneous
opacity readings, taken for four (4) vehicle passes, consisting of three (3)
opacity readings for each vehicle pass. The three (3) opacity readings for each
vehicle pass shall be taken as follows:
(AA)
The first shall be taken at the time of emission generation.
(BB) The second shall be taken five (5)
seconds after the first.
(CC) The
third shall be taken five (5) seconds after the second or ten (10) seconds
after the first. The three (3) readings shall be taken at approximately four
(4) feet from the surface at the point of maximum opacity. The observer shall
stand at least fifteen (15) feet, but not more than one-fourth (1/4) mile, from
the plume and at approximately right angles to the plume.
(G) Fugitive particulate emissions
at a sand and gravel plant shall not escape beyond the property line or
boundaries of the property, right-of-way, or easement on which the source is
located pursuant to 326 IAC 6-4.
(H) The source shall comply with 40 CFR
60.670, Standards of Performance for Nonmetallic Mineral Processing Plants*, if
applicable.
(5) Request
a source specific operating agreement under this section.
*These documents are incorporated by reference. Copies may be
obtained from the Government Printing Office, 732 North Capitol Street NW,
Washington, D.C. 20401 or are available for review and copying at the Indiana
Department of Environmental Management, Office of Air Quality, Indiana
Government Center North, Tenth Floor, 100 North Senate Avenue, Indianapolis,
Indiana 46204.