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Proposed Air Quality Permit 6886-SC-R1 – Source Category Permit to Construct and Operate Crushers, Screens, and Conveyors

Friday, March 1, 2019


Proposed Air Quality Permit 6886-SC-R1 – Source Category Permit to Construct and Operate Temporary Portable Crushers, Screens, and Conveyors in the District of Columbia

Notice is hereby given that, pursuant to 20 DCMR §210, the Air Quality Division (AQD) of the Department of Energy and Environment (DOEE), located at 1200 First Street NE, 5th Floor, Washington, DC, intends to issue a source category permit covering a subset of temporary portable crusher/screen/conveyor operations in the District of Columbia.  This source category permit will be designated Permit No. 6886-SC-R1.

This source category permit will cover only portable crushers, screens, and conveyors processing nonmetallic minerals only, that will be in operation at a given site for no more than six months. This permit covers only units that are controlled with wet suppression (i.e. water spray) and that will operate for less than twelve hours per day. Engines associated with the equipment are required to operate using only gasoline or ultra-low sulfur diesel fuel.

The proposed overall emission limits for the equipment are as follows:

  1. Emissions of dust shall be minimized in accordance with the requirements of 20 DCMR 605 and the “Operational Limitations” of the permit.
  2. The emission of fugitive dust from any material handling, screening, crushing, grinding, conveying, mixing, or other industrial-type operation or process is prohibited. [20 DCMR 605.2]

c.   Emissions from the engine powering the crusher/screen shall not exceed those achieved by proper operation of the equipment in accordance with manufacturer’s specifications.

d.   Visible emissions shall not be emitted into the outdoor atmosphere from stationary sources; provided, that the discharges not exceeding forty percent (40%) opacity (unaveraged) shall be permitted for two (2) minutes in any sixty (60) minute period and for an aggregate of twelve (12) minutes in any twenty-four hour (24 hr.) period during start-up, cleaning, soot blowing, adjustment of combustion controls, or malfunction of the equipment. [20 DCMR 606.1]

e.   In addition to Condition (d), emissions from grinding mills, screening operations, bucket elevators, transfer points on belt conveyors, bagging operations, storage bins, enclosed truck or railcar loading stations shall not exceed 7% opacity. Emissions from crushers shall not exceed 12% opacity. [40 CFR 60, Subpart OOO, Table 3]

f.    An emission into the atmosphere of odorous or other air pollutants from any source in any quantity and of any characteristic, and duration which is, or is likely to be injurious to the public health or welfare, or which interferes with the reasonable enjoyment of life or property is prohibited. [20 DCMR 903.1]

g.   Emissions of PM10 from all sources at the site shall not exceed 25 tons during the duration of operations of the unit at the site.

h.   Emissions of NOx from all sources at the site shall not exceed 25 tons during the duration of operations of the unit at the site.

As a worst case, emissions from each unit are not expected to exceed the following:


Maximum Annual Emissions



Particulate Matter (PM10)


Carbon Monoxide (CO)


Oxides of Nitrogen (NOx)


Volatile Organic Compounds (VOC)


Sulfur Oxides (SOx)


The permit application and supporting documentation, along with the draft permit are available for public inspection at AQD and copies may be made available between the hours of 8:15 A.M. and 4:45 P.M. Monday through Friday. Interested parties wishing to view these documents should provide their names, addresses, telephone numbers and affiliation, if any, to Stephen S. Ours at (202) 535-1747.

Interested persons may submit written comments or may request a hearing on this subject within 30 days of publication of this notice. The written comments must also include the person’s name, telephone number, affiliation, if any, mailing address and a statement outlining the air quality issues in dispute and any facts underscoring those air quality issues. All relevant comments will be considered in issuing the final permit.

Comments on the proposed permit and any request for a public hearing should be addressed to:


Stephen S. Ours   
Chief, Permitting Branch - Air Quality Division

 Department of Energy and Environment
1200 First Street NE, 5th Floor

Washington DC 20002

[email protected]

No comments or hearing requests submitted after April 1, 2019 will be accepted.


For more information, please contact Stephen S. Ours at (202) 535-1747.