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Proposed Air Quality Permits - Three Existing 600 kW Emergency Generator Sets at the McMillan Water Treatment Plant


Notice is hereby given that, pursuant to 40 C.F.R. Part 51.161, and D.C. Official Code §2-505, the Air Quality Division (AQD) of the District Department of the Environment (DDOE), located at 1200 First Street NE, 5th Floor, Washington, DC, intends to issue air quality permits (#6261-R1, #6262-R1, and #6263-R1) to Washington Aqueduct, U.S. Army Corps of Engineers, Baltimore District, to operate the listed diesel-fired emergency generator engines located at the McMillan Reservoir in Washington, DC. The contact person for the facility is Shabir Choudhary, Section Supervisor, at (202) 764-2771.

Emergency Generators to be Permitted

Equipment Location 


Equipment Size

Model Number

Serial Number

Permit Number

McMillan WTP

2500 1st  St. NW Washington, DC 20001

600 kW (1135hp)

KTA38-G1 Cummins



McMillan WTP

2500 1st  St. NW Washington, DC 20001

600 kW (1135hp)

KTA38-G1 Cummins



McMillan WTP

2500 1st  St. NW Washington, DC 20001

600 kW (1135hp)

KTA38-G1 Cummins



The proposed emission limits are as follows:

a.     Visible emissions shall not be emitted into the outdoor atmosphere from the generators, except that 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, adjustment of combustion controls, or malfunction of the equipment [20 DCMR 606.1]

 b.     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]

The estimated emissions from the units are as follows:

For the three (3) identical McMillan Water Treatment Plant Generators:


Emission Rate (each generator) (lb/hr)

Maximum Annual Emissions (each generator) (tons/yr)

Total Particulate Matter, PM (Total)



Sulfur Oxides (SOx)



Nitrogen Oxides (NOx)



Volatile Organic Compounds (VOCs)



Carbon Monoxide (CO)



The applications to operate the generators and the draft renewal permits 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

District Department of the Environment
1200 First Street NE, 5th Floor
Washington, DC 20002

[email protected]

No written comments or hearing requests postmarked after June 17, 2013 will be accepted.

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