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PUBLIC NOTICE LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY (LDEQ)

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PUBLIC NOTICE
LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY (LDEQ) FORMTEXT CENTERPOINT ENERGY - MISSISSIPPI RIVER TRANSMISSION CORP UNIONVILLE STORAGE COMPRESSOR STATION PROPOSED FORMTEXT PART 70 AIR OPERATING PERMIT RENEWAL/MODIFICATION
The LDEQ, Office of Environmental Services, is accepting written comments on FORMTEXT the proposed Part 70 air operating permit renewal/modification for FORMTEXT Centerpoint Energy - Mississippi River Transmission Corp, FORMTEXT P.O. Box 21734, Shreveport, LA 71151-0001 for the FORMTEXT Unionville Storage Compressor Station. The facility is located FORMTEXT approximately 14 miles North of Ruston in Dubach, Lincoln Parish.
FORMTEXT Centerpoint Energy - Mississippi River Transmission Corp CenterPoint Energy - Mississippi River Transmission Corporation (MRT) owns and operates the Unionville Storage Compressor Station located in Lincoln Parish. A permit application and Emission Inventory Questionnaire were submitted by CenterPoint Energy - Mississippi River Transmission Corp on June 9, 2009, in which they requested FORMTEXT a renewal and modification of the Part 70 Operating Permit, for the Unionville Storage Compressor Station. Additional information dated March 18, 2010 and February 22, 2011, was also received. On July 14 and 23, 2010, CenterPoint Energy requested that the permit application be considered a renewal application for the Part 70 Air Operating Permit. The application was deemed administratively complete in accordance with LAC 33:III.519.A on July 23, 2010.
Unionville Storage Compressor Station receives natural gas from nearby pipelines and injects it into underground reservoirs. When needed, gas is withdrawn from storage and transported offsite via pipelines. Four process heaters are used to prevent gas from freezing, and five glycol dehydration units are employed to remove water in the gas stream. Emissions from each still column vent are controlled through the use of a thermal oxidizer (1-02). Approximately 30 billion cubic feet of natural gas are handled annually.
In addition there are three Dresser Clark TCV-16 compressor engines (1-69, 2-69, and 1-74), one Cooper Bessemer GMVH-10C2 compressor engine (1-95), and one Caterpillar G3516TALE compressor engine (3-07). These units serve as both the mainline compression and storage injection/withdrawal equipment. A 1,340 hp Caterpillar 3516 emergency use generator engine (1-07) equipped with a catalytic converter is also located at the facility.
In this modification Centerpoint Energy proposed to:
1) add CAM requirements to the thermal oxidizer. LDEQ has determined that CAM is not applicable to the dehydration units because the dehydration units are subject to a NESHAP proposed after November 15, 1990. The facility included a CAM plan for the five dehydration units EPNs 4-74B, 5-74B, 4-07B, 1-08B, 2-08B and the thermal oxidizer EPN 1-02. However, LDEQ has not included the CAM plan as part of this permit, as there are federally enforceable requirements on the dehydration units and/or thermal oxidizer that contain sufficient monitoring, recordkeeping, and reporting requirements to ensure proper operation and maintenance of the equipment.
2) increase the emissions for the thermal oxidizer because a larger pump was installed on the No. 5 Dehydration Unit.
Estimated emissions in tons per year are as follows:

INSERT CHART 1

*Includes 28.35 TPY of hazardous air pollutants and 11.13 TPY of LAC 33:III. Chapter 51 toxic air pollutants.
A technical review of the working draft of the proposed permit was submitted to the facility representative and the LDEQ Inspection Division. Any remarks received during the technical review will be addressed in the “Worksheet for Technical Review of Working Draft of Proposed Permit”. All remarks received by LDEQ are included in the record that is available for public review.
Written comments, written requests for a public hearing or written requests for notification of the final decision regarding this permit action may be submitted to LDEQ, Public Participation Group, P.O. Box 4313, Baton Rouge, LA 70821-4313. Written comments and/or written requests must be received by 12:30 p.m., Thursday, June 2, 2011. Written comments will be considered prior to a final permit decision.
Information forwarded by email should follow the statewide email policies. Attachments included with emails may be blocked due to restrictions on file size or type. For details check the following link, http://doa.louisiana.gov/ocs/email/policies.htm.
If LDEQ finds a significant degree of public interest, a public hearing will be held. LDEQ will send notification of the final permit decision to the applicant and to each person who has submitted written comments or a written request for notification of the final decision.
The FORMTEXT application, proposed part 70 air operating permit, and statement of basis FORMDROPDOWN available for review at the LDEQ, Public Records Center, Room 127, 602 North 5th Street, Baton Rouge, LA. Viewing hours are from 8:00 a.m. to 4:30 p.m., Monday through Friday (except holidays). The available information can also be accessed electronically on the Electronic Document Management System (EDMS) on the DEQ public website at www.deq.louisiana.gov.
Additional copies may be reviewed at Lincoln Parish Library – Headquarters, 910 N Trenton St., Ruston, LA 71270.
Inquiries or requests for additional information regarding this permit action should be directed to FORMTEXT Ms. Cathy E. Wilson, LDEQ, Air Permits Division, P.O. Box 4313, Baton Rouge, LA 70821-4313, phone (225) 219- FORMTEXT 3585.
Persons wishing to be included on the LDEQ permit public notice mailing list or for other public participation related questions should contact the Public Participation Group in writing at LDEQ, P.O. Box 4313, Baton Rouge, LA 70821-4313, by email at DEQ.PUBLICNOTICES@LA.GOV or contact the LDEQ Customer Service Center at (225) 219-LDEQ (219-5337).
Permit public notices including electronic access to the proposed permit and statement of basis can be viewed at the LDEQ permits public notice webpage at www.deq.louisiana.gov/apps/pubNotice/default.asp and general information related to the public participation in permitting activities can be viewed at www.deq.louisiana.gov/portal/tabid/2198/Default.aspx.
Alternatively, individuals may elect to receive the permit public notices via email by subscribing to the LDEQ permits public notice List Server at http://www.doa.louisiana.gov/oes/listservpage/ldeq_pn_listserv.asp.
All correspondence should specify AI Number FORMTEXT 13145, Permit Number FORMTEXT 1720-00014-V5, and Activity Number PER FORMTEXT 20100001.
form_7118_r02 08/16/10
1td: April 28, 2011

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