# E C 

# / R Incorporated Providing Environmental Technical Support Since 1989

501 Eastowne Drive, Suite 25 0  Chapel Hill, North Carolina 2751 4 Telephone: (919)484

- 0222  Fax: (919) 484

- 0122 MEMORANDUM

Date: May 28, 2010

Subject: Site visit report for the Transco Compressor Station in Reidsville , N.C.

From: Robert Vogt, EC/R Incorporated

Phil Norwood, EC/R Incorporated

To: Bruce Moore, EPA/OAQPS/SPPD/CCG

I. INTRODUCTION

The purpose of t his memorandum is to summarize the Environmental Protection Agency (EPA) site visit to the Transcontinental Gas Pipeline Company L.L.C. (Transco) compressor station in Reidsville , North Carolina.

II. LOCATION AND DATE

Williams Gas Pipeline

– Transco Sta tion 160 Reidsville, North Carolina

February 2 3 , 2010

III. ATTENDEES

Williams Companies, Incorporated /T ransco

Mark G. Bisett
Michael Callegari

Rich Lutz
Jim McCarthy

Walter Romine
Mary Beth Whitfield

U.S. Environmental Protection Agency (EPA)

Rachel A gnew

Jodi Howard

Alex MacPherson

Bruce Moore

Nick Parsons

David SalmanEC/R Incorporated

Heather Brown

Phil Norwood
Robert Vogt

IV. OVERVIEW OF SITE VISIT The purpose of this visit was to gather information about the Transco facility and its

processes, with a focus on the air emissions and equipment, practices and controls that reduce these emissions. Prior to the visit, EPA mailed Transco a letter 1 which included an outline of

information of interest for the site visit.

Upon arrival, a brief meeting w as held in the on

- site offices. Following introductions and a brief safety orientation, Mr. Moore provided a summary of the purpose of the visit. This was followed by a tour of the facility. During this tour, p hotographs were taken of facility equipmen t . These photographs are included a s Attachment 1

.

V. SITE AND PROCESSES Transco is a wholly owned subsidiary of Williams Companies, Inc orporated

. Transco Station 160 serves the Transcontinental Gas Pipeline, which originates in the Southern Texas and

G ulf of Mexico region s and delivers natural gas to major downstream markets in the Mid

Atlant ic, Atlanta, and New York City. The Transco Station 160 facility was first constructed in 1950, and the first seven compressor engines were installed in December 1 951. Since original

construction

, eight additional internal combustion engines were installed at the facility, and one natural gas

- fired dry low NO

x combustion turbine was installed in May 2003. The existing station consists of 15 engines totaling 55,100 horsepower. Size and horsepower of this facility is typical of a modern mainline compressor station. Transco participates in the EPA’s Natural Gas Star Program.

V I

. EMISSION SOURCES, PERMITS, AND REGULATIONS

Air pollutants generated by this facility in clude PM, NO

x , VOC, CO, SO 2 , and HAPs.

Detailed emissions data and permit conditions for this facility can be found in the attached North Carolina Department of Environment and Natural Resources ( NCDE N R ) Air Quality Permit ( see Attachment 2)

, December 20 09 Inspection Report (see Attachment 3) , and Station 160 Emissions Report (see Attachment 4) . The permitted emission sources include the internal combustion (IC) engines and the turbine.

All of the lean

- fired combustion engine s at the facility are subje ct to the requirements

under 40 CFR 6 3

, Subpart ZZZZ

, National Emissions Standards For Hazardous Air Pollutants For Stationary Reciprocating Internal Combustion Engines (RICE), or the “RICE Maximum Achievable Control Technology (MACT) Standard.” Additionally, the natural gas

- fired combustion turbine at the facility is subject to the requirements under 40 CFR 60, Subpart GG,

Standards Of Performance For Stationary Gas Turbines , or the Turbine New Source Performance Standards (NSPS); and requ irements of 40 CFR 63, subpart YYYY, National

1 Letter from Hustvedt, Kent C., Coatings and Chemicals Group, Office of Air Quality Planning an d Standards, United States Environmental Protection Agency, Research Triangle Park, NC, to Romine, Walter, Transcontinental Gas Pipe Line Company, LLC . Confirmation of Site Visit. February 17, 2010.Emission Standards For Hazardous Air Pollutants For Stat ionary Combustion Turbines , or the

Turbine MACT.

In addition, natural gas blowdown operations is a listed emission source on the permit (ES

- BDO). At this facility, pipeline blowdowns are scheduled for system maintenance, and a

40 tons per year Preventio n of Significant Deterioration ( PSD ) avoidance limit is maintained. Pipeline pigging operations are performed every 7

- 10 years for cleaning and pipeline integrity inspections.

Insignificant and unpermitted emissions sources at this facility are also docu mented in the permit

. Those sources include hydraulic oil tanks, air compressor coolant tanks, surge tanks, natural gas condensate tanks, and ethylene/glycol water tanks.

Note: Following the visit, Mr. Lutz confirmed that there was no information discuss ed during

the visit that Williams/Transco considered confidential business information (CBI). A copy of this email confirmation is included as Attachment 5

.