AQ_F_0400056_20160817_ST_STO-Rpt (4)

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NORTH CAROLINA DIVISION OF Fayetteville Regional Office
AIR QUALITY Piedmont Natural Gas-Wadesboro Compressor
Station
Stack Test Observation Report NC Facility ID 0400056
Date: 08/17/2016 County/FIPS:Anson/007
Facility Data Compliance Data
Piedmont Natural Gas-Wadesboro Compressor Station Observation Date 08/17/2016
259 Pleasant Grove Church Road Observer's Name Gregory Reeves
Wadesboro,NC 28170 Operating Status Operating
Lat: 35d 1.4834m Long: 80d 1.6830m Action Code
SIC: 4922/Natural Gas Transmission
NAICS: 48621 /Pipeline Transportation of Natural Gas
Contact Data Permit Data
Facility Contact Authorized Contact Technical Contact Permit 10097/TOl
Gil Vinzani Herb Jeans Gil Vinzani Issued 9/15/2014
Environmental Engineer Director of Technical Environmental Engineer Expires 8/31/2019
[phone] Field Operations [phone] Classification Title V
_ [phone] Permit Status Active
Inspector's Signature: Comments:
_ TRACKING NUMBER
Date of Signature: 47,611711Zolol ) l 2016-182ST
1. LOCATION:
Piedmont Natural Gas—Wadesboro Compressor Station,259 Pleasant Grove Church Road, Wadesboro,NC,
Anson County.
2. DIRECTIONS:
From FRO,take US Hwy 401 South through Raeford and Wagram. Just outside Wagram,turn right onto Old
Wire Road(NC 144). Follow Old Wire Road across US 151501 and through Laurel Hill to US 74. Turn right
onto US 74. Follow US 74 35 miles to Wadesboro,then turn right onto N. Greene St/NC Hwy 109. Drive 4.9
miles,then turn left onto Pleasant Grove Church Road. The Piedmont facility is located approximately 0.3
miles on the left side of the road.
3. SAFETY CONSIDERATIONS:
The usual FRO safety gear is required, including hard hat,safety shoes,safety glasses,and hearing protection.
There may be numerous pieces of equipment operating on site, including forklifts,personnel lifts,trucks, cars,
and other vehicles. At the time of this stack test,the facility was operating only one of the compressor engines,
ID No.COMPOI.

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Piedmont Natural Gas—Wadesboro Compressor Station
Stack Test Observation Report
Page 2 of 4
4. FACILITY DESCRIPTION:
The facility is a large natural gas pipeline compressor station. The facility accepts natural gas from the Transco
distribution pipeline at 500-800 psig pressure, and compresses this gas to 800-1,000 psig for injection back into
the pipeline to transport it to its destination. This facility was installed to be able to supply natural gas to the
Progress Energy Sutton electrical power station in Wilmington. The Piedmont facility consists of eight(8)
permitted natural gas-fired 4,735 HP compressors,plus a 770 HP natural gas-fired emergency generator. Only
four of the eight compressors have been installed to date. The facility is performing stack tests on the four
compressor engines to demonstrate compliance with NSPS Subpart JJJJ emission limits for the engines.
5. TEST CHRONOLOGY:
02/25/14 Stack testing commenced on the#1 compressor engine,ID No. COMPOL
06/28/16 RCO received the proposed stack testing protocol for the four compressor engines.
08/05/16 RCO approved the proposed stack testing protocol.
08/17/16 Testing of engines 1 and 2 was completed.
08/18/16 Testing of engines 3'and 4 was completed.
6. PURPOSE OF STACK TEST:
The purpose of this test is to demonstrate continued compliance for the four natural gas-fired compressor
engines (ID Nos. COMPOI through COMP04) as required under NSPS Subpart JJJJ. These engines are not
"certified" engines, and thus a stack test is required to demonstrate compliance with the NOx, CO, and VOC
emission limits under the NSPS regulation every 8,760 hours of operation or every 3 years, whichever comes
first.
The engines being tested are Caterpillar 4,735 HP four-stroke lean-burn natural gas-fired reciprocating internal
combustion engines. Each engine drives a natural gas compressor. Under NSPS Subpart JJJJ, the emission
limits for this engine are as follows: [40 CFR 60,Subpart JJJJ,Table 1]
Note that the owner or operator can choose to comply with either the emission limit in g/hp-hr OR the emission
limit in ppmvd% 15%02.
NOx 1.0 82
CO 2.0 270
VOC 0.7 60

Piedmont Natural Gas—Wadesboro Compressor Station
Stack Test Observation Report
Page 3 of 4
The approved test methods are as follows:
CO EPA Method 10 3 60 min
02 EPA Method 3A 3 60 min 1-3 No of sampling points is per M7E
NOx EPA Method 7E 3 60 min stratification test
VOC EPA Method 25A 3 60 min
Moisture EPA Method 4 3 60 min 1-3 For moisture calculations,correction
to dry standard
CH4 EPA Method 18 3 60 min 1-3 Correction of THC to report NMHC
THC—total hydrocarbon
NMHC—non-methane hydrocarbon
Testing is to be conducted at full load+ 10%. Proposed testing rate was 4,735 HP.
7. STACK TEST OBSERVATIONS:
On Wednesday August 17, 2016, I, Greg Reeves of the Fayetteville Regional Office, arrived at the Piedmont
Natural Gas—Wadesboro Compressor Station site at approximately 8:00 AM to observe stack testing of the 4
compressor engines. Testing this date was to be on#1 and#2 engines(ID Nos. COMP01 and COMP02),with
the testing of #3 and #4 engines (ID Nos. COMP03 and COMP04) to be conducted the following day on
08/18/16. I met with Gil Vinzani, Environmental Engineer (919-899-6081 office, 919-623-5701 cell), Alan
Henderson, Manager, Compression and Controls (910-419-7207 office, 910-334-9035 cell), and Tony Jabon,
consultant with Trinity Consultants in Charlotte, NC (704-553-4474 office, 214-274-7980 cell). Air-Tech
Environmental, LLC was performing the source test for Piedmont. The technician for Au-Tech was Darrel
Doerle(919-302-6627 office, 919-544-6338 cell).
The first test run for the#1 engine commenced at approximately 7:58 AM. The facility process controls
indicated that the engine load was varying slightly between approximately 96 and 98%of full load. The first
run test was completed at approximately 8:59 AM. No problems were noted during this test run.
The second test run for the#1 engine commenced at approximately 9:08 AM and concluded at approximately
10:09 AM. No problems were noted during this test run. Engine load varied between 96 and 98%of full load
during this test run.
The third test run for the 41 engine commenced at approximately 10:20 AM. Engine load at the beginning of
this test run was 98%of full load. The facility was in process of startup of the#2 engine when I left the facility.
I did not remain at the facility to observe the end of the third test run.
I departed the facility at approximately 11:00 AM.
Testing was to continue today to complete the third test run for the#1 engine,and was to continue into the
afternoon with 3 test runs scheduled for the#2 engine. Testing for engines#3 and#4 was scheduled for
Thursday 08/18/16.

Piedmont Natural Gas-Wadesboro Compressor Station
Stack Test Observation Report
Page 4 of 4
Hours of operation of engines since the previous initial performance tests are as follows:
#1 4,047
#2 4,198
#3 4,132
#4 4,193
Preliminary results for the first two test runs for the#1 engine(ID No. COMPOI)were as follows:
Oz 11.8% 11.4%
CO2 4.7% 5.0%
CO 5.4 ppm 5.2 ppin
THC 2,388 ppm 2,352 ppm
NOx 32.9 ppra 32.4 ppin
Methane 2,305 ppm 2,311 ppm
NMHC 83 ppm 41 ppm
- 8. COMPLIANCE STATEMENT:
It appeared that the stack testing during the first and second test runs for engine#1 was conducted in accordance
with the requirements of the EPA methods specified. Field results on the analysis of the stack gases and
preliminary emission calculations based on field measurements of power generation would appear to indicate
compliance with the emission limits set forth in NSPS Subpart JJJJ. However,these were only preliminary
field calculations. Final results will be submitted by the company.
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cc: FRO Facility Files