AQ_F_1300104_20150522_ST_RvwMemo

Cabarrus County
Division of Air Quality
May 22, 2015
MEMORANDUM
To: Ron Slack, Mooresville Regional Office
From: Gary L. Saunders, Stationary Source Compliance Branch (SSCB) �
Subject: Concord City Generating Plant#2
Concord, Cabarrus County,North Carolina
Facility ID 1300104, Permit No. 07645R06
Carbon Monoxide Testing Conducted on October 23-24, 2014 on Two Diesel-Fired
Generators (ID-4 and ID-5)
by Montrose Air Quality Services
Tracking No. 2014-018ST
The subject test report has been reviewed. The sources tested were two diesel-fired
engines/generators used for emergency and peak-shaving power generation at the facility. The
engines are a Caterpillar Model 3516 with a rated output of 2304 horsepower(hp) and an
electrical generator rated at 2,000 kW. These two generators were selected from the six identical
units to be representative of emissions. This testing was conducted consistent with EPA
guidelines for such testing of representative units.
The purpose of the testing was to demonstrate compliance with emission limits established by 40
CFR 63, Subpart ZZZZ (4Z),National Emission Standards for Hazardous Air Pollutants from
Reciprocating Internal Combustion Engines. The facility must control carbon monoxide (CO)
by at least 70% efficiency(inlet and outlet testing) or to 23 ppmvd for each engine. Testing was
conducted simultaneously at the inlet and outlet to demonstrate the reduction efficiency for each
unit. The results of each test are summarized below:
Table 1: Test Result Summary
Test Results
Source Standard Emission Outlet AP CO Compliance
Limit Concentration Across Reduction Indicated?
Catalyst Efficient
ID-4 70% CO 5.34 ppm 3.16 96.32%a Yes
740 CFR reduction
ID-5 63 (4Z) ppmvd
2,3d 5.53 ppm 3.09 96.15% Yes
Reduction efficiency results from simultaneous inlet and outlet testing concentrations in parts per million
by volume on a dry basis (ppmvd), corrected to 15%02. OP= inches H2O
40 CFR 63 Subpart 4Z requires an initial performance test to be conducted within 180 days of
the compliance date(for facilities granted an extension, May 3, 2014) for each engine subject to
the testing requirements. The engine/generator was tested at a nominal 73-74%of generator

Ron Slack, Mooresville Regional Office
May 22, 2015
Page 2
load. (1,579-1,587 kW). The inlet catalyst oxidation temperature and pressure drop across the
catalyst were measured for future compliance checks. The catalyst inlet temperature was within
the required temperature range of 450-1350°F for the engine. The pressure drop measured
during the test for each engine is listed in the table.
In summary, the test results are acceptable. If you have any questions,please contact me at (919)
707-8413 or [e-mail].
cc: Central Files, Cabarrus County
IBEAM Documents- 1300104