Operational emissions would result primarily from:
m
natural gas-fired turbines
reciprocating engines
emergency generators
dehydrators
auxiliary heaters
m
located at the compressor stations.
These compressor stations would be used to compress natural gas for transportation through the pipeline.
Combustion emissions from these stations would mainly consist of:
NOx
CO
HAPs
Volatile Organic Compounds (VOCs)
SO2
PM10/PM2.5
GHGs which include:
N2O
CO2
CH4
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would also be produced from combustion sources at the compressor stations.
CH4 can be released from:
under routine operations
inspection
compressor station venting
meter station venting
pigging
under upset conditions
pipeline venting
blowdown events
In addition, CH4 emissions can occur
due to leaks from pipeline
and system components such as:
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equipment packing
seals
valves
flanges
pneumatic devices
connectors.
Dominion has committed to install various mitigation measures to reduce criteria pollutant and HAP emissions from the compressor stations.
SOURCE: Environmental Assessment for APPALACHIAN GATEWAY PROJECT
OEP/DG2E/Gas3, Dominion Transmission Inc
CP10-448-000, PF09-15-000, Federal Energy Regulatory Commission
Office of Energy Projects, Washington, DC, March 2011
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