Composite Training Unit Exercises and Joint Task ... - Govsupport.us

COMPTUEX/JTFEX EA/OEA Final Chapter 4CAA General Conformity analysis is not conducted for actions outside the territorial watersof the United States.Individual operations may include participation by aircraft, surface ships, submarines, and ordnance use.Each of these constitutes a potential source of air emissions. The approach used to characterize emissionsfrom each of the emission source categories is summarized below.4.1.1 Aircraft OperationsThe methodology for estimating aircraft emissions involves evaluating the type of operations for eachtype of aircraft, the number of hours of operation for each aircraft type, the type of engine in each aircraft,and the mode of operation for each type of aircraft. Emissions occurring above 3,000 feet would be to beabove the atmospheric inversion layer and therefore would not impact the local air quality. Aircraftflights originate from onshore air stations and are counted in that installation’s aircraft operations. It wasassumed that all aircraft would be traveling from their home base to the exercise locations at an elevationabove 3,000 feet, and that transits to the range would therefore not affect the local onshore air quality.Time on range for the COMPTUEX/JTFEX was estimated based on the individual operational scenariosand participants in each operation. Estimated altitudes of operations for all aircraft were obtained fromdescriptions of the operational scenarios based on training requirements. Helicopters, including theSH-60, CH-46, CH-53, and UH-1, were assumed to operate below 3,000 feet elevation during their timeparticipating in the COMPTUEX/JTFEX. To estimate times in the various air quality zones of interest(offshore, nearshore, and onshore), the locations of representative operations were analyzed, and theirpaths plotted. Time in the individual areas was then estimated based upon operational maneuvers androutine flight path analysis.Emissions were estimated based on times in mode, using the Navy’s Aircraft Emission Support Office(AESO) Memorandum Reports for individual aircraft categories (Aircraft Emission Estimates: Landingand Takeoff Cycle and Maintenance Testing, and Aircraft Emission Estimates: Mission Operations). Foraircraft for which AESO emission factors were not available (such as the Learjet and Gulfstream aircraft),emission factors were obtained from the Federal Aviation Administration’s (FAA’s) Emission andDispersion Modeling System (EDMS), which is the FAA’s approved model for military airfield andcivilian airport operations.4.1.2 Surface Ship OperationsMarine surface vessels include naval ship and military boat traffic participating in theCOMPTUEX/JTFEX activities, as well as support vessels providing various services for the militarytraining operations and tests. The methodology of estimating marine vessel emissions involvesevaluating the type of operation for each type of vessel, the number of hours of operation for each vesseltype, the type of propulsion engine in each vessel, and the type of generator used onboard each type ofvessel.Emission factors for marine vessels were obtained from the database developed for Naval Sea SystemsCommand (NAVSEA) by JJMA Consultants (JJMA, 2001) and the EPA’s AP-42 emission factors forcombustion of diesel (EPA, 1996). Emission factors were provided for each marine vessel type andoperational mode (i.e., power level). The resulting calculations provided information regarding the timespent at each power level during the COMPTUEX/JTFEX, emission factors for that power level (in lbs ofpollutant per hour), and total emissions for each marine vessel for each operational type and mode.February 2007 4-2