APPENDIX A6$_{ }$ APPENDIX A6 - Construction Emissions Inventory for  Criteria Pollutants  A6.1  Overview  A6.2  Methodology  A6.2.1  Construction Equipment Schedule  40  FAA’s Advisory Circular 150-5320-6D,  Airport Pavement Design and Evaluation , September 30, 2009,  http://www.faa.gov/documentLibrary/media/Advisory_Circular/150_5320_6e.pdf.  39  R S Means Company,  Means Productivity Standards for Construction , Third Edition, August 1994.  46$_{ }$ The construction equipment schedule specifies which vehicles/equipment are  anticipated, when  the vehicles/equipment will be used, the number of units, and how many hours it will be used.  Along with vehicle/equipment usage, the construction schedule should also estimate manpower.  If unavailable, manpower can be estimated based on  the number of pieces of equipment times  125 percent. Typical construction is anticipated to occur six days per week and ten hours per day.  Data regarding the number of pieces and types of construction equipment to be used, deployment schedule of equipment (monthly and annually), and the approximate daily operating  time (including power level or usage factor) should be estimated for each individual construction  project based on a schedule of construction activity. The estimates should be provided by project  phase and subcomponent. These data can be estimated using  RS Means Productivity Standards  for Construction 39  and FAA’s Advisory Circular 150-5320-6D,  Airport Pavement Design and  Evaluation 40 , provided the quantity of construction materials likely to be involved in construction is known.  Emissions from construction activities are estimated based on the projected construction activity  schedule, the number of vehicles/pieces of equipment, the types of equipment/type of fuel used,  vehicle/equipment utilization rates, and the year(s) in which  construction occurs. Emissions of  CO, VOC, NO$_{x}$, SO$_{2}$, PM$_{10}$, and PM 2.5  should be evaluated. The following section details the  calculation steps, methods and other considerations for estimating emissions from construction  activities.  While the understanding of emissions from various airport sources is improving, methodology for calculating construction emissions remains highly variable. The FAA’s  EDMS/AEDT currently does not explicitly account for construction emissions, and few  resources offer guidance for estimating such emissions.  Construction-related emissions are primarily associated with the exhaust from heavy  equipment  (e.g., backhoes, bulldozers, graders, etc.), delivery trucks (e.g., cement trucks, dump trucks, etc.)  and construction worker vehicles getting to and from the project site; dust from site preparation,  land clearing, material handling, and equipment movement on unpaved areas, wind erosion; and  demolition activities. These emissions are temporary in nature ( i.e., during the construction  period only) and generally confined to the construction site and the access/egress roadways.  Construction activities also involve the storage/transportation of raw materials, the disposal of  construction debris and the production of asphalt or concrete. 