## APPENDIX A6 - Construction Emissions Inventory for Criteria Pollutants 

## A6.1 Overview 

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. 

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. 

## A6.2 Methodology 

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. 

## A6.2.1 Construction Equipment Schedule 

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. 

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. 

