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CHAPTERFOUR Enuironmenta~ Consequences Gaseous pollutant emission estimates aze based on emission factors presented in The Compilation of Air Pollutant Emission Factors published by the EPA (EPA 1996). This document is referred to as AP-42. Two 500 horsepower diesel-powered engines tyre proposed to be used on each drill rig, operating 24 hours/day for 13 days (total 312 hours), at 65 percent load. A total of 15 wells per year could be completed. The exhaust emissions per well site and total tons per yeaz (tpy) would be as follows: CO = 0.679 ton/well = 10.2 tpy NOx = 3.143 ton/well = 47.1 tpy SOz = 0.213 ton/we11= 3.2 tpy PM~o = 0.224 ton/well = 3.4 tpy VOC = 0.254 ton/wel1= 3.8 tpy Construction activities that would create fugitive dust emissions include clearing,, grading, and general site preparation (including evaporation pond) and the main access roads. Although overall construction is expected to take 18 months, the land disturbance portion of the facility construction is expected to occur during a single construction season (6 months). An emission factor of 1.2 tons/acre/month was used from AP-42, for heavy construction activities. Under the Proposed Action, the total acreage to be developed, including the new access roads, would be approximately 72.2 acres. Colorado Air Pollution Control Regulations require a fugitive dust control plan for any construction site in excess of 25 acres. A control efficiency of 50 percent was attributed to water suppression. Based on these assumptions, the total fugitive dust emissions would be approximately 300 tons. Pipeline Construction activities along the entire pipeline, would create approximately 961 tons of fugitive dust and particulate matter less than l0 microns (PM~o). Additionally, gaseous p~>llutant emissions such as NOx, CO, SOZ, and VOCs would result from operation of the construction equipment. The description of the Proposed Action and alternatives (Chapter 2) includes estimates of the amount of equipment expected during construction of the pipeline. The fugitive dust that would be generated by the construction activities and the related vehicular traffic would be spread along the length of the pipeline (44 miles). Similazly, the effects of the construction activities would be spread along the 44 mile length. The effects wotdd not be significant. Parachute Site General construction activities would create emissions of fugitive dust and par[icirlate matter less than 10 microns (PM~o). Additionally, gaseous pollutant emissions such as NOx, CO, SOZ, and VOCs would result from vehicular traffic. Site preparation and construction activities resulting in ground disturbance would be completed within approximately 6 months. The fugitive dust that would be generated by the construction 4-20 Meteorology and Air Quality