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where: k(PMio) = 1.5 (empirical constant) S = 10%(silt content) (use whole number value) W = 34 tons (mean vehicle weight, average of empty and full) ` p = 72 (precipitation days) a = 0.9 (empirical constant) b = 0.45 (empirical constant) CE = 75%(empirical constant) Based on available data,the emission factor for unpaved roads is 0.568 pounds of PM10 per ` vehicle mile traveled(uncontrolled) and 0.456 pounds of PM10 per vehicle mile traveled (controlled). To account for emission controls, a control efficiency of 75%was applied. Weather ` data(days of measurable precipitation) from htti)://www.wrce.dri.edu/summga for Lodi, California. The project condition provides for 981 and 256,041 (see Transportation and Traffic section)daily and annual round-trip vehicle trips,respectively, each presumed to be traveling a °i distance of 1/2 mile on unpaved roads and within the circulation area(per trip). Nonroad Equipment and Mobile Vehicles The types of nonroad equipment at the project site include loaders, grader, excavators,off- highway trucks(such as water trucks), scrapers,and haul trucks. Emission factors for all v equipment except haul trucks and pickup trucks were obtained from the U.S. EPA's NONROAD model and documentation and databases prepared in support of NONROAD. The NONOAD model considers the rules of 40 CFR Part 89 that establish standards for emissions of CO, VOC, NOx, and PM on equipment of the type used in the construction and other industries. Emission factors for each equipment type were applied to the anticipated equipment work output (horsepower-hours of expected equipment use). Average horsepower,hours of operations,and 4 load factors were developed based on NONROAD databases, specifically for California. ` Emission factors for haul trucks were obtained from the EMFAC2002 model. Haul trucks with a gross vehicle weight greater than 8,500 pounds(heavy trucks). The pickup trucks were conservatively assumed to travel 50 miles each day, although they are mainly used for inspection and supply/personnel transport purposes at the site. The haul trucks were assumed to travel 50 miles each way between the facility and the aggregate markets, a conservative estimate given the distance between the project site and typical markets. Table AQ-6 presents the nonroad usage data. Table A-7 and Table A-8 present the emission factors used of nonroad equipment and ` motor vehicles for 2007 and 2021,respectively.