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IEMISSION INVENTORY ASSUMPTIONS <br />Fugitive Dust on Unpaved Roads -- was estimated using the <br />equatiaDn from AP--42 (Compilation of Air Pollutant Emission <br />Factorls),, Section 11.2.1. Variables utilized included k - 0.6 <br />and 0.45, s = 24 %, S = 30 mph, W = 25 tons, w = 16 wheels, and p <br />= 40 days /year. <br />Construietion Equipment Emissions -- estimates of the type and <br />numbesEcof construction equipment required, for roadway <br />constnuwtion were provided by Poss Construction. Equipment <br />emissica factors are from AP -42 Section 3.2.7 Table 3.2.7 -1. <br />Vebiclipe Miles Travelled -- the project will result in an increase <br />in VMT *or future design year 2006 based on traffic data provided <br />by Wilbdan Associates in April of 1987 (see Table 2 -2 on page 2-- <br />2). <br />Emission Factors -- motor vehicle emission were provided by the <br />OCEMA firom 1984 and 1985 runs using the California ARB ENV028 <br />program based upon EMFAC 6D emission rates as shown in the fol- <br />lowing table. <br />CALIFORNIA CORRECTED MOTOR VEHICLE <br />EMISSION FACTORS <br />Pollutant 1987 (gm /mil 2006 (gm /mi) <br />18 mph 20 mph 9 mph 19 mph 31 mph <br />CO 24.88 22.97 30.25 17.31 11.12 <br />THC 2.51 2.34 3.16 1.76 1.19 <br />NOx 1.78 1.79 1.39 1.27 1.40 <br />sox 0.21 0.21 0.23 0.23 0.23 <br />- Particulates <br />4'- L}�33___ - -_ 033-____ __- a- 31-- ____(]- 3z-- y_-- a 3l <br />- <br />____ <br />These facctors assume the Orange County vehicle mix (77.6% LDA, <br />10.6% LDT, 5.3% MDT, 2.0% HDG, 3.6% HDD and 0.9$ MC). They also <br />assume aen ambient temperature of 75 degrees Fahrenheit and 28% <br />cold start, 19% hot start and 53% hot stabilized. operation. They <br />are utilized for all projects located within Orange County. <br />Average Route Speeds --- along Bristol Street were provided by <br />Willdan Associates as shown in Table 2 -2 on page 2 -2. <br />0 <br />