Laserfiche WebLink
~ Coal Haul Truck Trips: <br />The number of coal haul trips per day was calculated by taking the <br />I <br />annual production lever in tons, dividing by 250 workdays per year, and <br />i then dividing by 28 tons per truck. Multiplying the result by 2 yielded <br />i_ <br />the number of one-way truck trips (haul and return) per day. Assuming two <br />~,_ eight-hour shifts, even production and haul during the shifts, the number <br />~- of one-way trips per hour was calculated by dividing by 16 hours. For <br />L 1.3-million TPY, the calculations were: <br />~ 1,300,000: 250 =. 28 x 2 ~ 16 = 23 truck-trips/hour. <br />i <br />~. The number of trucks needed to make 23 truck-trips/hour is 5, or about <br />- the same number being used today at 700,000 TPY and one eight-hour shift. <br />`• Employee Commuting Trips: <br />It was assumed in the analysis that every employee would travel on the <br />4 <br />~_ study section of SH 133.* It was also assumed that there would only be two <br />~-- shifts and that the peak hour would occur during a shift change and would <br />in essence include all employees (the day shift going home and the evening <br />shift coming to work). This condition represents the "worst case", making <br />~:. <br />the results of the analysis more conservative than the results would be under <br />r <br />the assumption of a three-shift mining operation and a two-shift trucking <br />- operation. <br />r- <br />j Since the traffic counts already include the employee commute at <br />,L <br />X00,000 TPY, it was only necessary to estimate the trips created by the <br />I <br />. Although only about lOk of the existing employees actually travel along <br />the study section, virtually every employee travels through the inter- <br />section of SH 133 and Stevens Gulch Road. Hence, all employees were <br />~. included in the study section. <br />'` -15- <br />