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Rear-Loaded Trailers <br /> Trailer Requirements*b <br /> # _ ( TPH ) (Cycle Time) <br /> (Payload) ( Trip ) <br /> Where cycle time equals the total of: <br /> • Round Trip Haul Time = 0. 68 Hours <br /> • Load Time = 0 . 33 <br /> • Unload and Coupling <br /> Time = 0 . 50 <br /> 1. 51 Hours <br /> # _ (53/18) (1. 51) = 4. 45 or 5 <br /> Total Trailers Including Spares = 6 <br /> Tractor Requirements <br /> # _ ( TPH ) (Cycle Time) <br /> (Payload) Trip <br /> Where cycle time equals the total of: <br /> • Round Trip Haul Time = 0.68 Hours <br /> Unload and Coupling <br /> Time = 0 . 50 <br /> 1. 18 Hours <br /> # _ (53/18) (1. 18) = 3. 47 or 4 <br /> Total Tractors Including_ Spare = 5 <br /> Capital Costs <br /> (6) Trailers @ $39, 000 = $234,000 <br /> (5) Tractors @ $41,000 = 205, 000 <br /> $439,000 <br /> Annual Haul Costs <br /> Amortization @ 80, 8 years $ 76 ,400 <br /> Labor, 4 drivers @ $27 , 700/year 110 ,800 <br /> O & M 86, 800 <br /> Total $274 , 000 <br /> * <br /> Tractors are not required to wait for loading. Therefore, less <br /> are needed. <br /> - 44 - <br />