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A contractor operates a rock crusher and stores the material until needed in an adjacent stockpile area. The stockpile area is unpaved, and some of the stockpiled aggregate is contaminated by the sub-grade and cannot be used. The estimated stockpile losses are shown in the Table 1. This equates to a combined loss of 8% each year. Table 1 Current Stockpile Losses Material Size Loss A" minus 12% – 20% 4" minus & 4" x #4 8% – 15% 12" minus & 1%" x ¾" 4% – 10% The paving will cover 4.56 acres. The previous stockpile losses will serve as sub-grade and base courses for the new surfacing. A 3" thick surface will require 3700 tons of asphaltic concrete, which costs $20/ton installed. The engineering and site work involve a one-time cost of about $5000. The surface requires routine maintenance costing about $1000/year. Determine the internal rate of return (IRR) of the stockpile area paving.

A contractor operates a rock crusher and stores the material until needed in an adjacent stockpile area. The stockpile area is unpaved, and some of the stockpiled aggregate is contaminated by the sub-grade and cannot be used. The estimated stockpile losses are shown in the Table 1. This equates to a combined loss of 8% each year. Table 1 Current Stockpile Losses Material Size Loss A" minus 12% – 20% 4" minus & 4" x #4 8% – 15% 12" minus & 1%" x ¾" 4% – 10% The paving will cover 4.56 acres. The previous stockpile losses will serve as sub-grade and base courses for the new surfacing. A 3" thick surface will require 3700 tons of asphaltic concrete, which costs $20/ton installed. The engineering and site work involve a one-time cost of about $5000. The surface requires routine maintenance costing about $1000/year. Determine the internal rate of return (IRR) of the stockpile area paving.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A contractor operates a rock crusher and stores the material until needed in an adjacent stockpile area. The stockpile area is unpaved, and some of the stockpiled aggregate is contaminated by the sub-grade and cannot be used. The estimated stockpile losses are shown in the Table 1. This equates to a combined loss of 8% each year. Table 1 Current Stockpile Losses Material Size Loss 4" minus 12% – 20% 4" minus & 4" × #4 8% – 15% 12" minus & 1½" x 4" 4% – 10% The paving will cover 4.56 acres. The previous stockpile losses will serve as sub-grade and base courses for the new surfacing. A 3" thick surface will require 3700 tons of asphaltic concrete, which costs S20/ton installed. The engineering and site work involve a one-time cost of about $5000. The surface requires routine maintenance costing about $1000/year. Determine the internal rate of return (IRR) of the stockpile area paving.
Transcribed Image Text:A contractor operates a rock crusher and stores the material until needed in an adjacent stockpile area. The stockpile area is unpaved, and some of the stockpiled aggregate is contaminated by the sub-grade and cannot be used. The estimated stockpile losses are shown in the Table 1. This equates to a combined loss of 8% each year. Table 1 Current Stockpile Losses Material Size Loss 4" minus 12% – 20% 4" minus & 4" × #4 8% – 15% 12" minus & 1½" x 4" 4% – 10% The paving will cover 4.56 acres. The previous stockpile losses will serve as sub-grade and base courses for the new surfacing. A 3" thick surface will require 3700 tons of asphaltic concrete, which costs S20/ton installed. The engineering and site work involve a one-time cost of about $5000. The surface requires routine maintenance costing about $1000/year. Determine the internal rate of return (IRR) of the stockpile area paving.
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