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Two remediation options are being considered for a contaminated land area formerly used for industrial operations. Option 1 involves removing all of the contaminated soil over a two-year period at a cost of $2.2 million per year. Option 2 is to leave the soil in place but treat it with a bioremediation agent at a cost of $950000/year over a three-year period. Subsequently, the soil would be sampled each year for the next five years to ensure the effectiveness of the treatment system. The cost of the sampling program would be $250000 the first year and $80000/year for the remaining four years.
a. Calculate the net present value of each option based on a discount rate of 5%/year. (Hint: draw a cash flow diagram for each of the two options.)
Option 1, NPV = $
Option 2, NPV = $
A new concrete mix is being designed to provide adequate compressive strength for concrete blocks. The specification for a particular application calls for the blocks to have a mean compressive strength greater than 1350 kPa.
The New Jersey Surety Association, in various documented publications discusses the Surety’s relationship with their clients, the best ways to better know your Surety and a brief overview of why the Construction Business can fail.
Using an 9.34 in long wrench, the bolt has now been unscrewed a length of 1.10 in. The force of F={-52.7i +7.00j +6.00k} lb is still applied to the wrench at point B.
If the peak-hour factor is .90 and all of the drivers are regular users, what is the level of the service of this compound-grade freeway segment?
for sizing the syst em, the mean cell residence time is selected to be 5 days. the reactoer kinetic constants are u max= 2.4 d^-1 (1/day), Ks=75 mg/L as COD, Y=0.4 VSS/g COD and Kd=0.096 d^-1(1/day)
Calculate the area of a piece of property bounded by a traverse and circular arc with the following coordinates at angle points: A (1275.11, 1356.11), B (1000.27,1365.70),C (1000.00, 1000.00),D (1450.00, 1000.00)
a rectangular prism box which is floating on water has a length L =1200mm, breadth = 800mm, height = 500mm and mass of 52kg. when the box is loaded with the suspended hexagonal mass, its immersion is 300mm, and when it the mass is placed inside th..
When a fluid flows through a sharp bend, low pressures may developin localized regions of the bend. Estimate the minimumabsolute pressure (in psi) that can develop without causingcavitation if the fluid is water at 160 oF.
How much extra water does a 175 - lb concrete canoe displacecompared to an ultra-lightweight 38 - lb Kevlar canoe of the samesize carrying the same load?
Neglecting kinetic and potential energy changes and assuming the ideal gas model determine the work developed of air flowing through the turbine
The operating cost will be $10,000 per quarter with a salvage value of $25,000 after its 2-year life. Process B will have a first cost of $250,000, an operating cost of $15,000 per quarter and a $40,000 salvage value after its 4-year life.
To adjust the mix so as to increase the compressive strength, the water-to-cement ratio is reduced to 0.45. Will the quality of the coarse aggregate increase, decrease, or stay the same
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