Sentence:  The first project reaps a positive cash flow of $25,000 in the first four years and then <WSD>decommissions</WSD> the investment with a positive cash flow of $470,000 in the fifth year. The second project offers twice as much positive cash flow in the first four years. The third project does not reap any annual cash flows, but <WSD>decommissions</WSD> the investment in the second year for $490,000. 
Meaning of the word marked with <WSD> tags:  To take out of service or to render unusable.