An engineer wants to run a sanitary sewer either through a deep cut or a lift station. The costs are
estimated as follows. Which design should she select using least cost analysis? The interest rate is
7%. (5 points)
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Deep Cut
Lift Station
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Cost of pipe
$50,000
Cost of lift station
$25,000
Annual O&M
$500/year
$2,000/year
Expected life
40 years
20 years
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