$17.$ Two possible routes for a power line are under study. In both cases the power line will last $15$ years, have no salvage value, have annual property taxes of $2\%$ of first cost, and have a yearly power loss of $$500/$km$.$

Around the Lake Under the Lake

length $($km$.)155$

IC $($$$/$km$.)$ $$9,000$ $$25,000$

O&M $($$$/$km$./$yr$)$ $$200$ $$300$

useful life $($yr$.$s$)1515$

a$)$ If $6\%$ is used, should the power line be routed around the lake or under it$?$

b$)$ What aspects of the environment do you think would be most affected by a power line, and what policies and technologies are being used to eliminate or mitigate concerns?