They are going to cut a big long slit in the ground, so it's likely going to impact whatever you have there. 

I've worked in most phases of residential construction, but have not yet managed  a project this large.  

I don't have the answer you're looking for, but I also have a house with water pooling around an AT&T fiber box in the ground.

Right now, you're in the information gathering phase.

LOL come on Ohio & Upstate NY you need cooling units as much as you need in ground pools to use for 38 of the 365 days

Also, if the tenant is going for a mortgage, I’m sure that the mortgage company is going to have certain things taken care such as oil tanks in the ground and any other requirements in order to finalize a sale.

Make sure to check the zoning and do a phase 1 environmental to make sure you can do what you want down the road and the property has no environmental issues.

I realize that the best way to find these exact numbers will be to talk to an agent, contractor or property manager but I am just starting with none of those connections and am simply in the learning phase at this moment and am hoping to get a better general idea for repair costs.  

Your lease probably states that illegal activity is grounds for eviction.

I'm also subscribed to SmartBrief and a few other RE digital subscriptions to help with keeping my ear to the ground.