HELP - Lakeland plumbing issue

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Hi Guys,

I got a question about a property I bought, recently renovated, rented out and now two weeks later problems with the plumbing have arrived.

The house is a 3/1 in Lakeland Florida. Bathroom and kitchen are in the back of the house. Plumbing is old and sceptic. Was solid when inspected a couple months back.

The tenants that recently moved in noticed that there's water dripping outside the house in the back yard when they use the kitchen faucet. The back yard had kind of a puddle. 

My GC went there, thought it's a simple fix with a pipe replacement and he'd be done. Opens the wall and lord behold:

Pipes of steel that are completely rotten. They have been dripping for a while in the concrete block. 

My GC said he's going to replace the plumbing from the kitchen out and all the way to the roof where there's an air vent. The bill is $1,300 which includes all materials, replacing the pipes and putting everything back together and painting the back to match. 

Am I being priced fairly ? 

I am also scared that somewhere in the slab (although no indication of that) and also in the shower and toilet (again no indication of that, water flushes smoothly to the sceptic and no funny smells outside) the plumbing is bad.