That will depend dramatically on what the water is contaminated with and if the contamination was also in the sediments and/or the groundwater system of the lake.
Essentially the cost of food, water, and fuel to get them there. The fuel cost will depend on what you are driving.
A lot
8.00
12$
ask workid
3.00
alot
Water cost £1.00
How much does a water frame cost?
1m
1 gallon