When the truck crashed at just before 11:30 a.m. between Custer City and Songbird Road diesel fuel, motor oil, transmission fluid, gear lube and hydraulic oil spilled onto the road.
Emergency crews built overflow dams to contain the fluid.
The Dallas-Morris Well Services truck was being driven by 21-year-old Daniel Gerhart of Roulette. He lost control of it while negotiating a curve, and the truck went off the road, where it hit an embankment and some trees.
Gerhart was flown to ECMC in Buffalo as a precaution, and was released a few hours later. Dallas-Morris says DEP is satisfied with the cleanup, but will continue monitoring the site.