Experience trumps cost.
Even a well operated facility will have environmental monitoring snags. Anyone can handle environmental monitoring when there are no issues; it's knowing how to deal with the issues and navigate permit conditions and the regulatory mazes that separates the "wheat from the chaff." Don't settle for chaff, you need sustenance.
Groundwater monitoring
Explosive gases monitoring
Leachate monitoring
Stormwater monitoring
NSPS compliance
Environmental monitoring plans
Well installation
GCCS oversight
Liquids balance and audit