These are some links for the government website with additional information.
For Oklahoma
Petroleum Storage Tank (oklahoma.gov)
DEQ Home – Oklahoma Department of Environmental Quality
Oklahoma Water Resources Board | The Water Agency
EPA Region 6 (South Central) | US EPA
For Michigan
Environment, Great Lakes, and Energy (michigan.gov)
Leaking Underground Storage Tanks Program (michigan.gov)
Environmental Info for Michigan | US EPA
Not State Specific
Spill Prevention, Control, and Countermeasure (SPCC) for the Upstream (Oil Exploration and Production) Sector | US EPA
Developing a Stormwater Pollution Prevention Plan (SWPPP) | US EPA
