I was on a job on gov’t property in the desert. The sagebrush is protected! A piece of equipment broke a hose and a cup or so of hydraulic fluid spilled on the ground. The guys were prepared and had buckets and shovels and soak pads to clean it up.
And they reported it right away. Job was shut down for a few weeks in order for the gov’t to inspect the job site, go over the equip. maintenance, etc.
That would be inline with my experience on the North Slope. 2,300 reported spills could be a low number since the Alaskan North Slope production began.
Dropping a used oil filter from the pickup would be reported spill.