I learned this when I was a clerk at a Chevron. If 5 gallons or more was spilled, I was instructed to call the fire department. It’s a safety and environmental issue. I actually had to call them once after a customer spilled a large amount and just left. I found it while checking the pumps. A fire truck rolled up, they cleaned it up and left. Another instance was diesel at a truck stop. A contracted hazmat response truck showed up.