[bumper globe]

My shop has a separate wash bay area completed with 20' long drain trench pit that is hooked to 4" pipe sewage (goes straight to water treatment) with a grease trap in the middle. The Baltimore city now prohibits washed water to seep into the street starting in 2007 so had to have it done during the shop renovation and for safety reason. And registered with the water treatment center to accept the washed water. We do have to squeegee the water into the drain pit occasionally.