We want to put in an outdoor washbay behind the shop. Everybody has a different opinion, floor drains, slope to the ditch, permanent ladder rack, etc.

what does everybody else have?

Do yourself a favor. Capture, filter and reuse the water. The EPA is your worst nightmare if they catch you draining that water out into the public domain. It requires planning and extra money to get it all done right. Any way you slice it its cheaper than paying for some “toxic cleanup” and then doing it right.

geez, of all the stuff weve talked about that never came up, but, good point

Heck I always took our inside wash bay for granted with steam cleaner and pit for waste.  Sure is great in the winter time even though cannot unfold the booms

I don't know what state you in but we redid ours and it was $70,000 to do. had to reclaim all water and waste. grease and oil are considered hazardous waste. this is in Cali. hopefully yours is not that bad. we have a steam cleaner(which is only used as a pressure washer except for some apps) and we have a boom that comes out from building with 40' hose on it so we can reach the whole pump. if you can get away with it what we had before was a two sump system.

Hey i can tell you that when i hauled hazmat in north carolina I would pick up 20yrd dumpsters with dirt that had oil,grease,concrete chunks in and haul it to the dump.They had a pad out back that was40ft. by 60ft. that was poured in concrete with concrete stem wall about 2ft. high to keep the contaminated dirt in a safe place.then they had a bobcat to scoop it up and put it in the dumpster.Just a thought.