It would be very difficult for operation not to have gutter in bin wash area as there will be lots of water.
Therefore, we suggest to raise the internal area of garbage room by 100 mm light weight concrete + 50 mm screed.
We can have shallow floor drains less than 100 mm and other 50 mm can be used for sloping the drain pipes towards the door within the topping. This way we can keep function as well as avoid pipes below as mentioned by Khun Sutat.
Attached please see our suggested ideas and let us know if this is acceptable.
If acceptable, we will issue CAD files to all team members.