Best practices include using leakproof, portable washout containers with liners, signage, and access controls

https://remote-wiki.win/index.php/Concrete_Washout_Containment_Options_Compared:_Bags,_Bins,_and_Basins

Best practices include using leakproof, portable washout containers with liners, signage, and access controls, positioned away from drains and sensitive areas to contain sediment and caustic residues.