(a) A grit washing unit or grit storage area must be designed to return recycled water and drainage to the headworks of the wastewater treatment facility.(b) A grit chamber located below ground level must include mechanical grit handling equipment.(c) Grit must be stored in a container with a tight-fitting cover and must be managed and disposed of in accordance with §217.123 of this title (relating to Screenings and Debris Handling).