Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 604 - DESIGN, OPERATION, AND MAINTENANCE CRITERIA
Subpart J - OTHER TREATMENT
Section 604.1000 - Presedimentation

a) Basin Design: presedimentation basins must have the capability for dewatering. These basins may include hopper bottoms or a continuous mechanical sludge removal apparatus;

b) Inlet: short-circuiting must be prevented;

c) Bypass: provisions for bypassing presedimentation basins must be included; and

d) Detention time must be adequate. Unless otherwise approved by the Agency under Section 604.145(b), three hours detention is the minimum period.