Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 310 - PRETREATMENT PROGRAMS
Subpart C - REMOVAL CREDITS
Section 310.320 - Compensation for Overflow
Current through Register Vol. 48, No. 38, September 20, 2024
A POTW that overflows untreated wastewater to receiving waters one or more times in a year may claim consistent removal of a pollutant only by complying with subsection (a) or (b). However, this Section will not apply if an industrial user demonstrates that overflow does not occur between the industrial user and the POTW treatment plant.
a) The industrial user provides containment or otherwise ceases or reduces discharges from the regulated processes that contain the pollutant for which an allowance is requested during all circumstances in which an overflow event can reasonably be expected to occur at the POTW or at a sewer to which the industrial user is connected. Discharges must cease or be reduced, or pretreatment must be increased, to the extent necessary to compensate for the removal not being provided by the POTW. The Agency must allow allowances under this subsection only if the POTW demonstrates the following to the Agency:
b) Reduction in Removal
where:
rm |
= |
POTW's consistent removal rate for that pollutant as established under this Subpart. |
rc |
= |
Removal corrected by the overflow factor. |
Z |
= |
Hours per year that overflow occurred between the industrial user and the POTW treatment plant, the hours either to be shown in the POTW's current NPDES permit application or the hours, as demonstrated by verifiable techniques, that a particular industrial user's discharge overflows between the industrial user and the POTW treatment plan. |
BOARD NOTE: Derived from 40 CFR 403.7(h) (2005), as amended at 70 Fed. Reg. 60134 (Oct. 14, 2005).