Section 310.350  Continuation of Authorization

a)         Inclusion in POTW Permit.  Once a POTW has received authorization to grant removal credits for a particular pollutant regulated in a categorical pretreatment standard it may automatically extend that removal credit to the same pollutant when it is regulated in other categorical standards, unless granting the removal credit will cause the POTW to violate the sludge requirements identified in Section 310.303(d) or its NPDES permit limitations and conditions as required by Section 310.303(e).  If a POTW elects at a later time to extend removal credits to a certain categorical pretreatment standard, industrial subcategory, or one or more industrial users that initially were not granted removal credits, it must notify the Agency.

b)         Compliance Monitoring.  Once authority is granted, the removal credits must be included in the POTW's NPDES permit as soon as possible and must become an enforceable requirement of the POTW's NPDES permit.  The removal credits will remain in effect for the term of the POTW's NPDES permit if the POTW maintains compliance with the conditions specified in Section 310.351.

c)         Modification or Withdrawal of Removal Credits.  Following authorization to grant removal credits, a POTW must continue to monitor and report the POTW's removal capabilities at intervals specified by the Agency in the pretreatment program and NPDES permit, but in no case less than once per year.  The Agency must require a minimum of one representative sample per month during the reporting period.  The POTW must include all sampling data in the POTW's compliance report.

BOARD NOTE:  Derived from 40 CFR 403.7(f)(1) through (f)(3) (2003).

(Source:  Amended at 47 Ill. Reg. 5083, effective March 23, 2023)