Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 845 - STANDARDS FOR THE DISPOSAL OF COAL COMBUSTION RESIDUALS IN SURFACE IMPOUNDMENTS
Subpart E - OPERATING CRITERIA
Section 845.510 - Hydrologic and Hydraulic Capacity Requirements for CCR Surface Impoundments
Universal Citation: 35 IL Admin Code ยง 845.510
Current through Register Vol. 48, No. 38, September 20, 2024
a) The owner or operator of an existing or new CCR surface impoundment or any lateral expansion of a CCR surface impoundment must design, construct, operate, and maintain an inflow design flood control system as specified in subsections (a)(1) and (2).
1) The inflow design flood control system
must adequately manage flow into the CCR surface impoundment during and
following the peak discharge of the inflow design flood specified in subsection
(a)(3).
2) The inflow design flood
control system must adequately manage flow from the CCR surface impoundment to
collect and control the peak discharge resulting from the inflow design flood
specified in subsection (a)(3).
3)
The inflow design flood, at a minimum, is:
A)
For a Class 1 CCR surface impoundment, as determined under Section 845.440(a),
the probable maximum flood;
B) For
a Class 2 CCR surface impoundment, as determined under Section 845.440(a), the
1000-year flood; or
C) For an
incised CCR surface impoundment, the 25-year flood.
b) Discharge from the CCR surface impoundment must be handled in accordance with the surface water requirements in Section 845.110(b)(3) and 35 Ill. Adm. Code Subtitle C.
c) Inflow Design Flood Control System Plan
1) Content of the Plan. The owner or operator
must prepare initial and annual inflow design flood control system plans for
the CCR surface impoundment. These plans must document how the inflow design
flood control system has been designed and constructed to meet the requirements
of this Section. Each plan must be supported by appropriate engineering
calculations.
2) Amendment of the
Plan. The owner or operator of the CCR surface impoundment may amend the
written inflow design flood control system plan at any time. The owner or
operator must amend the written inflow design flood control system plan
whenever there is a change in conditions that would substantially affect the
written plan in effect.
3) The
owner or operator must obtain a certification from a qualified professional
engineer stating that the initial and periodic inflow design flood control
system plans meet the requirements of this Section.
4) Timeframe for Plan Submission
A) The owner or operator of a new CCR surface
impoundment must submit to the Agency the initial inflow design flood control
system plan certification with the initial operating permit application before
the initial receipt of CCR in the surface impoundment.
B) The owner or operator of an existing CCR
surface impoundment must submit the initial inflow design flood control system
plan certification with its first annual inspection report required by Section
845.540(b).
C) The owner or
operator of a CCR surface impoundment must submit the annual inflow design
flood control system plan certification each year with the annual inspection
required by Section 845.540(b).
D)
The owner or operator of a new CCR surface impoundment must place each inflow
design flood control system plan in the facility's operating record (see
Section 845.800(d)(8)).
Disclaimer: These regulations may not be the most recent version. Illinois may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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