Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 604 - DESIGN, OPERATION, AND MAINTENANCE CRITERIA
Subpart M - STORAGE
Section 604.1335 - Treatment Plant Storage
Universal Citation: 35 IL Admin Code ยง 604.1335
Current through Register Vol. 48, No. 38, September 20, 2024
Treatment plant storage must meet the following requirements.
a) Clearwell storage must:
1) provide contact time, when required,
under Section 604.715;
2) ensure
adequate disinfectant contact time by sizing the clearwell to include extra
volume to accommodate depletion of storage during the nighttime for
intermittently operated filtration plants with automatic high service pumping
from the clearwell during non-treatment hours;
3) be sized in conjunction with distribution
system storage, to relieve the filters from having to follow fluctuations in
water use;
4) provide an overflow
and vent; and
5) provide a minimum
of two clearwells or clearwell compartments.
b) Single wall separation of raw and treated water is prohibited.
c) Other treatment plant storage tanks/basins, including detention basins, backwash reclaim tanks, receiving basins and pump wet wells for treated water, must be designed as finished water storage structures, unless otherwise approved by the Agency under Section 604.145(b).
d) When provided, filter washwater tanks must be sized to provide adequate treated water for the duration of the backwash cycle, including the sequential backwash of several filters.
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