Ill. Admin. Code tit. 35, § 724.322 - Action Leakage Rate
a) The Agency
must approve an action leakage rate for surface impoundment units subject to
Section
724.321(c) or
(d). The action leakage rate is the maximum
design flow rate that the LDS can remove without the fluid head on the bottom
liner exceeding 1 foot. The action leakage rate must include an adequate safety
margin to allow for uncertainties in the design (e.g., slope, hydraulic
conductivity, thickness of drainage material, etc.), construction, operation,
and location of the LDS, waste and leachate characteristics, likelihood and
amounts of other sources of liquids in the LDS, and proposed response actions
(e.g., the action leakage rate must consider decreases in the flow capacity of
the system over time resulting from siltation and clogging, rib layover and
creep of synthetic components of the system, overburden pressures,
etc.).
b) To determine if the
action leakage rate has been exceeded, the owner or operator must convert the
weekly or monthly flow rate from the monitoring data obtained under Section
724.326(d)
to an average daily flow rate (gallons per acre per day) for each sump. The
average daily flow rate for each sump must be calculated weekly during the
active life and closure period and, if the unit is closed in accordance with
Section
724.328(b),
monthly during the post-closure care period, unless the Agency approves a
different frequency pursuant to Section
724.326(d).
Notes
Amended at 27 Ill. Reg. 3725, effective February 14, 2003
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