Haw. Code R. § 11-265-255 - Action leakage rates
(a) The owner or
operator of waste pile units subject to section 11-265-254 must submit a
proposed action leakage rate to the director when submitting the notice
required under section 11-265-254. Within 60 days of receipt of the
notification, the director will: Establish an action leakage rate, either as
proposed by the owner or operator or modified using the criteria in this
section; or extend the review period for up to 30 days. If no action is taken
by the director before the original 60 or extended 90 day review periods, the
action leakage rate will be approved as proposed by the owner or
operator.
(b) The director shall
approve an action leakage rate for waste pile units subject to section
11-265-254. The action leakage rate is the maximum design flow rate that the
leak detection system (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), 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.).
(c) To determine if the action leakage rate
has been exceeded, the owner or operator must convert the weekly flow rate from
the monitoring data obtained under section 11-265-260, to an average daily flow
rate (gallons per acre per day) for each sump. Unless the director approves a
different calculation, the average daily flow rate for each sump must be
calculated weekly during the active life and closure period.
Notes
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