Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 817 - REQUIREMENTS FOR NEW STEEL AND FOUNDRY INDUSTRY WASTES LANDFILLS
Subpart D - NEW STEEL AND FOUNDRY INDUSTRY LOW RISK WASTE LANDFILLS
Section 817.413 - Groundwater Impact Assessment
Universal Citation: 35 IL Admin Code ยง 817.413
Current through Register Vol. 48, No. 38, September 20, 2024
The impacts of the seepage of leachate from the unit shall be assessed in a systematic fashion using the techniques described in this Section.
a) Procedures for performing the groundwater impact assessment:
1) The
operator shall estimate the amount of seepage from the unit during operations
which assume:
A) That the minimum design
standards for slope configuration, cover, liner, leachate drainage, and
collection system apply; and
B)
That the actual design standards planned for the unit apply. Other designs for
the unit may be used if determined by the operator to be appropriate to
demonstrate the impacts to groundwater.
2) The concentration of constituents in the
leachate shall be determined from actual leachate samples from the waste or
similar waste, or laboratory-derived extracts.
3) The operator shall estimate the capability
of the geology and hydrology beneath the unit to meet the groundwater quality
standards of Section
817.416
at the edge of the zone of attenuation. The estimate shall be made in
accordance with the following:
A) Determine
the aquifer conductivity and gradient using the hydrogeologic information
collected pursuant Section
817.411.
If the aquifer conductivity is 1x10-5 cm/sec or
less, no further groundwater impact assessment is required;
B) Develop a conceptual groundwater flow
model of the site to determine the soil units through which leachate
constituents may migrate;
C)
Determine the organic carbon content for soil units through which the leachate
constituents may migrate;
D)
Determine the retardation factor for constituents of interest based on
traditional hydrogeological methods;
E) Determine MALC values for constituents of
interest required to achieve compliance with the applicable groundwater quality
standards specified at Section 817.416;
F) Compare the calculated MALC values to the
leachate values for the expected waste streams to determine whether compliance
with groundwater standards can be met.
b) Acceptable groundwater impact assessment. The groundwater impact shall be considered acceptable if the leachate values for the expected waste streams are less than the MALC values calculated in accordance with subsection 817.413(a)(3)(F).
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