Ill. Admin. Code tit. 35, § 725.378 - Unsaturated Zone (Zone of Aeration) Monitoring
a) The owner or operator must have in
writing, and must implement, an unsaturated zone monitoring plan that is
designed to accomplish the following:
1) It
must detect the vertical migration of hazardous waste and hazardous waste
constituents under the active portion of the land treatment facility,
and
2) It must provide information
on the background concentrations of the hazardous waste and hazardous waste
constituents in similar but untreated soil nearby. This background monitoring
must be conducted before or in conjunction with the monitoring required under
subsection (a)(1).
b)
The unsaturated zone monitoring plan must include, at a minimum, both of the
following:
1) Soil monitoring using soil
cores, and
2) Soil-pore water
monitoring using devices, such as lysimeters.
c) To comply with subsection (a)(1), the
owner or operator must demonstrate in his unsaturated zone monitoring plan that
ensures the following:
1) The depth at which
soil and soil-pore water samples are to be taken is below the depth to which
the waste is incorporated into the soil;
2) The number of soil and soil-pore water
samples to be taken is based on the variability of the following:
A) The hazardous waste constituents (as
identified in Section
725.373(a) and
(b) ) in the waste and in the soil,
and
B) The soil types;
and
3) The frequency and
timing of soil and soil-pore water sampling is based on the frequency, time,
and rate of waste application, proximity to ground water, and soil
permeability.
d) The
owner or operator must keep at the facility its unsaturated zone monitoring
plan and the rationale used in developing this plan.
e) The owner or operator must analyze the
soil and soil-pore water samples for the hazardous waste constituents that were
found in the waste during the waste analysis under Section
725.373(a) and
(b).
Notes
Amended at 29 Ill. Reg. 6389, effective April 22, 2005
BOARD NOTE: As required by Section 725.173, the owner or operator must place all data and information developed under this Section in the operating record of the facility.
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