Current through Register Vol. 48, No. 38, September 20, 2024
a)
In the closure plan under Section
725.212
and the post-closure plan under Section
725.218
the owner or operator must address the following objectives and indicate how
they will be achieved:
1) Control of the
migration of hazardous waste and hazardous waste constituents from the treated
area into the groundwater;
2)
Control of the release of contaminated runoff from the facility into surface
water;
3) Control of the release of
airborne particulate contaminants caused by wind erosion; and
4) Compliance with Section
725.376
concerning the growth of food-chain crops.
b) The owner or operator must consider at
least the following factors in addressing the closure and post-closure care
objectives of subsection (a):
1) The type and
amount of hazardous waste and hazardous waste constituents applied to the land
treatment facility;
2) The mobility
and the expected rate of migration of the hazardous waste and hazardous waste
constituents;
3) The site location,
topography, and surrounding land use with respect to the potential effects of
pollutant migration (e.g., proximity to groundwater, surface water, and
drinking water sources);
4)
Climate, including amount, frequency, and pH of precipitation;
5) Geological and soil profiles and surface
and subsurface hydrology of the site and soil characteristics, including cation
exchange capacity, total organic carbon, and pH;
6) Unsaturated zone monitoring information
obtained under Section
725.378;
and
7) The type, concentration, and
depth of migration of hazardous waste constituents in the soil, as compared to
their background concentrations.
c) The owner or operator must consider at
least the following methods in addressing the closure and post-closure care
objectives of subsection (a):
1) Removal of
contaminated soils;
2) Placement of
a final cover, considering the following:
A)
Functions of the cover (e.g., infiltration control, erosion and runoff control,
and wind erosion control); and
B)
Characteristics of the cover, including material, final surface contours,
thickness, porosity and permeability, slope, length of run of slope, and type
of vegetation on the cover; and
3) Monitoring of groundwater.
d) In addition to the requirements
of Subpart G of this Part during the closure period the owner or operator of a
land treatment facility must do the following:
1) It must continue unsaturated zone
monitoring in a manner and frequency specified in the closure plan, except that
soil pore liquid monitoring may be terminated 90 days after the last
application of waste to the treatment zone;
2) It must maintain the run-on control system
required under Section
725.372(b);
3) It must maintain the run-off management
system required under Section
725.372(c);
and
4) It must control wind
dispersal of particulate matter that may be subject to wind
dispersal.
e) For the
purpose of complying with Section
725.215,
when closure is completed the owner or operator may submit to the Agency
certification both by the owner or operator and by an independent, qualified
soil scientist, in lieu of a qualified Professional Engineer, that the facility
has been closed in accordance with the specifications in the approved closure
plan.
f) In addition to the
requirements of Section
725.217,
during the post-closure care period the owner or operator of a land treatment
unit must fulfill the following requirements:
1) It must continue soil-core monitoring by
collecting and analyzing samples in a manner and frequency specified in the
post-closure plan;
2) It must
restrict access to the unit as appropriate for its post-closure use;
3) It must assure that growth of food chain
crops complies with Section 725.376; and
4) It must control wind dispersal of
hazardous waste.
