Current through Vol. 41, No. 13, March 15, 2024
(a)
Closure plan required. A
written closure plan shall be submitted to the DEQ at least 90 days prior to
commencing closure, unless a lesser amount of time is granted by the
DEQ.
(b)
Closure plan
amendment. Closure activities shall occur as specified in the closure
plan. Any amendments to the closure plan shall be submitted, in writing, to the
DEQ for review and approval before any closure activity is altered, replaced,
or deleted.
(c)
Commencement
of closure activities. Closure activities shall not commence until the
closure plan and all amendments thereto have been reviewed and approved by the
DEQ.
(d)
Content. The
written closure plan shall include the following information, except as
specifically waived by the DEQ in accordance with OAC
252:616-13-1(c):
(1)
General information. The
following general information shall be provided in all closure plans:
(A) purpose of closure indicating the reason
why the surface impoundment, tank system or land application site is no longer
in use and whether wastewater or sludge will be closed in place (in-place
closure) or removed (clean closure);
(B) the DEQ Industrial Wastewater Treatment
Permit number for the facility. If the facility has not been permitted, submit
a completed application for a DEQ Industrial Wastewater Treatment
Permit;
(C) the name, address, and
telephone number of all record owner(s) of the land upon which the surface
impoundment, tank system or land application site is located;
(D) if the operator is not the sole record
owner of the land, surface property interests and all water rights, they must
provide a written document from each owner(s) indicating consent to on-site or
off-site disposal of the contents of the surface impoundment, tank system, or
land application site and any other activities associated with
closure;
(E) provide a time
schedule indicating the major closure activities, approximate time to complete
each activity, and the estimated date of final completion of all closure
activities; and
(F) the closure
plan shall include certification by a Registered Professional Engineer, except
for Class III impoundments closed pursuant to the specifications contained in
Appendix E of this Chapter.
(2)
Site assessment. The
following minimum information about the site shall be provided in the closure
plan.
(A)
Soil information.
Identify the type of soil(s) by soil series name impacted and include a
description of the soil profile and the depth to bedrock. List chemical and
physical properties of the soil, and their average values for the site, that
predict transport and fate of the wastewater contained in the surface
impoundment, tank system, or land application.
(B)
Groundwater information.
Identify major and minor aquifers, recharge areas, depth to ground water for
both shallow aquifer and drinking water sources, local and regional direction
of flow, and estimated or background water quality.
(C)
Surface water information.
Identify surface water bodies that may be hydrologically connected to the
groundwater or are immediately downgradient of the surface impoundment, tank
system or land application site. Trace the drainage to the nearest major
watercourse on a topographic map.
(D)
Plans and specifications.
Provide plans and specifications of the impoundment(s), or tank system(s) to be
closed indicating the dimensions of the surface impoundment(s), or tank
system(s), location of inflow and outflow piping, location and thickness of
sludge, and depth of wastewater in the impoundment.
(3)
Wastewater characterization.
The following minimum information about the wastewater shall be included in the
closure plan. Additional information may be required.
(A)
Inventory of wastewater.
Provide an inventory of the types and concentrations of wastewater discharged
to the surface impoundment, or tank system. Indicate the frequency and volume
of each wastewater that was or may have been discharged to or otherwise placed
in the tank system or impoundment.
(B)
Chemical analysis. When
requested by the DEQ, provide a chemical analysis of representative sample(s)
of the sludges, sediments, bottom sediments, liners, or other media.
(4)
Sampling, analysis, and
monitoring plans. Sampling, analysis, and monitoring used
before, during, and after closure shall be proposed to the
DEQ in a written plan as follows:
(A)
Sampling and analysis. Design a sampling and analysis plan that
includes all requirements listed in OAC
252:616-5-4.
(B)
Monitoring. Design a
monitoring plan that will adequately monitor groundwater, soil vapor, or other
media according to OAC
252:616-5-4.
(C)
Sampling and monitoring
locations. Indicate on a facility map the location of each sampling
site, each monitoring site, the direction of groundwater flow, and the wells
used to determine groundwater flow direction.
(5)
Treatment, removal, and
disposal. The closure plan shall include the following minimum
discussion of treatment, removal, and disposal activities, as well as any
additional information requested by the DEQ:
(A)
Treatment. Describe all
methods to be used to treat or reduce any wastewater or sludge from the surface
impoundment or tank system (such as chemical or physical treatment, phase
separation, waste stabilization, or other method). Provide a written rationale
for each treatment method to be used and sufficient evidence of its
effectiveness.
(B)
Removal. Describe all removal activities for all wastewaters,
sludges, liner materials, and subsoils (e.g., volume removed, equipment used,
dust control, and other activities).
(C)
Backfill. If the impoundment
is to be closed by backfilling with soil, estimate the volume of soil needed.
Include discussion of the material to be used as backfill, sampling used to
determine the characteristics of the backfill, the method of compaction, and
other methods to be used.
(D)
Disposal. Provide the name and location of any off-site facility
to be used to dispose of the tank system, the lateral lines, the piping and
fittings, the contents of the tank system or the impoundment, liner materials,
or subsoils, and provide the name of the issuing agency, permit number or other
information necessary to determine authorization obtained for such
disposal.
(6)
In-place closure requirements. The following additional
requirements apply for in-place closure:
(A)
If the pollutants cannot be physically removed or must otherwise be closed
in-place, the closure plan shall include:
(i)
a discussion of remediation alternatives (e.g., clean closure, waste reduction,
or chemical, physical, or biological treatment) and documentation as to
effectiveness of each alternative;
(ii) a discussion of containment
alternatives, (e.g., waste stabilization, impervious cap, or other system) and
documentation as to the effectiveness of the containment measure; and
(iii) a proposal of which remediation or
containment alternative(s) will be implemented for each surface impoundment or
tank system site.
(B)
When impervious caps or covers are proposed to be constructed as a method of
closure in connection with a closure plan, the following requirements shall be
met:
(i) compacted clay caps used to contain
wastes in closed surface impoundments shall have a maximum hydraulic
conductivity of 1 x 10
-7 cm/sec and shall be protected by
covering with a soil layer. The clay cap shall be designed and constructed
according to the requirements of Subchapter 5 relating to clay
liners;
(ii) caps containing
synthetic liners used to contain wastes in closed impoundments shall be
installed according to requirements of Subchapter 5 relating to synthetic
liners in addition to manufacturer's and installer's specifications and
accepted industry practices and shall be protected by covering with a composite
soil and gravel layer; and
(C) address post-closure activities, as
required by the DEQ, such as groundwater monitoring, water or land use
restrictions, or deed restrictions.
(7)
Clean closure requirement.
The following additional requirements apply for clean closure:
(A) provide an evaluation of the feasibility
of clean closure of the surface impoundment, tank system site including a
discussion of available technology, extent of contamination, and other factors;
and
(B) discuss target clean-up
levels of wastewater, the possible risks at those levels, and the methods to be
used to determine that clean closure has been achieved.
Added at 17 Ok Reg 1925, eff 6-12-00 ; Amended at 18 Ok
Reg 1994, eff 6-11-01 ; Amended at 19 Ok Reg 1698, eff 6-13-02 ; Amended at 24
Ok Reg 1526, eff 6-11-07 ; Amended at 30 Ok Reg 1087, eff
7-1-13