RCRA ground water assessment plans and annual ground water quality assessment reports at interim status facilities Page: 5 of 6
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" If the evaluation shows that the require-
ments of 40 CFR 265.91(a) are no longer
satisfied, the facility owner or operator
must immediately modify the number,
location, or depth of the monitoring wells
in order to bring the groundwater monitor-
ing system into compliance. [40 CFR
265.93(d)(4)(f)]
What actions must be taken if the result
of the first determination is that
hazardous waste has entered the ground
water?
If hazardous waste or hazardous waste con-
stituents from the facility have entered the ground
water, the required subsequent steps must be
based upon whether the groundwater quality
assessment plan was implemented prior to final
closure of the facility or whether the plan was
implemented during the post-closure care period.
" If the facility owner or operator imple-
mented the plan prior to the final closure of
the facility, the facility owner or operator
must continue making determinations
quarterly under 40 CFR 265.94(d)(4) until
final closure of the facility. [40 CFR
265.94(d)(7)(I)] Any groundwater quality
assessment must be completed and reported
in accordance with 40 CFR 265.93(d)(5)
(i.e., submit a written report of each deter-
mination to EPA or the authorized State
within 15 days). [40 CFR 265.93(e)]
" If the groundwater quality assessment
program was implemented during the post-
closure period, the facility owner or opera-
tor may cease determining the rate, concen-
tration, and extent of migration of hazard-ous waste or hazardous waste constituents
in the ground water. [40 CFR
265.93(d)(7)(ii)]
What are the recordkeeping and
reporting requirements?
Recordkeeping and reporting is dependent
upon whether or not the ground water is moni-
tored as part of the groundwater quality assess-
ment plan required by 40 CFR 265.93(d)(4). If
the ground water is required to be monitored to
meet the requirements of a groundwater quality
assessment plan, the owner or operator must
report and maintain records as follows:
" Report Annually: Until final closure of the
facility, submit a report to EPA or the
authorized State that contains the results of
the facility's groundwater quality assess-
ment program. The report must include,
but is not limited to, the calculated (or
measured) rate of migration of hazardous
waste or hazardous waste constituents in
the ground water during the reporting
period. The information must be submitted
no later than March 1 of the following year.
[40 CFR 265.94(b)(2)]
" Maintain Records: The analyses and
evaluations specified in the plan, which
satisfy the requirements of 40 CFR
265.93(d)(3), must be maintained through-
out the active life of the facility and, for
disposal facilities, throughout the period of
post-closure care as well. [40 CFR
265.94(b)(1)]
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RCRA ground water assessment plans and annual ground water quality assessment reports at interim status facilities, report, March 1, 1996; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc664041/m1/5/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.