Ohio Admin. Code 3745-65-93 - Preparation, evaluation, and response
(A)
Before November 19, 1981, the owner or operator shall prepare an outline of a
ground water quality assessment program. The outline shall describe a more
comprehensive ground water monitoring program than that described in rules
3745-65-91
and
3745-65-92
of the Administrative Code, which shall be
is capable of determining
the following:
(1) Whether hazardous waste or hazardous
waste constituents have entered the ground water.
;
(2) The rate and extent of migration of
hazardous waste or hazardous waste constituents in the ground water.
; and
(3) The concentrations of hazardous waste or
hazardous waste constituents in the ground water.
(B) For each indicator parameter specified in
paragraph (B)(3) of rule
3745-65-92
of the Administrative Code, the owner or operator shall calculate the
arithmetic mean and variance, based on at least four replicate measurements on
each sample, for each well monitored in accordance with paragraph (D)(2) of
rule
3745-65-92
of the Administrative Code, and compare these results with that parameter's
initial background arithmetic mean. The comparison shall consider individually
each of the wells in the monitoring system, and shall use the "Student's
T-test" at the 0.01 level of significance (see the appendix to this rule) to
determine statistically significant increases, and decreases in the case of pH,
over initial background.
(C)
Well comparison.
(1) If the comparisons for the upgradient
wells made under paragraph (B) of this rule show a significant increase, or pH
decrease, the owner or operator shall submit this information in accordance
with paragraph (A)(2)(b) of rule
3745-65-94
of the Administrative Code.
(2) If
the comparisons for downgradient wells made under paragraph (B) of this rule
show a significant increase, or pH decrease, the owner or operator shall then
immediately obtain additional ground water samples from those downgradient
wells where a significant difference was detected, split the samples in two,
and obtain analyses of all additional samples to determine whether the
significant difference was a result of laboratory error.
(D)
Analysis,
notification, and plan.
(1) If the
analyses performed under paragraph (C)(2) of this rule confirm the significant
increase, or pH decrease, the owner or operator shall provide written notice to
the director, within seven days after the date of such confirmation, that the
facility may be affecting ground water quality.
(2) Within fifteen days after the
notification under paragraph (D)(1) of this rule, the owner or operator shall
develop and submit to the director a
specific plan, based on the outline required under paragraph (A) of this rule
and certified by a qualified geologist or geotechnical engineer, for a ground
water quality assessment at the facility. This plan
shall be placed in the facility's operating record and maintained until closure
of the facility.
(3) The plan
to be submitted under paragraph (D)(1) of rule
3745-65-90
of the Administrative Code or paragraph (D)(2) of this rule shall specify
the following:
(a) The number, location, and depth of
wells.
;
(b)
Sampling and analytical methods for these
those hazardous
wastes or hazardous waste constituents in the facility.
;
(c) Evaluation procedures, including any use
of previously gathered ground water quality information.
; and
(d) A schedule of implementation.
(4) The owner or operator shall
implement the ground water quality assessment plan which satisfies the
requirements of paragraph (D)(3) of this rule, and, at a minimum, determine
both:
(a)
The rate and extent of migration of the hazardous waste or hazardous waste
constituents in the ground water.
; and
(b)
The concentrations of the hazardous waste or hazardous waste constituents in
the ground water.
(5) The
owner or operator shall make the first determination under paragraph (D)(4) of
this rule as soon as technically feasible, and,
within fifteen days after that determination, submit to the director
prepare a written report containing an assessment of the
ground water quality. This report shall be placed in
the facility's operating record and maintained until closure of the
facility.
(6) If the owner or
operator determines, based on the results of the first determination under
paragraph (D)(4) of this rule, that no hazardous waste or hazardous waste
constituents from the facility have entered the ground water, then the owner or
operator may reinstate the indicator evaluation program described in rule
3745-65-92
of the Administrative Code and paragraph (B) of this rule. If the owner or
operator reinstates the indicator evaluation program, the owner or operator
shall so notify the director in the report submitted under paragraph (D)(5) of
this rule.
(7) If the owner or
operator determines, based on the first determination under paragraph (D)(4) of
this rule, that hazardous waste or hazardous waste constituents from the
facility have entered the ground water, then the owner or operator:
(a) Shall continue to make the determinations
required under paragraph (D)(4) of this rule on a quarterly basis until final
closure of the facility, if the ground water quality assessment plan was
implemented prior to final closure of the facility; or
(b) May cease to make the determinations
required under paragraph (D)(4) of this rule, if the ground water quality
assessment plan was implemented during the post-closure care period.
(E) Notwithstanding any
other provision in rules
3745-65-90
to
3745-65-94
of the Administrative Code, any ground water quality assessment to satisfy the
requirements of paragraph (D)(4) of this rule which is initiated prior to final
closure of the facility shall be completed and reported in accordance with
paragraph (D)(5) of this rule.
(F)
Unless the ground water is monitored to satisfy the requirements of paragraph
(D)(4) of this rule, at least annually the owner or operator shall evaluate the
data on ground water surface elevations obtained under paragraph (E) of rule
3745-65-92
of the Administrative Code to determine whether the requirements under
paragraph (A) of rule
3745-65-91
of the Administrative Code for locating the monitoring wells continues to be
satisfied. If the evaluation shows that paragraph (A) of rule
3745-65-91
of the Administrative Code is no longer satisfied, the owner or operator shall
immediately modify the number, location, or depth of the monitoring
wells to bring the ground water monitoring system
into compliance with this requirement.
Notes
Promulgated Under: 119.03
Statutory Authority: 3734.12
Rule Amplifies: 3734.12
Prior Effective Dates: 04/15/1981, 01/07/1983, 01/30/1986, 11/13/1987, 12/30/1989, 04/01/1990, 03/13/2002, 09/05/2010, 03/24/2017
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