(1) By August 1,
1982, the owner or operator shall prepare an outline of a groundwater quality
assessment program. The outline shall describe a more comprehensive groundwater
monitoring program (than that described in ss.
NR 665.0091 and 665.0092) capable of determining all of
the following:
(a) Whether hazardous waste or
hazardous waste constituents have entered the groundwater.
(b) The rate and extent of migration of
hazardous waste or hazardous waste constituents in the groundwater.
(c) The concentrations of hazardous waste or
hazardous waste constituents in the groundwater.
(2) For each indicator parameter specified in
s.
NR 665.0092(2)
(c), the owner or operator shall calculate
the arithmetic mean and variance, based on at least 4 replicate measurements on
each sample, for each well monitored in accordance with s.
NR 665.0092(4)
(b), and compare these results with its
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 ch. NR 665 Appendix IV) to determine
statistically significant increases (and decreases, in the case of pH) over
initial background.
(3)
(a) If the comparisons for the upgradient
wells made under sub. (2) show a significant increase (or pH decrease), the
owner or operator shall submit this information in accordance with s.
NR 665.0094(1) (b)
2.
(b) If the comparisons for downgradient wells
made under sub. (2) show a significant increase (or pH decrease), the owner or
operator shall then immediately obtain additional groundwater samples from
those downgradient wells where a significant difference was detected, split the
samples in 2 and obtain analyses of all additional samples to determine whether
the significant difference was a result of laboratory error.
(4)
(a) If the analyses performed under sub. (3)
(b) confirm the significant increase (or pH decrease), the owner or operator
shall provide written notice to the department-within 7 days of the date of the
confirmation-that the facility may be affecting groundwater quality.
(b) Within 15 days after the notification
under par. (a), the owner or operator shall develop and submit to the
department a specific plan, based on the outline required under sub. (1) and
certified by a qualified geologist or geotechnical engineer, for a groundwater
quality assessment program at the facility. This plan shall be placed in the
facility's operating record and be maintained until closure of the
facility.
(c) The plan to be
submitted under s.
NR 665.0090(4) (a) or (b) shall specify
all of the following:
1. The number, location
and depth of wells.
2. Sampling and
analytical methods for those hazardous wastes or hazardous waste constituents
in the facility.
3. Evaluation
procedures, including any use of previously-gathered groundwater quality
information.
4. A schedule of
implementation.
(d) The
owner or operator shall implement the groundwater quality assessment plan which
satisfies the requirements of par. (c), and, at a minimum, determine all of the
following:
1. The rate and extent of migration
of the hazardous waste or hazardous waste constituents in the
groundwater.
2. The concentrations
of the hazardous waste or hazardous waste constituents in the
groundwater.
(e) The
owner or operator shall make the first determination under par. (d) as soon as
technically feasible, and, within 15 days after that determination, submit to
the department a written report containing an assessment of the groundwater
quality. This report shall be placed in the facility's operating record and be
maintained until closure of the facility.
(f) If the owner or operator determines,
based on the results of the first determination under par. (d), that no
hazardous waste or hazardous waste constituents from the facility have entered
the groundwater, then the owner or operator may reinstate the indicator
evaluation program described in s.
NR 665.0092
and sub. (2). If the owner or operator reinstates the indicator evaluation
program, the owner or operator shall so notify the department in the report
submitted under par. (e).
(g) If
the owner or operator determines, based on the first determination under par.
(d), that hazardous waste or hazardous waste constituents from the facility
have entered the groundwater, then the owner or operator:
1. Shall continue to make the determinations
required under par. (d) on a quarterly basis until final closure of the
facility, if the groundwater quality assessment plan was implemented prior to
final closure of the facility.
2.
May cease to make the determinations required under par. (d), if the
groundwater quality assessment plan was implemented during the long-term care
period.
(5)
Notwithstanding any other provision of this subchapter, any groundwater quality
assessment to satisfy the requirements of sub. (4) (d) which is initiated prior
to final closure of the facility shall be completed and reported in accordance
with sub. (4) (e).
(6) Unless the
groundwater is monitored to satisfy the requirements of sub. (4) (d), at least
annually the owner or operator shall evaluate the data on groundwater surface
elevations obtained under s.
NR 665.0092(5) to determine whether the
requirements under s.
NR 665.0091(1) for locating the
monitoring wells continues to be satisfied. If the evaluation shows that s.
NR 665.0091(1) is no longer satisfied,
the owner or operator shall immediately modify the number, location or depth of
the monitoring wells to bring the groundwater monitoring system into compliance
with s.
NR 665.0091(1).
