Authority: IC
13-14-8-7; IC
13-15-2-1;
IC
13-19-3-1
Sec. 4.
(a) An
application for restricted waste site Type I or Type II or nonmunicipal solid
waste landfill must be accompanied by a proposal for the installation of
monitoring devices, upgradient and downgradient from the landfill with respect
to ground water flow direction. The proposal must consist of a hydrogeologic
study that provides the information specified in subsection (b). The
commissioner may modify the requirements for the proposal dependent on site
characteristics. The proposal must be certified by a registered professional
engineer or licensed professional geologist, either of whom shall have
education or professional experience in hydrogeology or hydrology.
(b) The proposal must provide the following
information by means of maps, diagrams, and narrative:
(1) Summary of regional and site-specific
geologic information obtained from recent or previous soil borings, coal
borings, area ground water monitoring well logs, and published
reports.
(2) Water table and
potentiometric surface maps of the proposed site, including ground water flow
directions as follows:
(A) Such maps must be
prepared from data from cased holes or piezometers capable of measuring
hydraulic head at a maximum screen interval of five (5) feet. This limitation
on the maximum length of the screened interval must not apply to those
piezometers used to determine a water table surface. At least:
(i) three (3) such devices must be necessary
for fill areas less than twenty (20) acres;
(ii) four (4) such devices for fill areas
between twenty (20) and fifty (50) acres;
(iii) five (5) such devices for fill areas
between fifty (50) and ninety (90) acres; and
(iv) six (6) such devices for fill areas
greater than ninety (90) acres. The required devices must be evenly distributed
over the site. In addition, vertical hydraulic gradients must be measured, at a
minimum, of two (2) separate points at the site. Additional nested piezometers
or ground water monitoring wells may be required by the commissioner to
adequately determine vertical components. When more than one (1) aquifer is
present within the specified boring depths required in section 3(1)(C) of this
rule, individual water table and potentiometric maps may be required.
(B) Monthly water level
measurements over a period of at least six (6) months, along with water table
and potentiometric surface maps constructed from each measurement event, must
be submitted to the commissioner prior to operation of the facility.
(C) The proposal must discuss the evidence
and potential of significant components of vertical ground water flow. If there
are significant components of vertical flow, cross-sectional representations of
equipotential lines and ground water flow direction must be provided that
adequately represent the flow beneath the site.
(3) Identification of aquifers below the
proposed site to the depth required by section 3(1)(C) of this rule, including
the following information:
(A) Aquifer
thickness or thicknesses.
(B)
Lithology.
(C) Estimated hydraulic
conductivity and effective porosity.
(D) Presence of low permeability units above
or below.
(E) Whether the aquifers
are confined or unconfined.
In addition, a general identification and description must be
provided for aquifers known to exist from the geologic literature and area
ground water monitoring well logs.
(4) Known or projected information on
hydraulic connections of ground water to surface water and hydraulic
connections between different aquifers at site.
(5) Information on the current and proposed
use of ground water in the area, including any available information on
existing quality of ground water in the aquifer or aquifers.
(6) Diagrammatic representation of proposed
ground water monitoring well design and construction, including any available
information on existing quality of ground water in the aquifer or
aquifers.
(7) Proposed ground water
monitoring well locations, including length and elevation of screened
intervals.
(c) The
commissioner may require that pumping tests or similar hydraulic tests be
performed to provide a more accurate determination of aquifer characteristics
where necessary to determine the adequacy of site or monitoring system design.
