Indiana Administrative Code › Title 329 - SOLID WASTE MANAGEMENT DIVISION › Article 10 - SOLID WASTE LAND DISPOSAL FACILITIES › Rule 24 - Restricted Waste Sites Type I and Type II and Nonmunicipal Solid Waste Landfills; Additional Application Requirements to 329 IAC 10-11 › Section 24-4 - Hydrogeologic study

Current through July 10, 2024
Authority: IC
				  13-14-8-7; IC
				  13-15-2-1;
				  IC
				  13-19-3-1
Affected: IC
				  13-30-2; IC
				  36-9-30
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.