Indiana Administrative Code
Title 329 - SOLID WASTE MANAGEMENT DIVISION
Article 10 - SOLID WASTE LAND DISPOSAL FACILITIES
Rule 15 - Municipal Solid Waste Landfills; Plans and Documentation to be Submitted with Permit Application
Section 15-5 - Description of proposed ground water monitoring well system
Universal Citation: 329 IN Admin Code 15-5
Current through September 18, 2024
Authority: IC 13-14-8-7; IC 13-15; IC 13-19-3
Affected: IC 13-20; IC 36-9-30
Sec. 5.
(a) The hydrogeologic site investigation report that accompanies permit applications for new MSWLFs and lateral expansions must contain a description of the proposed ground water monitoring well system that, at a minimum, includes the following information:
(1) Monitoring point
locations, design, and installation procedures. Installation procedures must
comply with
329
IAC 10-21-4.
(2) A thorough evaluation of the suitability
of any existing monitoring points proposed for inclusion in the ground water
monitoring well system.
(3) An
explanation of how the proposed ground water monitoring well system addresses
the hydrogeologic conditions identified within the uppermost aquifer system and
any significant zones of saturation that exist above the uppermost aquifer
system.
(4) A description of how
and where ground water monitoring wells will be installed at appropriate
locations and depths, to yield ground water samples from the uppermost aquifer
and any significant zones of saturation that exist above the uppermost aquifer
system. Ground water samples must represent both the quality of background
ground water that has not been affected by the proposed MSWLF unit and quality
of ground water quality passing the monitoring boundary of the proposed MSWLF
unit.
(5) A description of how
background ground water monitoring wells will monitor the same hydrologic units
as the downgradient ground water monitoring wells.
(6) If a single monitoring well cannot
adequately intercept and monitor the vertical extent of a potential pathway of
contaminant migration at a sampling location, a description of how a ground
water monitoring well cluster will be installed.
(7) For the uppermost aquifer system, a
description of how ground water monitoring well spacing will not exceed five
hundred (500) feet along the monitoring boundary of the proposed MSWLF unit. In
geologically complex environments as determined by the commissioner, closer
monitoring well spacing may be required. Alternate spacing of ground water
monitoring wells may be approved by the commissioner based on particular site
or facility conditions. Monitoring well spacing must provide at least two (2)
background ground water monitoring wells and four (4) downgradient monitoring
wells or well clusters within the uppermost aquifer system and any significant
zones of saturation that exist above the uppermost aquifer system. An alternate
number of background wells may be approved by the commissioner based on
particular site or facility conditions.
(b) The commissioner may consider an individual compliance ground water monitoring well system for intrawell statistical comparison methods if the permittee can demonstrate either of the following:
(1) The uppermost aquifer system,
and any significant zones of saturation that exist above the uppermost aquifer
system are discontinuous.
(2)
Significant spatial variability exists within the aquifer.
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