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118.01.22.1202. Ground Water Monitoring Systems

AR ADC 118.01.22.1202Arkansas Administrative CodeEffective: December 25, 2021

West's Arkansas Administrative Code
Title 118. Department of Energy and Environment
Division 01. Arkansas Pollution Control and Ecology Commission
Rule 22. Rule NO. 22: Solid Waste Management Rules
Chapter 12. Ground Water Monitoring and Corrective Action
Effective: December 25, 2021
Ark. Admin. Code 118.01.22.1202
Formerly cited as AR ADC 014.03.4-12
118.01.22.1202. Ground Water Monitoring Systems
Currentness
(a) Applicability -- As provided in Rule 22.1201(a), a ground water monitoring system must be installed that consists of a sufficient number of wells, installed at appropriate locations and depths, to yield ground-water samples from the uppermost aquifer (as defined in. [FN1] Rule 22.102) that:
(1) Represent the quality of background ground water that has not been affected by leakage from a unit. A determination of background quality may include sampling of wells that are not hydraulically up gradient of the waste management area where:
(i) Hydrogeologic conditions do not allow the owner or operator to determine what wells are hydraulically up gradient; or
(ii) Sampling at other wells will provide an indication of background ground water quality that is as representative or more representative than that provided by the upgradient wells; and
(2) Represent the quality of ground water passing the relevant point of compliance specified by Director under Rule 22.424(d). The downgradient monitoring system must be installed at the relevant point of compliance specified by the Director under Rule 22.424(d) that ensures detection of ground water contamination in the uppermost aquifer. When physical obstacles preclude installation of ground water monitoring wells at the relevant point of compliance at existing units, the downgradient monitoring system may be installed at the closest practicable distance hydraulically downgradient from the relevant point of compliance specified by the Director under Rule 22.424(d) that ensures detection of ground water contamination in the uppermost aquifer.
(b) Multi-Unit Monitoring -- The Director may approve a multi-unit ground water monitoring system instead of separate ground water monitoring systems for each landfill when the facility has several units, provided the multi-unit ground water monitoring system meets the requirement of Rule 22.1201 and will be as protective of human health and the environment as individual monitoring systems for each landfill, based on the following factors:
(1) Number, spacing, and orientation of the landfill units;
(2) Hydrogeologic setting;
(3) Site history;
(4) Engineering design of the landfills, and
(5) Type of waste accepted at the landfills.
(c) Well Construction and Decommissioning Requirements -- Monitoring wells must be constructed in accordance with Rule 22.1103.
(1) The owner or operator must notify the Director that the design, installation, development, and decommission of any monitoring wells, piezometers and other measurement, sampling, and analytical devices documentation has been placed in the operating record; and
(2) The monitoring wells, piezometers, and other measurement, sampling, and analytical devices must be operated and maintained so that they perform to design specifications throughout the life of the monitoring program.
(d) Site-Specific Design -- The number, spacing, and depths of monitoring systems shall be determined based upon site-specific technical information developed in accordance with the requirements of Chapter 11 that must include thorough characterization of:
(1) Aquifer thickness, ground-water flow rate, ground-water flow direction including seasonal and temporal fluctuations in ground-water flow; and
(2) Saturated and unsaturated geologic units and fill materials overlying the uppermost aquifer, materials comprising the uppermost aquifer, and materials comprising the confining unit defining the lower boundary of the uppermost aquifer; including, but not limited to: thicknesses, stratigraphy, lithology, hydraulic conductivities, porosities and effective porosities.
(e) Certification -- The ground water monitoring system must be certified by a qualified ground water scientist or approved by the Director. Within fourteen (14) days of this certification, the owner or operator must notify the Director that the certification has been placed in the operating record.

Credits

Amended Dec. 25, 2021.
[FN1]
So in original.
Current with amendments received through May 15, 2024. Some sections may be more current, see credit for details.
Ark. Admin. Code 118.01.22.1202, AR ADC 118.01.22.1202
End of Document