118.01.22.1103. Monitoring Well Construction
AR ADC 118.01.22.1103Arkansas Administrative CodeEffective: December 25, 2021
Effective: December 25, 2021
Ark. Admin. Code 118.01.22.1103
Formerly cited as AR ADC 014.03.4-11
118.01.22.1103. Monitoring Well Construction
(a) Monitor Well Construction -- Monitor wells shall be constructed of materials which are resistant to chemical and physical degradation, which will not interfere with ground water quality, and which meet the requirements of Section 5.7 of Solid Waste Disposal Facility Criteria, Technical Manual, EPA 530-R-93-017, November 1993 or ASTM D 5092-90 Design and Installation of Ground Water Monitoring Wells in Aquifers. Alternate methods of well construction, installation or development must be specifically approved by the Solid Waste Management Division. Following construction, each well shall be developed to the degree necessary to restore formation hydraulic conductivity and insure low turbidity samples which are representative of formation ground water quality.
Prior to sampling, turbidity values shall be allowed to stabilize to a level, which is representative of ambient water quality in the formation. If during background or routine sampling, the turbidity values consistently remain above 10 NTU's, a qualified groundwater scientist shall evaluate the integrity of the well, redevelop the well if necessary and/or provide written justification the turbidity values present in the samples are representative of ambient water quality in the formation. If the justification provided by the Permittee for the observed turbidity values is not considered valid, and/or if the well cannot be effectively redeveloped to reduce turbidity values below 10 NTU's, and/or if the well is found to be unreliable for generating representative water quality samples, it must be replaced prior to the next scheduled sampling event.
(c) Well Casings -- Monitoring wells must be cased in a manner that maintains the integrity of the monitoring well bore hole. This casing must be screened or perforated and packed with gravel or sand, where necessary, to enable collection of ground water samples. The annular space (i.e., the space between the bore hole and well casing) above the sampling depth must be sealed to prevent contamination of samples and the ground water. Completed well casings should extend approximately three feet above natural grade and must have an anodized aluminum or rust proof external protective casing with a locking lid.
(f) Division Approval -- No monitor well or piezometer shall be installed, decommissioned, replaced, repaired or otherwise altered without prior approval by the Solid Waste Management Division. Upon completion of a well installation, replacement, decommissioning, repair or alteration, a report shall be made to the Solid Waste Management Division and a copy placed in the facility operating record. The work quality and methods must be certified by the supervising professional.
Credits
Amended Dec. 25, 2021.
Current with amendments received through February 15, 2024. Some sections may be more current, see credit for details.
Ark. Admin. Code 118.01.22.1103, AR ADC 118.01.22.1103
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