Section 132-7-002 - Ground Water Monitoring Systems002.01 An owner or operator shall install a ground water monitoring system that consists of a sufficient number of wells, installed at appropriate locations and depths, to yield ground water samples from the uppermost aquifer that: 002.01A Represent the quality of background ground water that has not been affected by leakage from an existing solid waste disposal area. A determination of background quality may include sampling of wells that are not hydraulically upgradient of the solid waste disposal area where: 002.01A1 Hydrogeologic conditions do not allow the owner or operator to determine what wells are hydraulically upgradient; or002.01A2 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; and002.01B Represent the quality of the ground water passing the relevant point of compliance specified by the Department under 003.04D of Chapter 3 and 003.04D of Chapter 4. 002.01B1 The downgradient monitoring systems shall be installed at the relevant point of compliance specified by the Department under these regulations that ensures detection of ground water contamination in the uppermost aquifer.002.01B2 When physical obstacles preclude installation of ground water monitoring wells at the relevant point of compliance at existing units, the downgradient monitoring systems may be installed at the closest practicable distance hydraulically downgradient from the relevant point of compliance specified by the Department under these regulations that ensures detection of ground water contamination in the uppermost aquifer.002.02 A multi-unit ground water monitoring system (rather than separate ground water monitoring systems for each landfill unit) may be approved when the facility has several units, provided the multi-unit ground water monitoring system: 002.02A Meets the requirements of 002.01 of this chapter; and002.02B Will be as protective of human health and the environment as individual ground water monitoring systems for each solid waste disposal area, based on the following factors: 002.02B1 Number, spacing, and orientation of the solid waste disposal area units;002.02B2 Hydrogeologic setting;002.02B4 Engineering design of the solid waste disposal area;002.02B5 Type of waste accepted at the solid waste disposal area.002.03 Ground water monitoring wells shall be cased in a manner that maintains the integrity of the monitoring well bore hole.002.03A This casing shall be screened or perforated and packed with sand or gravel, where necessary, to enable collection of ground water samples.002.03B The annular space (i.e., the space between the bore hole and well casing) above the sampling depth shall be sealed to prevent contamination of samples and the ground water.002.03C An owner or operator shall notify the Department that the design, installation, development, and decommission of any monitoring wells, piezometers and any other measurement, sampling, and analytical devices documentation has been placed in the operating record.002.03D The monitoring wells, piezometers, and other measurement, sampling, and analytical devices shall be operated and maintained so that they perform to design specifications throughout the life of the monitoring program.002.04 The number, spacing, and depths of the monitoring systems shall be:002.04A Determined based upon site-specific technical information that shall include thorough characterization of: 002.04A1 Aquifer thickness, ground water flow rate, ground water flow direction including seasonal and temporal fluctuations in ground water flow; and002.04A2 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: 002.04A2(a) Thickness, stratigraphy, lithology, hydraulic conductivities, porosities and effective porosities.002.04B Certified by a qualified ground water scientist and approved by Department.002.04B1 An owner or operator shall notify the Department that this certification has been placed in the record within fourteen (14) days of the certification.132 Neb. Admin. Code, ch. 7, § 002