Wisconsin Administrative Code
Department of Natural Resources
NR 500-599 - Environmental Protection - Solid Waste Management
Chapter NR 512 - Feasibility Reports For Landfills
Section NR 512.10 - Subsurface data analysis

Universal Citation: WI Admin Code ยง NR 512.10

Current through August 26, 2024

(1) At a minimum, the data on subsurface investigations shall be presented in the narrative section of the report and shall include the following specified requirements unless an alternative geotechnical investigation program under s. NR 512.085 specifically addressing these requirements, or a portion thereof, was accepted in writing by the department before the geotechnical investigation program for the feasibility report was initiated. Should the applicant identify minor discrepancies between the following specified requirements and the content of the feasibility report prior to its submittal to the department, the applicant may choose to identify those minor discrepancies in a separate letter to the department, including an explanation for them, and either propose a time table for providing that information or justify why it is not necessary to submit that specific information and request the necessary exemptions. The department shall respond to a letter in writing either accepting the explanation and requested approach or indicating that the discrepancies need to be addressed prior to issuing feasibility completeness.

(2) SOIL AND BEDROCK DESCRIPTIONS. Each major soil unit and bedrock formation shall be described using data from both subsurface investigations and regional information. The descriptions shall include:

(a) Grain size distribution, geologic origin and classification of materials using the USCS system.

(b) The lateral and vertical extent of each major soil unit including description of lenses or other heterogeneities and, if bedrock is encountered by borings, the strike and dip of any rock formations. Strike and dip may be determined from regional or site-specific information.

(c) The presence and frequency of joints, fractures, voids, solution openings, faults or other structural features.

(d) Testing data shall be summarized by major soil unit in a table in the report. The table shall contain the following information: geologic origin, sample ID number, percentages of gravel, sand, silt and clay-sized materials, P200 content, liquid limit, plasticity index, and lab and field hydraulic conductivity. If average values are calculated for any of these test results, a range and standard deviation shall also be presented.

(3) HYDROGEOLOGIC PROPERTIES. The properties of each saturated soil unit or rock formation and its function in the groundwater flow system shall be described including the following:

(a) Hydraulic conductivity.

(b) Role as a confining unit.

(c) Hydraulic connection to other units.

(d) Actual or potential use as a water supply.

(e) Depth to groundwater and seasonal variations in groundwater elevation.

(f) Location and extent of perched groundwater.

(g) Local and regional flow directions including the location of groundwater divides.

(h) Horizontal and vertical hydraulic gradients, particularly between soil units of differing hydraulic conductivity and between unconsolidated deposits and bedrock.

(4) APPENDIX. All raw data including boring logs, soil tests, hydraulic conductivity tests, water level measurements, baseline water quality laboratory reports, and department well construction, well development, and well information forms shall be included in the appendices of the report.

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