Wisconsin Administrative Code
Department of Natural Resources
NR 700-799 - Environmental Protection - Investigation and Remediation of Environmental Contamination
Chapter NR 720 - Soil cleanup standards
Section NR 720.10 - Procedures for determining residual contaminant levels based on protection of groundwater
Current through August 26, 2024
(1) GENERAL. If a responsible party selects this option, residual contaminant levels for soil based on protection of groundwater shall be developed using the enforcement standards established in ch. NR 140 or using procedures consistent with the methodology in ss. 160.13 and 160.15, Stats., and the criteria in s. NR 722.09(2) (b) 2. when there is no enforcement standard as the target concentrations in groundwater. If the department of health has not developed a recommended enforcement standard and a federal maximum contaminant level exists, that value may be used for calculating a soil residual contaminant level.
Note: In developing a residual contaminant level, any relevant information may be considered, including public welfare concerns for groundwater, such as taste and odor, and drinking water health advisory levels.
(2)METHODS. Responsible parties shall use one or more of the methods listed in this section based on scientifically valid procedures that are subject to department review and approval and site-specific geological, physical and chemical conditions to establish residual contaminant levels:
Guidance document RR-890 provides detailed instructions on one method the department considers scientifically valid for purposes of calculating site specific residual contaminant levels that are protective of groundwater quality. A table of residual contaminant levels that are calculated using the standard default exposure assumptions can be found at: http://dnr.wi.gov/topic/Brownfields/professionals.html#tabx2.
