Section NR 720.10 - Procedures for determining residual contaminant levels based on protection of groundwater(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:(a) A contaminant transport and fate model.(b) Leaching tests appropriate for the site or facility in both application and extent.(c) Any other appropriate method approved by the department for that specific site or facility, or other appropriate method suggested in department guidance.Wis. Admin. Code Department of Natural Resources § NR 720.10
CR 12-023: cr. Register October 2013 No. 694, eff. 11-1-13. 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.