NR 708.09(1)(e)(e) Weather conditions at the site or facility, such as any precipitation that may have accelerated the migration of the contamination, from the time of the discharge until the response was completed. NR 708.09(1)(f)(f) Migration potential of the contamination, including soil conditions, proximity to surface water bodies, location of drains or storm sewers, depth to groundwater and the integrity of any containment area. NR 708.09(1)(m)(m) Whether or not routes of exposure are protective and the environment has been restored to the extent practicable. NR 708.09(1)(n)(n) Any other information that the department considers relevant. NR 708.09(2)(2) Site investigation. The department shall require responsible parties to conduct a site investigation in accordance with the requirements of ch. NR 716 if a hazardous substance discharge meets any of the following conditions: NR 708.09(2)(a)(a) There is evidence that groundwater wells have been affected by a discharge of a hazardous substance. NR 708.09(2)(c)(c) There is evidence that contaminated soils may be in contact with groundwater. NR 708.09(3)(3) Reopening a case. The department may require that additional response actions be conducted by responsible parties in compliance with the requirements of chs. NR 700 to 754 if additional information indicates that residual contamination at a site or facility poses a threat to public health, safety, or welfare or the environment. NR 708.09 NoteNote: Although the department may determine at this time that no further response action is necessary pursuant to chs. NR 700 to 754, the site, facility or portion of the site or facility may be subject to the regulations and requirements of other department programs. NR 708.09 HistoryHistory: Cr. Register, April, 1994, No. 460, eff. 5-1-94; r. and recr. (1) (intro.), Register, March, 1995, No. 471, eff. 4-1-95; am. (2) (a), Register, February, 1997, No. 494, eff. 3-1-97; CR 12-023: am. (2) (intro.), (a), (3) Register October 2013 No. 694, eff. 11-1-13. NR 708.11(1)(a)(a) Responsible parties shall evaluate the need for interim action prior to initiating a site investigation and during a site investigation. Interim action shall be taken where it is necessary to contain or stabilize a discharge of a hazardous substance or environmental pollution, in order to minimize any threat to public health, safety, or welfare or the environment. When an interim action is warranted, responsible parties shall implement an interim action as soon as facility or site- related information makes it possible to do so, in compliance with the requirements of this chapter. NR 708.11 NoteNote: The principal distinction between a non–emergency immediate action and an interim action is that a site investigation will generally be required in conjunction with an interim action, but not with a non–emergency immediate action. In addition, interim actions will be closed out using the criteria in ch. NR 726, not the “no further action” criteria in s. NR 708.09. NR 708.11(1)(b)(b) The department may require the use of a vapor mitigation system, or other engineering control, when vapor concentrations beneath a slab, foundation, or building exceed a vapor risk screening level. NR 708.11(2)(2) Specific actions. Interim actions may include any of the following: NR 708.11(2)(b)(b) Conducting source removal, such as excavation and treatment of highly contaminated soils, to prevent or limit further movement of the contamination. NR 708.11(2)(c)(c) Extracting free product, leachate or groundwater to restrict migration of a contaminant plume. NR 708.11(2)(d)(d) Constructing a temporary engineering control, such as a low permeability cover, or installing and operating a vapor mitigation system. NR 708.11(3)(3) Selection of interim actions. Unless otherwise directed by the department, responsible parties shall select and implement necessary interim action without prior department approval. The interim action selected by responsible parties shall comply with all of the following requirements: