Chapter NR 508
RESPONSES WHEN A GROUNDWATER STANDARD
IS ATTAINED OR EXCEEDED
NR 508.04 Responses when a groundwater standard is attained or exceeded at any groundwater monitoring well. NR 508.05 Responses when a groundwater standard is attained or exceeded at a Subtitle D well. NR 508.06 Responses when a groundwater standard is attained or exceeded at a CCR well. Ch. NR 508 NoteNote: Chapter NR 508 as it existed on June 30, 1996 was repealed and a new chapter NR 508 was created effective July 1, 1996. Corrections made under s. 13.93 (2m) (b) 7., Register, August, 1997, No. 500. NR 508.01NR 508.01 Purpose. The purpose of this chapter is to establish procedures for responding to a groundwater standard that is attained or exceeded at any groundwater monitoring well at a solid waste facility and for conducting assessment monitoring at Subtitle D wells and CCR wells. This chapter is adopted under ch. 289, Stats., and s. 227.11, Stats. NR 508.01 HistoryHistory: Cr. Register, June, 1996, No. 486, eff. 7-1-96; CR 21-076: am. Register July 2022 No. 799, eff. 8-1-22. NR 508.02(1)(a)(a) Except as provided in par. (b) and except as otherwise provided, this chapter governs all environmental monitoring for solid waste disposal facilities as defined under s. 289.01 (35), Stats., including all CCR landfills and expansions. NR 508.02(2)(2) This chapter does not apply to the design, construction or operation of industrial wastewater facilities, sewerage systems and waterworks treating liquid wastes approved under s. 281.41, Stats., or permitted under ch. 283, Stats., nor to facilities used solely for the disposal of liquid municipal or industrial wastes which have been approved under s. 281.41, Stats., or permitted under ch. 283, Stats., except for facilities used for the disposal of solid waste. NR 508.02 HistoryHistory: Cr., Register, June, 1996, No. 486, eff. 7-1-96; correction in (1) made under s. 13.93 (2m) (b) 7., Stats., Register March 2003 No. 567; correction in (1) made under s. 13.93 (2m) (b) 7., Stats., Register April 2013 No. 688; CR 13-057: am. (1) Register July 2015 No. 715, eff. 8-1-15; CR 21-076: renum. (1) to (1) (a) and (b) 1. to 3. and am., cr. (1) (b) (intro.) Register July 2022 No. 799, eff. 8-1-22. NR 508.03NR 508.03 Definitions. The terms used in this chapter are defined in s. NR 500.03. NR 508.03 HistoryHistory: Cr., Register, June, 1996, No. 486, eff. 7-1-96. NR 508.04NR 508.04 Responses when a groundwater standard is attained or exceeded at any groundwater monitoring well. If a PAL, ACL or ES is attained or exceeded at any groundwater monitoring well according to s. NR 140.14 and the value is confirmed, the owner or operator shall comply with subs. (1) and (2) and may be required, either by the department or under s. NR 508.05 (5), to comply with subs. (3) and (4). NR 508.04(3)(3) If required by the department, the owner or operator shall develop a site investigation workplan and a site investigation report in accordance with ss. NR 716.05 to 716.11 and 716.15 to 716.17. If a site investigation report is submitted under s. NR 716.15, it shall include proof of financial responsibility to comply with s. NR 520.05 (1). NR 508.04(4)(4) If required by the department, the owner or operator shall evaluate and select remedial action options and develop a remedial action options report in accordance with ch. NR 722. Any soil contamination shall be addressed in accordance with the requirements of ch. NR 720. NR 508.04(5)(5) If the owner or operator implements remedial action, the department shall determine whether the remedial action has met the requirements of ch. NR 140 in accordance with ch. NR 726. NR 508.04 NoteNote: For the purpose of this chapter, the department considers a value to be confirmed if a follow up field sample attains or exceeds the groundwater standard.
NR 508.04 NoteNote: Section NR 140.14 (3) addresses exceedances for analytical results that fall between the limit of detection and the limit of quantitation. NR 508.04 HistoryHistory: Cr. Register, June, 1996, No. 486, eff. 7-1-96. NR 508.05NR 508.05 Responses when a groundwater standard is attained or exceeded at a Subtitle D well. If a PAL, ACL or ES is attained or exceeded at a Subtitle D well and the value is confirmed, the owner or operator shall continue detection monitoring in accordance with s. NR 507.19 and shall respond in accordance with s. NR 508.04 and the following requirements: NR 508.05(1)(1) The owner or operator may demonstrate that a reported value represents a false exceedance of a groundwater standard in accordance with s. NR 507.28 (3). If the department does not concur with the written demonstration within 30 days, the owner or operator shall begin assessment monitoring in accordance with this subsection. If the department concurs within 30 days after receipt of the demonstration, the owner or operator need not begin assessment monitoring. NR 508.05(2)(2) The department may approve an alternate assessment monitoring program if the only parameters which are at or above the groundwater standards are the inorganic detection monitoring parameters listed under municipal solid waste in ch. NR 507 Appendix I Table 1. NR 508.05(3)(3) The owner or operator shall conduct an assessment monitoring program in accordance with all of the following requirements: NR 508.05(3)(a)(a) The owner or operator shall collect and analyze assessment monitoring samples from all of the Subtitle D wells at the facility. The first set of assessment monitoring samples shall be collected during the first routine monitoring event following receipt of the groundwater standard exceedance. The first set of assessment monitoring samples shall be analyzed for the parameters determined under either subd. 1. or 2. or as approved by the department in writing: NR 508.05(3)(b)(b) Annually, the owner or operator shall sample and analyze the leachate for the parameters listed in ch. NR 507 Appendix II. Within 14 days after obtaining the leachate sampling results, the owner or operator shall place the results in the operating record. Within 60 days after the end of the sampling period, the owner or operator shall submit the leachate sampling results to the department. NR 508.05(3)(c)(c) Semiannually, the owner or operator shall sample the Subtitle D wells for all of the following: NR 508.05(3)(d)(d) All assessment monitoring samples being analyzed for metals shall be obtained using the low-flow sampling technique. NR 508.05(3m)(3m) The owner or operator may submit a written request to eliminate select parameters from the assessment monitoring program required under this section after 4 rounds of assessment monitoring have been collected and analyzed. The request shall demonstrate that these parameters were not detected in any of the 4 rounds. The department may approve eliminating any parameters that were not detected in the first 4 rounds or detected once but not confirmed in subsequent rounds. NR 508.05(4)(4) The owner or operator may submit a written request to cease the assessment monitoring program required under this section. The request shall demonstrate that 2 consecutive semi-annual sampling rounds show that all detected parameters in the groundwater samples from the Subtitle D wells are at or below groundwater standards listed in ch. NR 140 Tables 1 and 2, or PALs or ACLs established in accordance with s. NR 507.27. The department may approve the cessation of assessment monitoring if the only parameters which remain above the groundwater standards are the inorganic detection parameters listed under municipal solid waste in ch. NR 507 Appendix I Table 1. NR 508.05(5)(5) If an ES is attained or exceeded at a Subtitle D well and the value is confirmed, the owner or operator, in addition to s. NR 508.05 (intro.) and subs. (1) to (3), shall do all of the following: NR 508.05(5)(a)(a) Notify the clerk of each municipality within which the landfill is located and whose boundary is within 1,200 feet of the limits of filling of any sampling result which exceeds an enforcement standard. The owner or operator shall notify the clerk within 14 days of receiving the sample result. NR 508.05 NoteNote: For the purpose of this chapter, the department considers a value to be confirmed if a follow up field sample attains or exceeds the groundwater standard.
NR 508.05 HistoryHistory: Cr. Register, June, 1996, No. 486, eff. 7-1-96; CR 05-020: cr. (3m) Register January 2006 No. 601, eff. 2-1-06. NR 508.06NR 508.06 Responses when a groundwater standard is attained or exceeded at a CCR well. NR 508.06(1)(1) Notification and confirmation. If a PAL, ACL, or ES is attained or exceeded at a CCR well according to s. NR 140.14 and the value is confirmed, the owner or operator of the CCR landfill shall continue detection monitoring in accordance with s. NR 507.15 (3) (L) and shall respond in accordance with all of the following requirements: NR 508.06(1)(b)(b) The owner or operator shall determine whether a reported value has attained or exceeded a PAL or ES in accordance with s. NR 140.14 at the point of standards application and respond in accordance with s. NR 140.24 or 140.26. NR 508.06(1)(c)(c) The owner or operator may demonstrate that a reported value represents a false exceedance of a groundwater standard in accordance with s. NR 507.28 (3) and shall submit the demonstration within 60 days of the groundwater standard attainment or exceedance. If the department does not concur with the written demonstration within 30 days after receipt of the demonstration, the owner or operator shall begin assessment monitoring in accordance with sub. (2). If the department concurs within 30 days after receipt of the demonstration, the owner or operator is not required to begin assessment monitoring. The owner or operator shall include the demonstration in the annual groundwater monitoring and corrective action report. NR 508.06(2)(2) Assessment monitoring program. The owner or operator of a CCR landfill shall conduct an assessment monitoring program in accordance with all of the following requirements: NR 508.06(2)(a)(a) The owner or operator shall collect and analyze assessment monitoring samples from all of the CCR wells at the facility. The assessment monitoring samples shall be collected within 90 days of triggering an assessment monitoring program and annually thereafter. The owner or operator of the CCR landfill shall sample and analyze the groundwater for all constituents listed under ch. NR 507, Appendix I, Table 3 for CCR wells. The number of samples collected and analyzed for each well during each sampling event shall be consistent with the approved sampling plan and shall be no less than one sample from each well. NR 508.06(2)(b)(b) After obtaining the results from the initial assessment sampling event required under par. (a), the owner or operator shall, within 90 days of obtaining the results, and semiannually thereafter, resample all CCR wells, conduct analyses for all detection monitoring parameters under ch. NR 507, Appendix I, Table 1A and for those constituents under ch. NR 507, Appendix I, Table 3 that are detected in response to par. (a), and report the results to the department in accordance with s. NR 507.30 (1). The number of samples collected and analyzed for each CCR well during subsequent semiannual sampling events shall be consistent with the approved sampling plan and shall consist of a minimum of one sample from each well. NR 508.06(2)(c)(c) If the concentrations of all constituents sampled under par. (b) are shown to be at or below a PAL or ES under s. NR 140.10 or an approved ACL for two consecutive sampling events at the point of standards application, the owner or operator may return to detection monitoring of the CCR landfill. The owner or operator shall notify the department that detection monitoring is resuming for the CCR landfill within 60 days after the end of the sampling period. The notification shall be submitted to the department under s. NR 506.17 (4), placed in the written operating record under s. NR 506.17 (2) and posted on a publicly accessible internet site under s. NR 506.17 (3). NR 508.06(2)(d)(d) If the concentrations of any sampled parameter are above the PAL or ES standards in s. NR 140.10 or approved ACL at the point of standards application, the owner or operator shall continue assessment monitoring in accordance with this section. NR 508.06(2)(e)(e) If one or more constituents in the assessment monitoring are detected at levels above the groundwater protection standard under s. NR 140.10 in any sampling event, the owner or operator shall do all of the following: NR 508.06(2)(e)2.2. Characterize the nature and extent of the release and any relevant site conditions that may affect the remedy ultimately selected. The characterization shall include a complete and accurate assessment of the corrective measures necessary to effectively prevent and remediate all releases from the CCR landfill. NR 508.06(2)(e)3.3. Install additional monitoring wells necessary to define the contaminant plumes. NR 508.06(2)(e)4.4. Collect data on the nature and estimated volume of leachate including specific information on the constituents listed under ch. NR 507, Appendix I, Table 3 and the concentrations at which the constituents are present in the landfill leachate. NR 508.06(2)(e)5.5. Install at least one additional monitoring well at the property boundary in the direction of contaminant migration and sample this well in accordance with par. (b). NR 508.06(2)(e)6.6. Sample all wells in accordance with par. (b) to characterize the nature and extent of the release. NR 508.06(2)(e)7.7. Notify all property owners and residents on land that directly overlies any part of the plume of contamination if contaminants have migrated off-site as indicated by sampling of wells in accordance with subd. 6. The owner or operator shall provide the department with copies of the notifications within 60 days of their certified delivery to the affected property owners or residents.
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Department of Natural Resources (NR)
Chs. NR 500-599; Environmental Protection – Solid Waste Management
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