NR 206.08(1)(b)4.4. If an absorption pond system has been granted an exemption to groundwater quality standards under s. NR 140.28, the discharge requirements for nitrogen, total dissolved solids and chloride will be determined by the department on a case-by-case basis. Information to be considered in approving alternate limitations shall include: NR 206.08(1)(b)4.e.e. Expected increase in the concentration of a pollutant in groundwater downgradient at the point of standards application. NR 206.08(1)(b)5.5. The department may approve alternative effluent limitations in accordance with s. NR 206.06 for total nitrogen, BOD5, hydraulic application rate, total dissolved solids and chlorides; and may require effluent limitations for additional substances on a case-by-case basis in order to protect and maintain groundwater quality as required in ch. NR 140. NR 206.08 NoteNote: The effluent limitations in par. (b) 3. have been established to provide compliance with the groundwater enforcement standards for nitrate, total dissolved solids and chloride. The department has determined that it is not technically and economically feasible for absorption pond systems to comply with the preventive action limits for these substances. These effluent limitations, in combination with groundwater monitoring requirements, will assist the department in minimizing the levels of nitrate, total dissolved solids and chloride in the groundwater, to the extent technically and economically feasible. Groundwater enforcement standards and preventive action limits are specified in ss. NR 140.10 and 140.12. NR 206.08(2)(b)1.1. Discharge shall be limited to prevent any runoff of effluent from the site. Wastewater may not be sprayed during any rainfall event that causes runoff from the site. Uncontaminated storm water may be allowed to drain from a spray irrigation field. NR 206.08(2)(b)2.2. The volume of discharge shall be limited to prevent ponding, except for temporary conditions following rainfall events. NR 206.08(2)(b)4.4. The department may limit the fecal coliform bacteria in the discharge to the spray irrigation system based on the potential impact to public health. NR 206.08(2)(b)5.5. The hydraulic application rate for each system shall be based on hydrogeologic conditions, soil texture, permeability, cation exchange capacity, topography, cover crop and wastewater characteristics. The average hydraulic application rate may not exceed 10,000 gallons per acre per day. NR 206.08 NoteNote: Based upon the department’s experience, the recommended range for the average hydraulic application rate is 2,000 to 7,000 gallons per acre per day, based on a monthly average.
NR 206.08(2)(b)6.6. The annual nitrogen application rate shall be limited to the nitrogen needs of the cover crop plus demonstrable denitrification occurring in the treatment system. Determination of the annual nitrogen application rate shall include the nitrogen supplied by the wastewater and any supplemental fertilizers used. NR 206.08(2)(b)7.7. The soil at each individual spray irrigation field shall be tested annually for nitrogen, available phosphorus, available potassium and pH. The results of these analyses shall be submitted to the department and used to manage the spray irrigation system. NR 206.08(2)(b)8.8. The department may limit additional parameters as necessary to protect and maintain groundwater quality as required in ch. NR 140. NR 206.08(3)(b)1.1. Discharge to a ridge and furrow system shall be limited so that the discharge and precipitation from a 10-year frequency, 24-hour duration rainfall event does not overflow the boundary of the system. NR 206.08(3)(b)2.2. The discharge shall be alternately distributed to individual sections of the disposal system to allow sufficient resting periods to maintain the treatment capability of the soil. NR 206.08(3)(b)4.4. The volume of discharge shall be limited to prevent inundation of the ridges except for temporary conditions following precipitation events. NR 206.08(3)(b)5.5. The average hydraulic application rate may not exceed 10,000 gallons per acre per day for the system. NR 206.08 NoteNote: Based upon the department’s experience, the recommended range for the average hydraulic application rate is 2,000 to 5,000 gallons per acre per day based on a monthly average.
NR 206.08(3)(b)6.6. The annual total nitrogen in the wastewater applied to the system shall be limited to the annual nitrogen need of the cover crop plus demonstrable denitrification occurring in the treatment system. NR 206.08(3)(b)7.7. The department may limit additional parameters as necessary to protect and maintain groundwater quality as required in ch. NR 140. NR 206.08(4)(b)1.1. The discharge to the overland flow system shall be alternately distributed to individual sections of the system in a regular load/rest cycle that allows sufficient resting to dry accumulated solids and maintain a complete grass cover. NR 206.08(4)(b)2.2. The hydraulic application rate shall be as defined in the management plan, developed according to s. NR 206.07 (2) (h). The hydraulic application rate is expressed as a flow rate per unit width of slope. NR 206.08(4)(b)3.3. Hydraulic application rates shall be reduced substantially when the vegetative cover has not developed sufficiently to anchor the soil and create the filter mat necessary for effective wastewater treatment. This condition may occur during original or springtime system startup. NR 206.08(4)(b)4.4. The discharge of wastewater to an overland flow system shall be in accordance with a WPDES permit. NR 206.08(4)(b)5.5. The department may limit parameters to an overland flow system in order to protect and maintain groundwater quality as required in ch. NR 140. NR 206.08(5)(5) All other land disposal systems shall be evaluated by the department on a case-by-case basis. NR 206.08 HistoryHistory: Cr. Register, March, 1985, No. 351, eff. 4-1-85; r. and recr. Register, November, 1990, No. 419, eff. 12-1-90. NR 206.09NR 206.09 Wastewater monitoring requirements. NR 206.09(1)(1) Discharges to land disposal systems, except for large scale soil absorption systems, shall be monitored for total daily flow and at least monthly for total dissolved solids, chlorides, BOD5, organic nitrogen, ammonia-nitrogen and nitrate plus nitrite nitrogen. For spray irrigation systems, fecal coliform bacteria monitoring may be included on a case-by-case basis. For large scale soil absorption systems, effluent shall be monitored for total daily flow, and at least quarterly for BOD5, organic nitrogen, ammonia nitrogen, total dissolved solids and chlorides. The frequency of flow monitoring and sampling and the type of samples shall be as specified in the WPDES. NR 206.09(2)(2) Influent to all treatment facilities subject to the monitoring provisions of sub. (1) shall be monitored for total daily flow, and at least monthly for BOD5 and organic nitrogen and ammonia-nitrogen. The frequency of flow monitoring and sampling and the type of samples shall be as specified in the WPDES permit. Any flow bypassing the treatment facility to the land disposal system shall be monitored at a minimum of once per bypass event for the parameters for which effluent monitoring is required or as determined by the department. Influent monitoring may be required on a case-by-case basis for large scale soil absorption systems. NR 206.09(3)(3) Monitoring for other pollutants parameters may be required on a case-by-case basis dependent on waste characteristics and their potential for groundwater contamination. NR 206.09(4)(4) Unless otherwise specified in the WPDES permit for a land disposal system: NR 206.09(4)(a)(a) The procedures for measuring flow and taking samples of discharges shall be those set forth in ch. NR 218. NR 206.09(4)(b)(b) The methods of analysis for substances contained in discharges shall be those set forth in ch. NR 219. NR 206.09(4)(c)(c) Sample analysis used for permit reporting shall be performed by a laboratory certified under ch. NR 149. NR 206.09 HistoryHistory: Cr. Register, March, 1985, No. 351, eff. 4-1-85; r. and recr. (1) and (2), cr. (4) (c), Register, November, 1990, No. 419, eff. 12-1-90. NR 206.10(1)(1) Design criteria. The design criteria and construction standards for a groundwater monitoring well shall conform to s. NR 110.25 (5) and ch. NR 141. NR 206.10(2)(a)(a) Approval of plans and specifications for groundwater monitoring wells installed after the treatment facility has been constructed is required for any well which is to be used as a permanent groundwater monitoring well. NR 206.10(2)(b)(b) If wells were installed prior to treatment facility construction, department approval for use of these wells as permanent groundwater monitoring wells is required and is conditional, based on documentation that the wells were constructed in conformance with ch. NR 141. NR 206.10(3)(a)(a) For systems approved on or before December 1, 1990, monitoring requirements shall be based on average daily flow. NR 206.10(3)(b)(b) For systems modified or approved after December 1, 1990, monitoring requirements shall be based on average daily flow. NR 206.10(3)(c)(c) If the system has a design or average daily flow less than 0.015 MGD, the department may require groundwater monitoring if there is reason to believe contamination of groundwater is occurring. NR 206.10(3)(d)(d) If the system has a design or average daily flow equal to or greater than 0.015 MGD, groundwater shall be monitored at a minimum of one level, at locations specified in the permit, and may include monitoring at more than one level. The department may waive this requirement on a case-by-case basis. Criteria which will be evaluated to waive this requirement include degree of treatment of the effluent, depth to groundwater and bedrock, nature of the bedrock, soil permeability, directions and rate of groundwater flow, vertical and horizontal flow gradients, existing groundwater quality, downgradient uses of the groundwater and compliance with ch. NR 140 standards. NR 206.10(3)(e)(e) Groundwater elevation within the land disposal system shall be monitored through the use of a water table observation well for all land disposal systems that have a depth to groundwater from cell bottom of less than 5 feet. NR 206.10(4)(a)(a) For systems where background water quality has been established, the groundwater sampling frequency shall be quarterly. NR 206.10(4)(b)(b) For systems where background water quality has not been established, the groundwater sampling frequency shall be every 6 to 7 weeks until 8 representative samples have been obtained, and shall be quarterly thereafter. NR 206.10(4)(c)(c) The department may modify the sampling frequency on a case-by-case basis. NR 206.10(5)(a)(a) The department may require groundwater monitoring for any or all of the following parameters in filtered or unfiltered samples: elevation, BOD5, field specific conductance, COD, organic nitrogen, ammonia nitrogen, nitrate plus nitrite nitrogen, chlorides, sulfates, total dissolved solids, alkalinity, hardness, temperature and pH. NR 206.10(5)(b)(b) Monitoring for other parameters may be required on a case-by-case basis if there is reason to believe contamination is occurring or if these contaminants are present in the wastewater, to determine compliance with the groundwater quality standards in ch. NR 140. NR 206.10(6)(6) Sampling procedures. Groundwater sampling procedures shall comply with the methods contained in s. NR 140.16. NR 206.10(7)(a)(a) The methods of analysis for substances contained in groundwater samples shall be those in ch. NR 219. NR 206.10(7)(b)(b) Sample analysis used for permit reporting shall be performed by a laboratory certified or registered under ch. NR 149. NR 206.10 HistoryHistory: Cr. Register, March, 1985, No. 351, eff. 4-1-85; r. and recr. Register, November, 1990, No. 419, eff. 12-1-90.
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Chs. NR 200-299; Environmental Protection – Wisconsin Pollutant Discharge Elimination System
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