NR 214.14(4)(b)(b) The department may require in a WPDES permit that the discharge be monitored for BOD5, total suspended solids, forms of nitrogen, chloride, metals or any other pollutant that may be present. The department shall select the pollutants to be monitored and the required frequency of monitoring on a case-by-case basis by considering the potential public health impacts, probable environmental impact, soil and geologic conditions, past operating performance, concentrations and characteristics of pollutants in the discharge and other relevant information.

NR 214.14(4)(c)(c) The department may require electronic or paper submittal of discharge monitoring reports and land application forms.

NR 214.14(5)(a)(a) Spray irrigation systems shall be operated in a load/rest cycle that will provide time for the soil organisms to biologically decompose the organic pollutants in the wastewater, for organic solids on the ground surface to decompose and for the soil column to reaerate.

NR 214.14(5)(b)(b) The spray irrigation system cover crop shall be cut and removed at least twice a year to stimulate growth of vegetation and removal of nutrients from the system. Corn or other crops may be harvested only once as long as the applied nutrients are limited accordingly.

NR 214.14(5)(c)(c) The soil at each individual spray irrigation field shall be tested annually for available nitrogen, available phosphorus, available potassium and pH. The results of these analyses shall be submitted to the department and used to determine if the nutrients applied to the site are meeting the agronomic needs of the cover crop.

NR 214.14(5)(d)(d) Management plan. The department shall require each spray irrigation system owner or operator to submit a management plan for optimizing treatment system performance and demonstrating compliance with the requirements of this chapter. Following approval by the department, the treatment system shall be operated in conformance with the management plan. If the facility wishes to operate differently than specified in the approved plan, a written request shall be submitted to the department for approval to amend the management plan. The plan shall specify information on pretreatment processes, load and rest schedules, scheduled maintenance, vegetative cover management and removal, scheduling of annual soil nutrient testing, operational strategies for periods of adverse weather, monitoring procedures and any other pertinent information.

NR 214.14(6)(6) Soil investigation and groundwater monitoring requirements. The soil investigation and groundwater monitoring requirements for spray irrigation systems are specified in ss. NR 214.20 and 214.21.

NR 214.15(1)(a)(a) An overland flow system shall be located at least 500 feet from the nearest inhabited dwelling, except that this distance may be reduced with the written consent of any affected owners and occupants. The department may require a greater distance depending on the type of system and potential for aesthetic and public health impacts.

NR 214.15(1)(b)(b) An overland flow system shall be located at least 1,000 feet from a well serving a community public water supply system and at least 250 feet from other potable water supply wells.

NR 214.15(1)(c)(c) The ground surface of the system shall have a minimum separation distance to bedrock and groundwater of at least 5 feet.

NR 214.15(1)(d)(d) The system may not be located in the floodway as specified in ch. NR 116. Any system located in the floodplain shall conform to ch. NR 116 and may not be operated when the floodplain is flooded.

NR 214.15(2)(a)(a) Overland flow systems shall be underlain by at least one foot of heavy textured soils such as clays or clay loams to retard leakage through the base.

NR 214.15(2)(b)(b) The downslope flow distance shall be 100 feet or greater.

NR 214.15(2)(c)(c) The downslope gradient for the overland flow fields shall be between 2% and 8%.

NR 214.15(2)(d)(d) The system shall consist of at least 2 cells of approximately equal area which can be alternately loaded and rested. Where self-propelled equipment which operates on a continuous basis is installed and division into identifiable cells is impossible, its movement shall be regulated to provide alternate loading and resting of the soil.

NR 214.15(2)(e)(e) The overland flow treatment system design shall evaluate the interaction between the primary factors influencing system performance and efficiency, such as temperature, downslope flow distance, wastewater hydraulic application rate and the rest period, to optimize treatment on the site.

NR 214.15(2)(f)(f) The overland flow system shall be arranged so that individual cells within the system can be taken out of service for resting without interrupting the discharge to the remaining cells.

NR 214.15(2)(g)(g) The distribution equipment shall be arranged so that the wastewater will be evenly distributed over the entire area of an overland flow cell and the wastewater travels down the slope in non-channelized flow.