Chapter NR 110
SEWERAGE SYSTEMS
NR 110.04 Alternative requirements. NR 110.05 Sewer extensions. NR 110.06 Construction plans for reviewable projects. NR 110.07 Specifications for reviewable projects. NR 110.08 Facilities plans for reviewable projects. NR 110.09 Sewage treatment facilities projects. NR 110.10 Sewage collection system projects. NR 110.11 Sewage lift stations. NR 110.12 Owner approval requirement. NR 110.13 Sewer design criteria. NR 110.14 Sewage lift stations design criteria. NR 110.15 General requirements for sewage treatment facilities. NR 110.16 Screening devices. NR 110.17 Grit removal facilities. NR 110.18 Settling tanks. NR 110.19 Trickling filters. NR 110.20 Rotating biological contactors. NR 110.21 Activated sludge. NR 110.22 Physical-chemical treatment. NR 110.25 General conditions required for all land disposal systems. NR 110.255 Conditions required for specific types of land disposal systems. NR 110.26 Sludge handling, storage and disposal. NR 110.27 Requirements for certified or registered laboratory. Ch. NR 110 HistoryHistory: Chapter NR 110 as it existed on November 30, 1974 was repealed and a new chapter NR 110 was created effective December 1, 1974.
NR 110.01NR 110.01 Applicability. This chapter is applicable to all new or modified sewerage systems, excluding only industrial waste treatment facilities. This chapter also applies to sewerage systems employing land disposal of sewage effluent, except those systems defined as plumbing within the purview of s. 145.01 (10) (a) 2., Stats. NR 110.01 NoteNote: The authority to enact these rules is contained in ch. 281, Stats. Pursuant to s. 299.97, Stats., any person who violates this chapter shall forfeit not less than $10 nor more than $5,000 for each violation. Each day of continued violation is a separate offense. NR 110.01 HistoryHistory: Cr. Register, November, 1974, No. 227, eff. 12-1-74; correction was made under s. 13.93 (2m) (b) 7., Stats., Register, May, 2001, No. 545; correction made under s. 13.92 (4) (b) 7., Stats., Register July 2010 No. 655, eff. 8-1-10. NR 110.03NR 110.03 Definitions. For purposes of this chapter: NR 110.03(1)(1) “Approved areawide waste treatment management plan” means a plan or element thereof developed pursuant to Section 208 of the Federal Water Pollution Control Act Amendments of 1972 as amended by the Clean Water Act Amendments of 1977 (33 USC 1251 et seq.) and approved by the state of Wisconsin. NR 110.03(2)(2) “Approval” means the written approval of the department for any project requiring approval pursuant to s. 281.41, Stats., and s. NR 108.03. NR 110.03(4)(4) “ASTM” means standards developed by ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959. NR 110.03 NoteNote: Copies of ASTM standards referenced in this chapter are available for inspection at the office of the department of natural resources, the secretary of state’s office, and the legislative reference bureau, and may be obtained for personal use from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.
NR 110.03(6)(6) “AWWA” means the American Water Works Association, 6666 West Quincy Avenue, Denver, CO 80235. NR 110.03 NoteNote: Copies of AWWA standards referenced in this chapter are available for inspection at the offices of the department of natural resources, the secretary of state’s offices, and the legislative reference bureau, and may be obtained for personal use from the American Water Works Association, 6666 West Quincy Avenue, Denver, CO 80235.
NR 110.03(6e)(6e) “Bedrock” means the rocks that underlie soil material or where weathered in-place consolidated material larger than 2 millimeters in size is greater than 50% by volume. NR 110.03 NoteNote: Section NR 210.03 (2e) reads: “Blending” means the routing of untreated or partially treated wastewater around a biological treatment process, or a portion of a biological treatment process, within a sewage treatment facility. The routing of untreated or partially treated wastewater around a portion of a biological treatment process is considered to be blending only if the entire wastewater flow has not received biological treatment. NR 110.03(6s)(6s) “Building sewer” means that part of the drain system not within or under a building which conveys its discharge to a public sewer, private interceptor main sewer, private onsite wastewater treatment system, or other point of discharge or dispersal. NR 110.03 NoteNote: This is the same definition as contained in s. SPS 381.01 (44). A building sewer may also be referred to as a building lateral. NR 110.03 NoteNote: Section NR 205.03 (5) reads: “Bypass” means the intentional diversion of waste streams from any portion of a sewage treatment facility or a wastewater treatment facility. A bypass does not include a building back-up or a combined sewer overflow. NR 110.03 NoteNote: Section NR 210.03 (3h) reads: “Combined sewer overflow” means a release of wastewater from a combined sewer system directly into a water of the state or to the land surface. NR 110.03 NoteNote: Section NR 210.03 (3p) reads: “Combined sewer system” means a wastewater collection system owned by a municipality that conveys domestic, commercial, and industrial wastewater and storm water runoff through a single pipe system to a publicly owned treatment works. NR 110.03(7s)(7s) “Combined sewer treatment facility” means all the structures, pipes and other equipment that constitute the various treatment processes and treatment units employed to reduce pollutants in wastewater from combined sewer systems. NR 110.03 NoteNote: Section NR 205.03 (9m) and Note reads: “Controlled diversion” means the routing of untreated or partially treated wastewater around any treatment unit within a sewage or wastewater treatment facility which is then recombined with undiverted wastewater prior to the effluent sampling location and prior to effluent discharge. NR 110.03 NoteNote: Controlled diversions at a sewage treatment facility do not include blending and may occur only in compliance with s. NR 205.07 (1) (v). NR 110.03(11)(11) “Cost-effective analysis” means a systematic comparison of alternative means of meeting state water quality standards, effluent limitations or other treatment standards in order to identify the alternative which will minimize the total resources costs over the planning period. These resources costs include monetary costs and environmental as well as other non-monetary costs. NR 110.03(12)(12) “Department” means the department of natural resources. NR 110.03(12g)(12g) “Design flow” means the anticipated wastewater discharge rate to a sewerage system component, which is used to design the sewerage system component to provide compliance with WPDES permit limits and other performance objectives, during the most critical operating conditions anticipated within the design planning period. Specific design flow terms used in this chapter, include the following: NR 110.03(12g)(a)(a) “Average daily base flow” means the average of the daily flow volumes anticipated to occur for a continuous 12-month period, less infiltration and inflow, and expressed as a daily average. NR 110.03(12g)(b)(b) “Average design flow” means the average of the daily flow volumes anticipated to occur for a continuous 12-month period, expressed as a daily average. NR 110.03(12g)(c)(c) “Maximum month design flow” means the largest volume of flow anticipated to occur during a continuous 30-day period, expressed as a daily average. NR 110.03(12g)(d)(d) “Maximum week design flow” means the largest volume of flow anticipated to occur during a continuous 7-day period, expressed as a daily average. NR 110.03(12g)(e)(e) “Maximum day design flow” means the largest volume of flow anticipated to occur during a one-day period, expressed as a daily average. NR 110.03(12g)(f)(f) “Maximum hour design flow” means the largest volume of flow anticipated to occur during a one-hour period, expressed as a daily or hourly average. NR 110.03(12g)(g)(g) “Peak instantaneous design flow” means the maximum anticipated instantaneous flow. NR 110.03(12g)(h)(h) “Peak design flow” and “maximum design flow” mean the largest volume of flow anticipated to occur on an infrequent basis, expressed as a daily average. The “peak design flow” or “maximum design flow” may be equal to any one of the design flows defined in pars. (c) to (g). NR 110.03(12m)(12m) “Design management zone” or “DMZ” means a 3-dimensional area, bounded by a set horizontal distance from the application or containment area, as specified in Table 4, ch. NR 140, and by variable vertical distance which extends from the land surface downward through all saturated formations. NR 110.03 NoteNote: The size of the DMZ may be altered by the department based on the criteria in s. NR 140.22 (3). NR 110.03(13)(13) “Dry land access” means a sewage treatment facility service road which has a minimum elevation of at least one foot above the regional flood elevation. NR 110.03(13c)(13c) “Excessive infiltration/inflow” means the quantities of infiltration/inflow which can be economically eliminated from a sewerage system by rehabilitation, as determined in a cost-effectiveness analysis that compares the cost of correcting the infiltration/inflow conditions to the total costs for transportation and treatment of the infiltration/inflow. NR 110.03(13e)(13e) “High groundwater level” means the higher of either the elevation to which the soil is saturated as observed as a free water surface in an unlined hole or the elevation to which the soil has been seasonally or periodically saturated as indicated by soil color patterns throughout the soil profile. NR 110.03(13t)(13t) “Highest anticipated groundwater elevation” means the sum of the calculated mounding effects of the disposal discharge and the seasonal high groundwater level. NR 110.03(14e)(14e) “Hydraulic application rate” means the average daily volume of effluent discharged to a designed acreage of the land application system during a calendar month or other period of time specified in a WPDES permit. The rate is calculated by dividing the total discharge volume for the month or period of time by the acreage of land and by the number of days in the month or period of time, usually expressed in units of gallons per acre per day. For overland flow systems, the hydraulic application rate is expressed as a flow rate per unit width of slope per day. NR 110.03(14t)(14t) “Hydrogeologist” means a person who is a graduate of an accredited institution of higher education and who has successfully completed 30 semester hours or 45 quarter hours of course work in geology. At least 6 semester hours or 9 quarter hours of the geology course work must be in hydrogeology, geohydrology or groundwater geology. This person shall also have acquired through education and actual field experience the ability to direct the drilling of borings, and the installation and development of wells; describe and classify geology samples and evaluate and interpret geologic and hydrogeologic data in accordance with the requirements of chs. NR 110 and 206. NR 110.03(15)(a)(a) Any nongovernmental, nonresidential user of a municipally owned sewerage system which discharges more than the equivalent of 25,000 gallons per day (gpd) of sanitary wastes and which is identified in the Standard Industrial Classification Manual, 1972, United States Office Management and Budget, as amended and supplemented as of October 1, 1978 under one of the following divisions: Division A. Agriculture, Forestry, and Fishing
Division B. Mining
Division D. Manufacturing
Division E. Transportation, Communications, Electric,
Gas, and Sanitary Services
Division I. Services.
NR 110.03(15)(a)1.1. In determining the amount of a user’s discharge, domestic wastes or discharges from sanitary conveniences may be excluded. NR 110.03(15)(a)2.2. After applying the sanitary waste exclusion in subd. 1., discharges in the above divisions that have a volume exceeding 25,000 gpd or the weight of biochemical oxygen demand (BOD) or suspended solids (SS) equivalent to that weight found in 25,000 gpd of sanitary waste are considered industrial users. Sanitary wastes, for purposes of this calculation of equivalency, are the wastes discharged from residential users. The municipality shall, with the department’s approval, define the strength of the residential waste discharges in terms of parameters including biochemical oxygen demand (BOD) and suspended solids (SS) per volume of flow as a minimum. Dischargers with a volume exceeding 25,000 gpd or the weight of BOD or SS equivalent to that weight found in 25,000 gpd of sanitary waste are considered as industrial users. NR 110.03(15)(b)(b) Any nongovernmental user of a municipally owned sewerage system which discharges wastewater to the sewerage system which contains toxic pollutants or poisonous solids, liquids, or gases in sufficient quantity either singly or by interaction with other wastes, to contaminate the sludge of any municipal system, or injure or interfere with any sewage treatment process, constitutes a hazard to humans or animals, creates a public nuisance, or creates any hazard in or has an adverse effect on the waters receiving any discharge from the treatment works; NR 110.03(15)(c)(c) All commercial users of an individual system constructed with grant assistance under s. 281.57, Stats. NR 110.03(16)(16) “Infiltration” means water other than wastewater that enters a sewerage system (including sewer service connections) from the ground through such sources as defective pipes, pipe joints, connections, or manholes. Infiltration does not include, and is distinguished from, inflow. NR 110.03(17)(17) “Inflow” means water other than wastewater that enters a sewerage system (including sewer service connections) from sources such as roof leaders, cellar drains, yard drains, area drains, foundation drains, sump pumps, drains from springs and swampy areas, manhole covers, cross connections between storm sewers and sanitary sewers, catch basins, cooling towers, storm waters, surface runoff, street wash waters, or drainage. Inflow does not include, and is distinguished from, infiltration. NR 110.03(18)(18) “Interceptor sewer” means a sewer whose primary purpose is to transport wastewaters from collector sewers to a treatment facility. NR 110.03(18m)(18m) “Intermediate sludge storage” means the storage of sludge for a period of more than 24 hours and no more than 3 months.
