Definitions

Definitions. Definitions. The definitions of terms and meanings of abbreviations used in this chapter are set forth in s. 283.01 , Stats., chs. NR 205 and 218 , and as follows: (1) “7-day average” means the arithmetic mean of pollutant parameter values for samples collected in a period of 7 consecutive days. (2) “30-day average” means the arithmetic mean of pollutant parameter values for samples collected in a period of 30 consecutive days. (2e) “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. (2m) “Building backup” means an accumulation of sewage in any public or private building caused by blockage, failure, or other hydraulic constraint in the sewage collection system or by blockage or failure of the building sewer or private interceptor main sewer. (2s) “Building sewer” has the meaning specified under s. NR 110.03 (6s) . (3) “CBOD 5 ” means the 5-day carbonaceous biochemical oxygen demand. (3d) “CMOM” means a capacity, management, operation, and maintenance program under s. NR 210.23 . (3h) “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. (3p) “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. (3t) “Combined sewer treatment facility” has the meaning specified under s. NR 110.03 (7s) . (4) “Disinfection” means the operation of an ultraviolet lamp unit, or the addition of chemical disinfectants with adequate mixing and detention times, to provide pathogen reductions. (5) “Effluent concentrations consistently achievable through proper operation and maintenance” means: (a) For a given pollutant parameter, the 95th percentile value for the 30-day average effluent quality achieved by a treatment works in a period of at least 2 years, excluding values attributable to upsets, bypasses, operational errors, or other unusual conditions, and (b) A 7-day average value equal to 1.5 times the value derived under par. (a) . (6) “Facilities eligible for treatment equivalent to secondary treatment” means treatment works which meet all of the following: (a) The BOD 5 and SS effluent concentrations consistently achievable through proper operation and maintenance of the treatment works exceed the minimum level of the effluent quality set forth in s. NR 210.05 (1) (a) and (b) ; (b) Trickling filters, aerated lagoons or waste stabilization ponds are used as the principal processes; and (c) The treatment works provide significant biological treatment of municipal wastewater. (6e) “Hydraulic constraint” means the structural collapse of a sewer, an accumulation of material in a sewer or an insufficiently-sized sewer such that sewage flow is impeded or stopped from flowing downstream. (6m) “Infiltration” has the meaning specified under s. NR 110.03 (16) . (6s) “Inflow” has the meaning specified under s. NR 110.03 (17) . (7) “NH 3- N” means ammonia nitrogen. (8) “Percent removal” means a percentage expression of the removal efficiency across a treatment plant for a given pollutant parameter, as determined from the 30-day average values of the raw wastewater influent pollutant concentrations to the facility and the 30-day average values of the effluent pollutant concentrations for a given time period. (8m) “Private interceptor main sewer” has the meaning specified under s. NR 110.03 (26m) . (9) “Privately owned domestic sewage treatment works” means those facilities which treat domestic wastewater and are owned and operated by nonmunicipal entities or enterprises such as mobile home parks, restaurants, hotels, motels, country clubs, resorts, etc., which are permitted under ch. 283 , Stats. (10) “Sanitary sewer overflow” means a release of wastewater from a sewage collection system or an interceptor sewer directly into a water of the state or to the land surface. (10m) “Sanitary survey” means a thorough investigation and evaluation of a surface water including bacteriological sampling to determine the extent and cause of any bacterial contamination. (11) “Sewage collection system” has the meaning specified under s. NR 110.03 (28) . (12) “Sewage treatment facility” has the meaning specified under s. NR 110.03 (29) . (13) “Sewage treatment facility overflow” means a release of wastewater from a location within a sewage treatment facility, other than permitted effluent outfall structures, directly to a water of the state or to the land surface. A sewage treatment facility overflow does not include blending, controlled diversions or discharges from permitted combined sewage treatment facility effluent outfall structures. (14) “Sewer extension” has the meaning specified under s. NR 110.03 (29m) . (15) “Sewerage system” has the meaning specified under s. NR 110.03 (30) . (16) “Significant biological treatment” means the use of an aerobic or anaerobic biological treatment process in a treatment works to consistently achieve a 30-day average of at least 65% removal of BOD 5 .