Section 218.04. Definitions.

  The definitions of ch. NR 205 apply to terms used in this chapter and in WPDES permits not otherwise defined in this section.

(1)  "Process waste" means any water which, during manufacturing or processing, comes into direct contact with or results from the production or use of any raw material, intermediate product, finished product, byproduct, or waste product, and is likely to contain in solution or suspension various components of such raw materials and products.

(2)  "Domestic waste" means the type of waste normally discharged from plumbing facilities in private dwellings and includes, but is not limited to, sanitary, bath, laundry, dishwashing, garbage disposal and cleaning wastes.

(3)  "Municipal waste" means the mixture of domestic, process, and other wastes tributary to any given municipal sanitary sewerage or treatment system.

(4)  "Cooling water" means water which has been used primarily for cooling but which may be contaminated with process waste or airborne material, such as the discharge from barometric condensers or the blowdown from cooling towers.

(5)  "Noncontact cooling water" means wastewater which has not come into contact with any raw material, intermediate or finished product, or waste and has been used in heat exchangers, air or refrigeration compressors or other cooling means where contamination with process waste is not normally expected.

(6)  "Storm water" or "storm runoff" means water resulting from melting snow or rainfall, except that defined in sub. (7) .

(7)  "Contaminated storm water" means a point source discharge of storm water which the department has identified as a significant contributor of pollution in accordance with the definition of s. 283.01 (8) , Stats.

(8)  "Continuous effluent" means a discharge which is normally continuous throughout a day or during operating hours in any facility but which may be subject to interruptions or variations in volume.

(9)  "Batch effluent" means a discharge which is periodic and of relatively short duration resulting from batch operations, washup operations, or periodic discharges from tanks, ponds, and recycling systems.

(10)  "Grab sample" means a single sample taken at one moment of time or a combination of several smaller samples of equal volume taken in less than a 2 minute period. Where the term is used in connection with monitoring temperature or pH it means a single measurement.

(11)  "Composite sample" means a combination of individual samples of equal volume taken at approximately equal intervals not exceeding one hour over a specified period of time.

(12)  "24-hour composite sample" means a combination of individual samples taken at intervals of not more than one hour such that the volumes of each of the individual samples and of the combination are proportional to the volumes of flow during each interval and during the 24-hour period respectively.

(13)  "Continuous sample" means a composite of successive individual samples of equal volume taken automatically at equal intervals not exceeding 15 minutes. Where the term is used in connection with monitoring temperature or pH it means continuous in-line recording or monitoring at intervals of not more than 15 minutes.

(14)  "Proportional sample" means a composite of successive individual samples taken during operating or discharge hours, whichever is longer, where the individual samples are taken at frequent intervals not exceeding 15 minutes and are either:

(a) Such that the volume of each is proportional to the rate of flow at the time it is taken, or

(b) Are of equal volume and taken at intervals such that there is a constant volume of discharge during each interval.

(15)  "Estimated" used to specify the type of sample for flow measurement, means a reasonable approximation of the average daily flow based on water balance, an uncalibrated weir, or any of the methods included in s. NR 218.05 (3) (b) disregarding requirements for continuously recording flow.

(16)  "Total daily" used to specify the type of sample for flow measurement, means the determination of daily flow from at least one measurement when daily frequency is specified and 3 measurements in any other specified frequency period using methods appropriate to the type of waste flow involved set forth in s. NR 218.05 , but disregarding requirements for continuously recording flow.

(17)  "Continuous" or "continuously" used to specify the type of sample for flow measurement, means the determination of daily flow at the frequency specified using methods of s. NR 218.05 (1) , (3) (a) or (4) appropriate to the type of waste flow involved.

History: Cr. Register, June, 1976, No. 246 , eff. 7-1-76.