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velocities.
<br />2. COMMERCIAL: Activity conducted in connection with a business.
<br />3. DISCHARGE: Adding, introducing, releasing, leaking, spilling, casting,
<br />throwing, or emitting any pollutant, or placing any pollutant in a location
<br />where it is likely to pollute waters of the state.
<br />4. EQUIPMENT: Implements used in an operation or activity. Examples
<br />include, but are not limited to; lawn mowers, weed whips, shovels,
<br />wheelbarrows and construction equipment.
<br />5. EROSION: any process that wears away the surface of the land by the action
<br />of water, wind, ice, or gravity. Erosion can be accelerated by the activities of
<br />man and nature.
<br />6. GROUNDWATER: Water contained below the surface of the earth in the
<br />saturated zone including, without limitation, all waters whether under
<br />conned, unconfined, or perched conditions, in near surface unconsolidated
<br />sediment or regolith, or in rock formations deeper underground.
<br />7. ILLEGAL/ ILLICIT DISCHARGE: Any direct or indirect nonce
<br />wa4rstormwater discharge to the storm drainage system, except as
<br />exempted in this chapter.
<br />8. ILLICIT CONNECTION: Either of the following:
<br />a. Any drain or conveyance, whether on the surface or subsurface, which
<br />allows an illegal discharge to enter the storm drain system (including any
<br />non stofm wat stormwater discharge) including wastewater, process
<br />wastewater, and wash water and any connections to the storm drain
<br />system from indoor drains and sinks, regardless of whether said drain or
<br />connection had been previously allowed, permitted, or approved by the
<br />City; or,
<br />b. Any drain or conveyance connected from a residential, commercial or
<br />industrial land use to the storm drain system which has not been
<br />documented in plans, maps, or equivalent records and approved by the
<br />City.
<br />9. IMPERVIOUS SURFACE: A hard surface area which either prevents or
<br />retards the entry of water into the ground. Common impervious surfaces
<br />include, but are not limited to, roof tops, walkways, patios, driveways,
<br />parking lots or storage areas, concrete or asphalt paving, gravel roads, packed
<br />earthen materials, or other surfaces which similarly impede the natural
<br />infiltration of surface and steFm wat stormwater runoff.
<br />10. MAXIMUM EXTENT PRACTICABLE (MEP): A standard for water
<br />quality that applies to all MS4 operators regulated under the NPDES
<br />program. Since no precise definition of MEP exists, it allows for maximum
<br />flexibility on the part of MS4 operators as they develop and implement their
<br />programs to reduce the discharge of pollutants to the maximum extent
<br />practicable, including management practices, control techniques and system,
<br />design and engineering methods, and such other provisions as the
<br />Administrator or the State determines appropriate for the control of
<br />pollutants.
<br />11. MECHANICAL CLEANING TECHNIQUES: Arranging the collision
<br />between the substance being removed and some object. Mechanical
<br />cleaning techniques include: sweeping, shoveling, or blowing. This does
<br />NOT include using water to clean the surface.
<br />12. MPCA: The Minnesota Pollution Control Agency.
<br />13. MUNICIPAL SEPARATE STORM SEWER SYSTEM (MS4): The system
<br />of conveyances (including sidewalks, roads with drainage systems,
<br />municipal streets, catch basins, curbs, gutters, ditches, channels, or storm
<br />
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