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