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9. IMPERVIOUS SURFACE: A hard surface area which either prevents or retards the entry of
<br />water into the ground. Common impervious surfaces include, but are not limited to, roof tops,
<br />walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel
<br />roads, packed earthen materials, or other surfaces which similarly impede the natural
<br />infiltration of surface and stormwater runoff.
<br />10. MAXIMUM EXTENT P-1~~A.r"'~ i-~~PRACTICABLE: A standard for water quality that
<br />applies to all MS4 operators regulated under the NPDES program. Since no precise definition of
<br />MEP exists, it allows for maximum flexibility on the part of MS4 operators as they develop and
<br />implement their programs to reduce the discharge of pollutants to the maximum extent
<br />practicable, including management practices, control techniques and system, design and
<br />engineering methods, and such other provisions as the Administrator or the State determines
<br />appropriate for the control of pollutants.
<br />8:11. MPCA: The Minnesota Pollution Control Agency.
<br />9=12. MUNICIPAL SEPARATE STORM SEWER SYSTEM (MS4): The system of conveyances
<br />(including sidewalks, roads with drainage systems, municipal streets, catch basins, curbs, gutters,
<br />ditches, man-made channels, or storm drains) owned and operated by the City and designed or used
<br />for collecting or conveying storm water, and which is not used for collecting or conveying sewage.
<br />x&13. NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES): The national
<br />program for issuing, modifying, revoking, and reissuing, terminating, monitoring, and enforcing
<br />permits, and imposing and enforcing pretreatment requirements under sections 307, 318, 402, and 405
<br />of the Clean Water Act, United States Code, title 33, sections 1317, 1328, 1342, and 1345.
<br />-1-1:14. PERSON: Any individual, firm, corporation, partnership, franchise, association or governmental
<br />entity.
<br />15. PERVIOUS SURFACE: Pervious areas permit water to enter the ground by virtue of their
<br />porous nature or by large voids in the material. Commonly pervious areas have vegetation
<br />growing on them.
<br />X16. POLLUTANT: Any substance which, when discharged has potential to or does any of the
<br />following:
<br />(i) Interferes with state designated water uses;
<br />(ii) Obstructs or causes damage to waters of the state;
<br />(iii) Changes water color, odor, or usability as a drinking water source through causes not attributable to
<br />natural stream processes affecting surface water or subsurface processes affecting groundwater;
<br />(iv) Adds an unnatural surface film on the water;
<br />(v) Adversely changes other chemical, biological, thermal, or physical condition, in any surface water or
<br />stream channel;
<br />(vi) Degrades the quality of ground water; or
<br />(vii) Harms human life, aquatic life, or terrestrial plant and wildlife. Pollutant includes but is not limited
<br />to dredged soil, solid waste, incinerator residue, garbage, wastewater sludge, chemical waste,
<br />biological materials, radioactive materials, rock, sand, dust, industrial waste, sediment, nutrients,
<br />toxic substance, pesticide, herbicide, trace metal, automotive fluid, petroleum-based substance, and
<br />oxygen-demanding material.
<br />X17. POLLUTE: To discharge pollutants into waters of the state.
<br />X418. POLLUTION: The direct or indirect distribution of pollutants into waters of the state.
<br />X19. PREMISES: Any building, lot, parcel of land, or portion of land whether improved or
<br />unimproved including adjacent sidewalks and parking strips
<br />x:20. STATE DESIGNATED WATER USES: Uses specified in state water quality standards.
<br />I-?21. STORM DRAINAGE SYSTEM: Publicly-owned facilities by which storm water is collected
<br />and/or conveyed, including but not limited to any roads with drainage systems, municipal streets,
<br />gutters, curbs, inlets, piped storm drains, pumping facilities, retention and detention basins, natural and
<br />human-made or altered drainage channels, reservoirs, and other drainage structures.
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