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<br />highly erodible soils; (3) are at least 500 feet or longer; and, (4) drain at least 10 <br />acres. <br /> <br />Impervious surface/area. Any surface area that causes water to run off the <br />surface in greater quantities or at an increased rate of flow from conditions pre- <br />existing to development. Types of impervious surface include, but are not limited to, <br />rooftops, asphalt and concrete parking lots, driveways, roads, sidewalks, and <br />pedestrian plazas. Note: Slatted decks are considered pervious. Gravel surfaces are <br />considered pervious unless they cover impervious surfaces or are compacted to a <br />degree that 'causes their runoff coefficient to exceed 0.8. <br /> <br />Oil control facility. Any structure or drainage device that is designed, constructed, <br />and maintained to remove oil and grease from storm runoff. <br /> <br />Pollution reduction facility. Any structure or drainage device that is designed, <br />constructed, and maintained to collect and filter, retain, or detain surface water <br />runoff during and after a storm event for the purpose of maintaining or improving <br />surface and/or groundwater quality. <br /> <br />Property suspected or known to contain contaminants in the soil or <br />groundwater. Any real property where the presence of any hazardous substance <br />or petroleum product indicates an existing release, past release, or threatened <br />release of a hazardous substance or petroleum product into the ground, ground <br />water, or surface water of the property. <br /> <br />Source control. Any structure, device, or design that is used to eliminate or reduce <br />pollution from a source. <br /> <br />Stormwater Management Manual. The City of Eugene Stormwater Management <br />Manual adopted by the city in the manner set forth in EC 2.019, City ManaQer- <br />Administrative and RulemakinQ Authoritv and Procedures. . <br /> <br />Stormwater Management Facility. Any structure or configuration of the ground that <br />is used or, by its location, becomes a place where stormwater flows or is <br />accumulated, including but not limited to, pipes, sewers, curbs, gutters, manholes, <br />catch basins, ponds, open drainage ways, runoff control facilities, wetlands, and their <br />accessories. <br /> <br />Water Quality Design Storm. A theoretical storm for estimating the amount of <br />stormwater runoff to be treated. Facilities designed to store and treat a volume of <br />stormwater shall be sized in accordance with the Stormwater Management Manual., <br /> <br />Section 2. Subsection (2) of Section 9.6420 of the Eugene Code, 1971, is <br /> <br />amended as follows. <br /> <br />Ordinance - 2 <br />