Ordinance 3880-22 - Laserfiche WebLink

Version: May 19, 2022 causes water to run off the surface in greater quantities or at an increased rate of flow from the flow present under natural conditions prior to development. Common impervious surfaces include, but are not limited to, roof tops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled macadam, or other surfaces which similarly prevent the natural infiltration of stormwater. 11. "Land disturbing activity": Any activity that results in a change in the existing soil cover(both vegetative and nonvegetative) and/or the existing soil topography. Land disturbing activities include, but are not limited to, clearing, grading, filling, and excavation. Compaction that is associated with stabilization of structures and road construction shall also be considered land disturbing activity. Vegetation maintenance practices, including landscape maintenance and gardening, are not considered land disturbing activity. Stormwater facility maintenance is not considered land disturbing activity if conducted according to established standards and procedures. 12. "Low Impact Development Best Management Practices" shall mean distributed stormwater management practices, integrated into a project design, that emphasize pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration. 13. "Maintenance": Includes repair and maintenance activities conducted on currently serviceable structures, facilities, and equipment that involve no expansion or use beyond that previously existing and result in no significant adverse hydrologic impact. It includes those usual activities taken to prevent decline, lapse, or cessation in the use of structures and systems. Those usual activities may include replacement of dysfunctional facilities, including cases where environmental permits require replacing an existing structure with a different type structure, as long as the functioning characteristics of the original structure are not changed. One example is the replacement of a collapsed, fish blocking, round culvert with a new box culvert under the same span, or width of roadway. In regard to stormwater facilities, maintenance includes assessment to ensure ongoing proper operation, removal of built-up pollutants (i.e., sediments), replacement of failed or failing treatment media, and other actions taken to correct defects as identified in the maintenance standards of the city's stormwater management manual. 14. "Minimum Requirements"for stormwater management at new development and redevelopment sites is as defined in the Stormwater management manual. 15. "Natural location" of drainage system shall refer to the location of those channels, swales, and other conveyance systems as defined by the topographic contours existing for the subject property, from city of Everett aerial topographic maps dated April 8, 1969, and April 25, 1971. In cases where the above maps are inconclusive, "natural location" shall refer to the existing features unless it can be shown from 3