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Land Disturbing Activity Any activity that results in a change in the existing soil cover (both vegetative and <br />non -vegetative) and/or the existing soil topography. Land disturbing activities <br />include, but are not limited to clearing, grading, filling, and excavation. Compaction <br />that is associated with stabilization of structures and road construction shallalso <br />be considered a land disturbing activity. Vegetation maintenance practices, <br />including landscape maintenance and gardening, are not considered land -disturbing <br />activity. Stormwater facility maintenance is not considered land disturbing activity <br />if conducted according to established standards and procedures. <br />New development Land disturbing activities, including Class IV -general forest practices that are <br />conversions from timberland to other uses; structural development, including <br />construction or installation of a building or other structure; creation of hard <br />surfaces; and subdivision, short subdivision and binding site plans, as defined and <br />applied in Chapter 58.17 RCW. Projects meeting the definition of redevelopment <br />shall not be considered new development. <br />New Impervious Surface A surface that is: <br />• changed from a pervious surface to an impervious surface (e.g. <br />resurfacing by upgradingfrom dirtto gravel, asphalt, or concrete), or <br />■ upgraded from gravel to asphalt or concrete, or <br />■ upgraded from a bituminous surface treatment ("chip seal") to asphalt or <br />concrete. <br />Pervious Surface A surface material that allows stormwater to infiltrate into the ground. Examples <br />include lawn, landscape, pasture, native vegetation areas, and permeable <br />pavements. <br />Rain Garden A non -engineered shallow landscaped depression, with compost -amended native <br />soils and adapted plants. The depression is designed to pond and temporarily store <br />stormwater runoff from adjacentareas, and to allow stormwater to pass through the <br />amended soil profile. See BMP T5.14: Rain Gardens. <br />Redevelopment On a site that is already substantially developed (i.e., has 35% or more of existing <br />hard surface coverage), the creation or addition of hard surfaces; the expansion of <br />abuiIdingfootprintoraddition orreplacement ofastructure; structural development <br />including construction, installation or expansion of a building or other structure; <br />replacement of hard surface that is not part of a routine maintenance activity; and <br />land disturbing activities. <br />Replaced Hard Surface For structures, the removal and replacement of hard surfaces down to the <br />foundation. For other hard surfaces, the removal down to bare soil or base course <br />and replacement. <br />Sheet flow Runoff that flows over the ground surface as a thin, even layer, not concentrated in <br />a channel. <br />Stormwater Management Prepared by Ecology, contains BMPs to prevent, control or treat pollution in <br />Manual for Western stormwater and reduce other stormwater-related impacts to waters of the State. <br />Washington (SWMMWW) TheSWMMWWis intendedto provide guidance on measures necessary in western <br />Washington to control the quantity and quality of stormwater runoff from new <br />development and redevelopment. <br />City of Everett Public Works <br />Small ProjectStormwaterSitePlanReport April 2021 22 <br />