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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 shall also <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 thatis: <br /> ■ changed from a pervious surface to an impervious surface (e.g. <br /> resurfacing by upgradingfrom dirt to 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 adjacent areas,and to allow stormwaterto pass through the <br /> amended soil profile.See BMP TS.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 /> abuildingfootprintoraddition orreplacementofastructure;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 /> City of Everett Public Works <br /> Small ProjectStormwaterSitePlanReport September 2022 3 <br />