The terms “single residential,” “duplex,” “townhome,” “accessory building,” and “multifamily residential” mean the definition of such terms contained in the County’s current Building Code, CCC Title 21.

“Best management practice(s)” or “BMPs” means the schedule of activities, prohibitions of practices, maintenance procedures, and structural and/or managerial practices approved by the Washington State Department of Ecology that, when used singly or in combination, prevent or reduce the release of pollutants and other adverse impacts to waters of Washington State.

“Clallam County Small Project Drainage Manual” means the manual adopted by Clallam County to be used for small-scale residential projects that meet the requirements for a small project drainage plan review.

“Clearing” means the destruction and removal of vegetation by manual, mechanical, or chemical methods resulting in exposed soils. This does not include mowing, landscape maintenance or pruning consistent with accepted horticultural and arboricultural practices, which does not impair the health or survival of trees and associated vegetation.

“Critical areas” means any of those areas of Clallam County which meet the definition of geologically hazardous areas; wetlands; streams; flood hazard areas; fish and wildlife conservation areas; and areas with a critical recharging effect on aquifers used for potable water and are regulated under this title.

“Drainage permit” means the written permission by the County Engineer, or their designee to the permittee/applicant to proceed with the act of land development activities, whether new development or redevelopment, within the requirements and procedures contained in this chapter. The drainage permit shall include the associated approved site plan, any required stormwater site plans consistent with minimum technical requirements set forth herein, any required construction stormwater pollution prevention plan consistent with the minimum technical requirements set forth herein, and any conditions of approval as well as the permit form itself.

“Hard surface” means an impervious surface, a permeable pavement, or a vegetated roof. An impervious surface is a surface that blocks the natural infiltration of surface water. Common hard surfaces include structures, asphalt pavement, cement concrete, and compacted gravel. Permeable pavements and green roofs shall be considered hard surfaces for minimum requirement thresholds but modelled depending on the characteristics of the design.

“Impervious surface” means a hard surface area that either prevents or retards the entry of water into the soil mantle as under natural conditions prior to development and 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. Impervious surfaces include, but are not limited to, rooftops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, other surfaces which similarly prevent the natural infiltration of stormwater.

“Land development activity” means new development and redevelopment and land disturbing activity as those terms are defined herein.

“Land disturbing activity” means any activity that results in a movement of earth or any 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, grubbing, filling, excavation, demolition, controlled burning, and site preparation. Compaction that is associated with stabilization of structures and/or road construction shall also be considered land disturbing activity. Vegetative maintenance practices (as defined herein) are not considered land disturbing activity.

“Low impact development (LID)” means a stormwater and land use management strategy that strives to mimic predisturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by emphasizing conservation, use of on-site natural features, site planning, and distributed stormwater management practices that are integrated into a project design.

“New development” means any land disturbing activities, including but not limited to clearing, grading, grubbing, filling, excavation and demolition; Class IV general forest practices that are conversions from timber land to other uses; reclamation of mineral extraction; reclamation of sand and gravel extraction; structural development, including construction, installation or expansion of a building or other structure; creation of hard surfaces; and any subdivision, short subdivision and binding site plans, as defined and applied in Chapter 58.17 RCW and any land division as defined herein. Projects meeting the definition herein of redevelopment shall not be considered new development.

“Pollutant” means anything which causes or contributes to pollution. Pollutants may include, but are not limited to: paints, varnishes, and solvents; oil and other automotive fluids; nonhazardous liquid and solid wastes and yard wastes; refuse, rubbish, garbage, litter, or other discarded or abandoned objects, and accumulations; floatables, pesticides, herbicides, and fertilizers; hazardous substances and wastes; sewage, fecal coliform and pathogens; dissolved and particulate metals; animal wastes; wastes and residues that result from constructing a building or structure; and noxious or offensive matter of any kind.

“Project” means any proposed action to alter or develop a site.

“Project site” means that portion of a property, properties, or right-of-way subject to land disturbing activities, new hard surfaces, or replaced hard surfaces.

“Redevelopment” means development of a site that is already substantially developed (i.e., has 35 percent or more existing hard surface coverage) through the creation or addition of hard surfaces; the expansion of a building footprint or addition or replacement of a structure; structural development including construction, installation or expansion of a building or other structure; subdivision, short subdivision and binding site plans, as defined and applied in Chapter 58.17 RCW; replacement of hard surface that is not part of a routine maintenance activity; and other land disturbing activities including but not limited to clearing, grading, grubbing, filling, excavation and demolition.

“Replaced hard surface” means, for structures, the removal and replacement of hard surfaces down to the foundation. For other hard surfaces, the removal down to bare soil or base course and replacement.

“Site” means the area defined by the legal boundaries of a parcel or parcels of land that is (are) subject to new development or redevelopment. For road projects, the length of the project site and the right-of-way boundaries define the site.

“Stormwater drainage system” means facilities by which stormwater is collected and/or conveyed, including, but not limited to, any roads with drainage systems, municipal streets, gutters, curbs, inlets, piped storm drains, pumping facilities, retention and detention basins, natural and manmade or altered drainage channels, reservoirs, and other drainage structures.

“Stormwater facility” means a constructed component of a stormwater drainage system, designed or constructed to perform a particular function, or multiple functions. Stormwater facilities include, but are not limited to, pipes, swales, ditches, culverts, street gutters, detention ponds, retention ponds, constructed wetlands, infiltration devices, catch basins, oil/water separators, and biofiltration swales.

“Vegetative maintenance” means lawn maintenance, brush and tree pruning, and other normal land maintenance activities involving cutting, removal, or planting of vegetation by manual, mechanical, or chemical methods, such as gardening.

“Watercourse” means any natural or artificial (i.e., manmade) waterway area, whether perennial or intermittent, which flows in a definite direction and course or is used for the holding, delay or storage of waters, which functions at any time to convey or store stormwater runoff. Watercourses include, but are not limited to, a creek, stream, river, or any constructed waterway, channel, canal, ditch, irrigation ditch or road ditch.