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"Development" means the construction, or 'substantial alteration of residential, commercial, industrial, institutional, recreation, transportation, or utility facilities or structures. "Diameter at breast height" or "DBH' means the diameter of a tree measured outside the bark at a point 4.5 feet above ground. "Dripline" means a vertical projection to the ground surface from the furthest lateral extent of a tree's leaf canopy. "Highly Erodible Soils" means soils (excluding vegetation) with an erodibility index (EI) from sheet and rill erosion to or greater than eight. The erodibility index for any soil is defined as the product of the formula RKLS/T, where K is the soil susceptibility to water erosion in the sm'ace layer; R is the rainfall and runoff; LS is the combined effects of slope length and steepness; and T is the soil loss tolerance. "Highly Permeable Soils" means soils with a given potential to transmit water through the soil profile. Highly permeable soils are identified as any soil having a permeability equal to or greater than six inches of water movement per hour in any part of the soil profile to a depth of 72 inches (permeability groups "rapid" and "very rapid") as found in the "National Soil Survey Handbook" of November 1996 in the "Field Office Technical Guide" of the U.S Department of Agriculture Natural Resources Conservation Service. "Impervious cover" means a surface composed of any material that significantly impedes or prevents natural infiltration of water into the soil. Impervious surfaces include, but are not limited to: roofs, buildings, streets, parking areas, and any concrete, asphalt, or compacted gravel surface. "Intensely Developed Area" or "IDA" means a portion of a Resource Protection Area or a Resource Management Area designated by the City Council where development is concentrated and little of the natural environment remains. "Land Disturbance" means any land change which may result in soil erosion from water or wind and the movement of sediments into state waters or onto lands in the state, including, but not limited to, clearing of vegetation, grading, excavating, transporting, and filling of land. "Nonpoint source pollution" means pollution consisting of constituents such as sediment, nutrients, and organic and toxic substances from diffuse sources, such as runoff from agriculture and urban land development and use. "Nontidal wetlands" means those wetlands Other than tidal Wetlands that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions, as defined by the U.S. Environmental