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City attorney. The Portsmouth City Attorney or his designee. City Engineer. The Portsmouth City Engineer or his designee. Cul-de-sac. A street with only one outlet having a circular or "T" turn-around for a safe and convenient reverse traffic movement. Easement. A right granted by a property owner permitting a designated part or interest of the property to be used by others for a specific use or purpose. Exception. Permission to depart from the design standards of this section. Fire chief The Portsmouth Fire Chief or his designee. Geographic information system (GIS). Geographic information system owned and operated by the city. Governing body. The Portsmouth City Council. Health department. The Commonwealth of Virginia Department of Health or an authorized official, Agent or employee thereof. Highly erodible soils. Soils (excluding vegetation) with an erodibility index (EI) from sheet and rilI erosion equal to or greater than eight. The erodibility index for any soil is defined as the product of the formula RKLST, as defined by the "Food Security Act (F.S.A.) Manual" of August, 1988 in the "Field Office Technical Guide" of the U.S. Department of Agriculture Soil Conservation Service, where K is the soil susceptibility to water erosion in the surface layer; R is the rainfalI and runoff; LS is the combined effects of slope length and steepness; and T is the soil loss tolerance. Highly permeable soils. 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 Soils Handbook" of July 1983, as amended, in the "Field Office Technical Guide" of the U.S. Department of Agricultural Soil and Conservation Service. Hydric soils. Soils that are saturated, flooded or ponded long enough during the growing seasons to develop anaerobic conditions in the upper part, which are saturated for usually one week or more in the growing period and have the capacity to support hydrophytic vegetation. Impervious cover. A surface composed of any material that significantly impedes or prevents 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. Improvements. AII public and quasi-public utilities and facilities including, but not limited to, streets, sanitary sewers, waterlines, stormwater management and erosion control facilities, electrical service, monuments, signs, sidewalks and streetlights required by this chapter. Page 7 of 33