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9i <br /> other structure; creation of impervious surfaces; and subdivision and short subdivision, and <br /> binding site plans as defined and applied in Chapter 58.17 RCW. <br /> (13) "Natural Location" of drainage system shall refer to the location of those channels, swales, <br /> and other conveyance systems as defined by the topographic contours existing for the <br /> subject property, from City of Everett aerial topographic maps dated 4-8-69 and 4-25-71. In <br /> cases where the above maps are inconclusive, "natural location", shall refer to the existing <br /> features unless it can be shown from documented maps or photographs that the features <br /> have existed less than ten (10) years. In cases of disagreement, the decision of the City <br /> Engineer as to "natural location" shall be final. <br /> (14) "Planned Residential Development" shall mean a land development project <br /> comprehensively planned as an entire via a single site plan which peuuits flexibility in <br /> building siting, (lot size, setback lines, etc.), mixture of housing types, useable open space <br /> and preservation of sufficient natural feature. <br /> (15) "Pollutant-generating Impervious Surface (PGIS)" shall mean those impervious surfaces <br /> considered to be a significant source of pollutants in stoi water runoff. Such surfaces <br /> include those which are subject to: vehicular use; industrial activities; or storage of erodible <br /> or leachable materials, wastes, or chemicals, and which receive direct rainfall or the run-on <br /> or blow-in of rainfall. Erodible or leachable materials, wastes, or chemicals are those <br /> substances which, when exposed to rainfall, measurably alter the physical or chemical <br /> characteristics of the rainfall runoff. Examples include erodible soils that are stockpiled, <br /> uncovered process wastes,manure, fertilizers, oily substances, ashes,kiln dust, and garbage <br /> dumpster leakage. Metal roofs are also considered to be PGIS unless they are coated with <br /> an inert,non-leachable material (e.g., baked-on enamel coating). <br /> A surface, whether paved or not, shall be considered subject to vehicular use if it is <br /> regularly used by motor vehicles. The following are considered regularly-used surfaces: <br /> roads, unvegetated road shoulders, bike lanes within the traveled lane of a roadway, <br />