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{1(r "Equivalent Residential Unit (ERU)" means the average iMpervious <br /> area of residential property per dwelling unit located within the City as <br /> periodically determined and established as provided in this+Chapter, <br /> currently determined by the City to be 4,500 square feet of i�pervious <br /> surface area. The number of Equivalent Residential Units ( RU) on <br /> each property shall be calculated by the Public Works Director or <br /> designee based on the most recent aerial photograph available to the <br /> City of Decatur and/or impervious surface data from an apprPved Site <br /> Plan for the property. <br /> O "Erosion" (soil erosion) means the detachment and movement of soil <br /> or rock fragments by water, wind, ice or gravity. <br /> (mt) "Erosion and sediment control plan" means a written plan (�ncluding <br /> drawings or other graphic representations) that is designed to minimize <br /> the accelerated erosion and sediment runoff at a site during <br /> construction activities. <br /> ( u� "ERU Rate" means that portion of the Stormwater Service Charge that <br /> is based on the amount of impervious area on a property. <br /> (v) "Excavation" means any act by which organic matter, earth, sand, <br /> gravel, rock or any other similar material is cut into, dug, quarried, <br /> uncovered, removed, displaced, relocated or bulldozed and shall <br /> include the resulting conditions. <br /> (ew) "Existing development" means buildings and other structures and <br /> impervious area existing prior to Ordinance adoption. <br />