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f. All hard-surface runoff must be treated in accordance with the requirements of <br /> the city and the appropriate watershed district. Treatment may include site <br /> retention, skimmers, weirs or sedimentation ponds of appropriate scale. <br /> Structures and ponds serving this purpose must be properly maintained and <br /> serviced by the property owner. <br /> g. Discharge into the wetlands must occur at a rate no greater than allowed by the <br /> city engineer in accordance with the city's surFace water management plan and <br /> the appropriate MCWD requirements. <br /> (2) Setbacks. <br /> a. All buildings (principal and accessory), must be setback at least 20 feet from the <br /> upslope edge of the wetland buffer. Exceptions: Play structures(including sport <br /> court type structures), grade-level decks, patio slabs, driveways, sidewalks and <br /> parking lots. <br /> b. A setback from the buffer area is not required for overhead utility poles and lines <br /> that are less than two feet in diameter, underground utility lines and distribution � <br /> equipment, light poles, traffic signals, traffic regulatory signs, mailboxes, entrance <br /> . monuments meeting section 78-1405(8) and other equipment that provides an <br /> � A essential public service. <br /> c. A setback from the buffer area is not required for fences or retaining walls. � <br /> (3) Nonconformities. � � ' <br /> a. Effect of wetland boundary expansion. An existing structure, driveway or parking <br /> area meeting the required set6ack from a city-designated wetland boundary or <br /> buffer area is considered a legal nonconforming development if a later wetland <br /> delineation or implementation of a wetland buffer shows that the wetland or its <br /> buffer is closer than the required setback. <br /> • b. Existing nonconformities. An existing structure, driveway or parking area that <br /> does not meet the required setback from a city-designated wetland boundary or <br /> buffer area, is considered a legal nonconforming development. <br /> c. Avoiding future nonconformities. In order to avoid the creation of future <br /> nonconformities, in situations where development, redevelopment or construction <br /> activity does not trigger the establishment of a buffer, the following setbacks shall <br /> aPp�Y� . <br /> 1. All new buildings shall maintain a setback from a delineated wetland <br /> boundary equivalent to the width of the buffer area per the chart in <br /> section 78-1605(c) plus the required 20 foot buffersetback. <br /> 2. All new non-structural impervious surtaces and those structures listed as <br /> exceptions in section 78-1608(2)(a)above shall maintain a setback from <br /> the delineated wetland boundary equivalent to the width of the buffer <br /> area per the chart in [section]78-1605(c). <br /> d. Buffer flexibility. Where existing structures or surtaces are located within an area <br /> that would be required for establishment of a buffer under this article, alternative <br /> methods of wetland protection may be approved by the city council to avoid <br /> creating unreasonable impacts on the existing use of a property. Such methods <br /> may include but are not limited to buffer width averaging, redirection of drainage <br />