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•, ' 4 September 2012 1340 Baldur Park Road Page 9 of 9 all development activities that may affect the wetlantl and the wetland buffer area have been finished and adequate vegetative cover has been establishetl at which time the fencing must be removetl. e. All structures must have a minimum basement floor elevation not less than one foot above the 100-year flood elevation. f. All hard-surface runoff must be treated in accordance with the requirements of the city and the appropriate watershed tlistrict. Treatment may inclutle site retention, skimmers, weirs or setlimentation ponds of appropriate scale. Structures and ponds serving this purpose must be properly maintained and serviced by the property owner. g. Discharge into the wetlands must occur at a rate no greater than allowed by the city engineer in accordance with the city's surface water management plan and the appropriate MCWD requirements. (2) Setbacks. a. All builtlings(principal and accessory), must be setback at least 20 feet from the upslope edge of the wettand buffer. Exceptions: Play structures (including sport court type structures), grade-level decks, patio slabs, driveways,sidewalks and parking lots. b. A setback from the buffer area is not required for overheatl utility poles and lines that are less than two feet in diameter, underground utility lines and distribution equipment, light potes, traffic signals, traffic regulatory signs, mailboxes, entrance monuments meeting section 78-1405(8) and other equipment that provides an essential public service. c. A setback from the buffer area is not required for fences or retaining walls. (3) Nonconformities. a. Effect of wetland boundary expansion. An existing structure, driveway or parking area meeting the required setback from a city-designated wetland boundary or buffer area is considered a legal nonconforming development if a later wetland delineation or implementation of a wetland buffer shows that the wetland or its buffer is closer than the required setback. b. Exisfing nonconformifies. An existing structure, driveway or parking area that tloes not meet the required setback from a city-designated wetland boundary or buffer area, is considered a legal nonconforming development. c. Avoiding future nonconformities. In order to avoitl the creation of future nonconformities, in situations where development, redevelopment or construction activity does not trigger the establishment of a buffer, the following setbacks shall apply: 1. All new builtlings shall maintain a setback from a delineated wetland boundary equivalent to the width of the buffer area per the chart in section 78-1605(c)plus the required 20 foot buffer setback. 2. All new non-structural impervious surfaces and those structures listed as exceptions in section 78- 1608(2)(a) above shall maintain a setback from the delineated wetland boundary equivalent to the width of the buffer area per the chart in [section]78-1605(c). d. Buffer flexibility. Where existing structures or surfaces are located within an area that would be requiretl for establishment of a buffer under this article, alternative methods of wettand protection may be approved by the city council to avoid creating unreasonable impacts on the existing use of a property. Such methods may include but are not limited to buffer width averaging, redirection of drainage to an area where buffer is feasible, use of rain gardens,cisterns or rain barrels,etc. (Ord. No. 28 3rd series, § 1, 8-22-2005)