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water runoff. Impervious surface coverage within any lot shall not exceed twenty five percent (25%) of the tier area, except that for commercial PVDs thirty five percent (35%) impervious surface coverage may be allowed in the first tier of general development lakes with an approved storm water management plan and consistency with this Chapter. 5. Centralization and Design of Facilities: Centralization and design of facilities and structures shall be done according to the following standards: a. Planned unit developments shall be connected to publicly owned water supply and sewer systems; b. Dwelling units or building sites shall be clustered into one or more groups and located on suitable areas of the site. They shall be designed and located to meet or exceed the following dimensional standard for the relevant shoreland classification: setback from the ordinary high water level, elevation above the surface water features, and maximum height. Setbacks from the ordinary high water level shall be in accordance with subsection 1016.14B1 of this Chapter for developments with density increases; c. Shore recreation facilities, including but not limited to swimming areas, docks, and watercraft mooring areas and launching ramps, shall be centralized and located in areas suitable for them. Evaluation of suitability shall include consideration of land slope, water depth, vegetation, soils, depth to ground water and bedrock, or other relevant factors. The number of spaces provided for continuous beaching, mooring, or docking of watercraft shall not exceed one for each allowable dwelling unit or site in the first tier (notwithstanding existing mooring sites in an existing commercially used harbor). Launching ramp facilities, including a dock for loading and unloading equipment, may be provided for use by occupants of dwelling units or sites located in other tiers; d. Structures, parking areas, and other facilities shall be treated to reduce visibility as viewed from public waters and adjacent shorelands by vegetation, topography, increased setbacks, color, or other means acceptable to the City, assuming summer, leaf -on conditions. Vegetative and topographic screening shall be preserved, if existing, or may be required to be provided; e. Accessory structures and facilities, except water oriented accessory structures, shall meet the required principal structure setback and must be centralized; and f. Water -oriented accessory structures and facilities may be allowed if they meet or exceed design standards contained in Section 1016.15 of this Chapter and are centralized. (Ord. 1156, 12-12-94) 1016.25: GRADING, FILLING AND LAND ALTERATION: A. Permit Required: No person, firm or corporation may engage in any excavation, grading, surfacing or filling of land in the City without first securing a permit as set forth in this Section. 1. Permit from City Engineer/Public Works Director: A permit is required from the City Engineer/Public Works Director or designee, for any of the following activities: a. Placement of or grading of more than ten (10) cubic yards of material on steep slopes adjacent to lakes and wetlands or within the shore or bluff impact zones. b. Placement of or grading of more than fifty (50) cubic yards of earthen material anywhere in the City. c. Where filling or grading occurs within ten feet (10') of a property line or when such activity alters the drainage patterns of adjacent properties. 2. Permit from City Council: A permit from the City Council is required for any projects meeting the following criteria: a. Any fill, grading, or drainage of a public water or a wetland, provided the City Council first determines that the project is either exempt from the 1991 Wetlands Conservation Act or certifies the replacement of any loss of wetland area, values and functions in accordance with Minnesota Rules, chapter 8420 as amended. Questions relating to wetland type, location, area, functions and values must be referred to the technical advisory panel established by Minnesota Statutes section 103G.2242 as amended. b. For any filling or excavating on developed land zoned R-1 or R-2 where the site is less than one acre and the fill or excavation exceeds five hundred (500) cubic yards. c. For any filling or excavating on developed land zoned R-1 or R-2 where the site is one acre or greater and the proposed fill/excavation exceeds one thousand (1,000) cubic yards. d. For any filling or excavating on undeveloped land zoned R-1 or R-2 where the site is less than one acre