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2. Have a minimum setback distance from the base of the monopole of 500 feet from any residential zoned property. c. Shall not be located between a principal structure and a public street, unless the City determines that such a location would lessen the negative impacts of such a WECS on nearby properties. Subd. 3. Roof Mounted WECS: a. Number: 1. Large Roof Mounted WECS. The maximum number of large roof mounted WECS shall be approved through the conditional use permit process in accordance with Chapter 1125.01 Subd. 3. 2. Small Roof Mounted WECS. No more than three (3) roof mounted small WECS shall be installed on any rooftop. b. Height: 1. Large Roof Mounted WECS: Total height of not more than twenty-five (25) feet, measured from the top of the roof to the blade tip at its highest point of travel. 2. Small Roof Mounted WECS: Total height of not more than twenty-five (25) feet, measured from the top of the roof to the blade tip at its highest point of travel. c. Placement: Roof mounted WECS must be erected above the roof of a building or structure. The mounts associated with the WECS may extend onto the side of the building or structure. Subd. 4. General Standards. The following provisions will apply to all WECS erected under the provisions of this ordinance: a. Rotor Clearance. Blade arcs created by the WECS shall have a minimum of thirty (30) feet of clearance over any structure or tree within a two hundred (200) foot radius, and maintain at least twenty (20) feet of clearance between their lowest point and the ground. b. Rotor Safety. Each WECS shall be equipped with both a manual and automatic over speed controls to limit the blade rotation within design specifications. c. Color and Finish. All wind turbines and towers shall be white, gray, or other non-obtrusive color. Finishes shall be matte or non-reflective. d. Tower Access. To prevent unauthorized climbing, WECS towers must comply with one of the following provisions: 6