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Alternative Energy Systems Ordinance Planning Commission Recommendation September21, 2009 (e) Abandonment. If the ground source heat pump system remains nonfunctional or inoperative for a continuous period of one year, the system shall be deemed to be abandoned and shall constitute a public nuisance. The owner shall remove the abandoned system at their expense after a demolition permit has been obtained in accordance with the following: (1) The heat pump and any external mechanical equipment shall be removed. (2) Pipes or coils below the land surface shall be filled with grout to displace the heat transfer fluid. The heat transfer fluid shall be captured and disposed of in accordance with applicable regulations. The top of the pipe, coil or boring shall be uncovered and grouted. (3) Lake ground source heat pump systems shall be completely removed from the bottom of the body of water. (f) Permits. A building permit and interim conditional use permit, if required, shall be obtained for any ground source heat pump system prior to installation. Borings for vertical systems are subject to approval from the Minnesota Department of Public Health. 24-405 Wind energy systems. (a) Zoning districts. Residential wind turbines in accordance with the standards in this section are permitted accessory uses on lots at least 3 acres in size in the R-1, Urban Reserve, and the R-2, Rural Estate; on lots at least 20 acres in size in the R-4, Urban Residential zoning districts; and on lots at least 1.5 acres in size in the B-2. General Business, and the 1-1, Light Industrial provided the lot does not abut a residential zoning district. Wind energy systems are not permitted in any other zoning districts. (b) Szandards. (1) Number. No more than one wind energy system is permitted per parcel. (2) Height. In the R-1, Urban Reserve, zoning district, a maximum hub height of 60 feet is allowed as a pennitted accessory use; additional height, up to 120 feet in total height, may be permitted as an interim conditional use in accordance with Section 24- 207. In the R-2, Rural Estate, R-4, Urban Residential. B-2, General Business. and I-1, Light Industrial zoning districts, a maximum hub height of 45 feet is allowed as a permitted accessory use. Additional height, up to 75 feet in total height. may be pennitted as an interim conditional use in accordance with Section 24-207. (3) Blade length. A maximum blade length of 15 feet is permitted. (4) Roof mounting. Roof mounted wind turbines are not permitted. (5) Setbacks. The base of the wind turbine tower shall be set back from all property lines a distance equal to the hub height. Wind energy systems shall not be installed in the ;)K