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has been provided by the developer to ensure such maintenance will <br />continue in perpetuity. <br />C. Building standards. <br />1. Principal structures within open space PUDs shall not exceed 2 1/2 stories or <br />35 feet in height. <br />2. It is desired that the structures within neighborhoods convey a particular <br />architectural style with similar building components, materials, and roof <br />pitches. The PUD overlay ordinance crafted for each individual open space <br />PUD should establish minimum architectural standards for the <br />neighborhood. <br />3. All wells shall be located a minimum of 50 feet from septic tanks and septic <br />drain fields. <br />4. The width of an attached garage shall not exceed 40 percent of the width of <br />the entire principal building facade (including garage) fronting the primary <br />street. <br />D. Landscaping standards. <br />1. A landscape plan for the entire site is required and shall consist of at least ten <br />trees per building site; and trees shall not be not less than 1.5 inches in caliper <br />measured at 54 inches above grade level. <br />2. Boulevard landscaping is required along all streets to consist of at least one <br />tree per every 30 feet or placed in clusters at the same ratio. <br />E. Impervious surface standards. The maximum impervious surface allowable within <br />an open space planned unit development shall be 25 percent of the land area not <br />dedicated as preserved open space subject to the following: <br />1. Impervious surfaces created by roads, trails, and other planned impervious <br />improvements shall count against the maximum allowed impervious <br />coverage. <br />2. Remaining allowed impervious surface acreage may be distributed between <br />the planned building sites, and maximums for each lot shall be clearly <br />documented within the overlay district ordinance governing the <br />development. <br />F. Trail and sidewalk standards. A trail system or with sidewalks shall be established <br />within open space planned unit developments in accordance with the following: <br />1. The linear footage of sidewalks and trails provided shall be at least equal in <br />length to the sum of the centerline length of all public roads within the <br />development. <br />a. A trail or sidewalk shall be constructed along the lot frontage on one <br />(1) side of the road. <br />b. Additional asphalt trails shall be required to create connections to <br />other developments and public places. Said trails may be required to <br />exceed the sum of the centerline length at the discretion of the <br />community development director or city engineer. <br />2. All trails shall be constructed of asphalt or concrete in compliance with the <br />standard city design for trails.