Whereas Section 6 of Ordinance 497, amending Ordinance 430 by creating Article XXa, PUD District, establishes certain regulations and guidelines pertaining to accompanying information required on a final site plan and final site plan documents. Now therefore, the following conditions, restrictions, and regulations are adopted as a part of this approval, to wit:
A. Plan Requirements: The plan shall incorporate a maximum of three hundred fifty two (352) residential dwelling units intended for owner occupancy, and which shall be generally distributed by design criteria as follows:
1. As shown on the sketch plan, there shall be incorporated at least one tier of single-family detached dwelling lots bordering the north boundary of the plan, such building lots being a minimum of eighty feet (80') in frontage, and ten thousand (10,000) square feet in area.
2. There shall be incorporated generally, a second horizontal tier of single-family detached building lots which shall be directly south of the aforementioned lots noted in subsection 1a of this Section. This second tier of lots shall be a minimum of seventy five feet (75') in frontage, and eight thousand five hundred (8,500) square feet in area.
3. All single-family detached building lots both north and south of Stonebridge Road as shown on the plan, and other than as noted above, shall be sixty feet (60') minimum frontage.
4. All bi-attached structures shown as part of the plan shall incorporate an approximate one hundred sixteen (116) total dwelling units, shall be located towards the far end of the project southerly of Stonebridge Road, and shall be built upon lots with a minimum of seventy feet (70') in width and eight thousand five hundred (8,500) square feet in area; provided, that said lots after being built upon, may be further divided down the common wall of the structure and common center line of the lot to provide a separate ownership parcel attributable to each dwelling unit.
B. Setbacks: All structures shall maintain a minimum twenty five foot (25') front yard setback, except those adjoining 50th Street, 39th Street, and Stonebridge Road. Structures bordering 39th Street and Stonebridge Road shall maintain a minimum thirty foot (30') front yard setback. All structures along 50th Street shall maintain a minimum of thirty five feet (35') in front yard setback.
1. All single-family detached structures shall, with the exception of corner lots, maintain a minimum side yard of seven feet (7') for any one side, with a total of fifteen feet (15') for both sides.
2. To all corner lots shall be added an additional twenty feet (20'), over and above those minimum lot frontages noted in Section 013-03, subsection A1 of this Ordinance. No structure located on a corner lot shall be set closer than twenty five feet (25') to a public right-of-way.
3. All bi-attached units shall maintain a minimum total side yard setback of ten feet (10'), with not less than five feet (5') on any one side.
4. Rear yard setbacks shall be a minimum of thirty five feet (35') for a single-family detached structure, and thirty feet (30') for bi-attached structures.
C. Elements Included: The Western Hills Creek natural floodway/parkway area shall incorporate the following elements:
1. The reserved floodway/parkway shall be a minimum of one hundred forty feet (140') in width unless a greater area of dimension be required to provide future trunk utilities, or be required for flood protection based upon information supplied to the City as part of the consultant study now being prepared on the creek.
2. The one hundred forty foot (140') width shall, to the extent possible, be centered upon the existing creek channel.
3. The parkway shall be dedicated to the City at no cost concurrent with the platting of the adjoining property. Prior to said dedication, however, the owner/developer shall provide engineering plans to the City's specifications and construct such improvements as shall be required to bring the channel to a nonerodible slope and velocity. Nonerodible slope is defined as a maximum slope of one-half percent (0.50%). Nonerodible velocity is defined as five feet (5') to seven feet (7') per second. This may be achieved by use of gabion drop structures, street crossing structures, or such other method of good engineering practice as shall be approved by the City Engineer.
4. Prior to dedication, the developer shall remove all fallen trees, debris, and other obstructions from the creek exclusive of landscaping to be preserved. All areas of the creek including those disturbed by construction, cleaning, or grading in conjunction with adjoining lots, shall be seeded by the developer prior to dedication to the City.
D. Additional Regulations:
1. The Western Hills Creek crossing as part of Stonebridge Road shall be designed and constructed by the developer at no cost to the City of West Des Moines. Said structure as designed shall be capable of conveying without the creation of more than one foot (1') of backwater, the discharge quantity of a 100-year return frequency storm.
2. An approximate one and sixty-five hundredths (1.65) acre rectangular parcel in the northeast corner adjoining Western Hills School, shall be dedicated without cost to the West Des Moines School Board if the Board shall desire to accept the same. Prior to dedication, and concurrent with development of the adjoining plat, the petitioner shall using standard West Des Moines engineering design criteria construct a storm sewer capable of conveying drainage through the property. And, prior to dedication, the developer shall remove all debris exclusive of landscaping to be preserved, grade, and hydroseed the parcel in a manner sufficient to assure initial growth and allow maintenance with standard school mowing equipment.
3. All structures adjoining any drainage way shall be designed such that all openings remain above the 100-year return frequency flood occurrence, and at a level as shall be determined by State, Federal or local law.
4. Before development shall commence on any bi-attached structure, unit floor plan design concepts shall be submitted to and approved by the Planning and Zoning Commission and City Council. Said design concept shall also incorporate exterior construction materials and elevations of unit exteriors.
5. West Des Moines subdivision engineering design standards shall apply to all sections and areas of the development plan, including outlet storm sewers to Jordan Creek. All work to be accomplished by the developer shall be in accordance with plans and specifications submitted and approved by the City. The developer shall pay all construction and engineering costs for all streets, storm sewers, sanitary sewers, water, creek improvements, creek crossing structures, City-owned utilities, and other improvements within the planned unit development, with the same being in accordance with the specifications, ordinances and adopted resolutions of the City of West Des Moines. It is recognized that changes in the street layout as shown on the sketch plan may be made at the time of platting by the City Council or the developer, if said change is deemed to be the best interests of the City of West Des Moines. (Ord. 633, 3-5-1979)