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105.12.1050 Open Space PUD Design Open space PUDs shall comply with all of the following minimum design standards unless modifications are authorized for consideration by the city council via a super-majority vote. For applying development standards, projects within an Open Space PUD shall be considered either a traditional or a cluster development. By default, a project shall be considered a traditional development. If 10 percent of the single-family lots within the proposed project do not meet the standards for a traditional development, the project shall be determined to be a cluster development. Cluster developments shall be located south of the Union Pacific RR line. A. Density. The maximum dwelling unit density within an open space planned unit development shall be 18 32 units per 40 acres of buildable land (0.45 0.8 dwelling units/acre) on the undeveloped parcel; however, the total number of dwelling units shall not exceed the density limitations contained in the comprehensive plan for open space preservation development. A 10% density bonus can be granted for sites with considerable wetlands or natural areas that reduce the buildable area or inclusion of stormwater reuse for irrigation. The maximum dwelling unit density within an open space planned unit development, in a Rural Single Family (RSF) future land use area, shall be 1 dwelling unit/acre. B. Lot design. Lot locations and configurations within open space planned unit developments shall be derived utilizing the following methodology. An applicant must be able to demonstrate how these steps resulted in the plan being proposed. 1. Soils analysis conducted. A certified septic designer or soils scientist shall complete a review of the soils on the site, and categorize all areas as highly suitable for septic systems, moderately suitable for septic systems, or poorly suited for septic systems. 2. Septic design identification. Based on the soils analysis, an applicant must identify whether the proposed development will be serviced by individual septic tanks and drain fields, or via a system of individual septic tanks which utilize one or more communal drain fields. a. If individual septic tanks and drain fields can be supported by the available soils and is the chosen methodology to serve the development, all proposed lots must be able to provide primary and secondary drain field sites on each lot (outside of drainage and utility easements), and must meet the minimum lot size standards outlined herein. b. If individual septic tanks which utilize a communal drain field (or fields) is the chosen methodology to serve the development, then the locations for communal drain fields shall be identified within the areas deemed the most suitable on the site for supporting septic utilities according to the soils analysis. All such areas shall be clearly denoted on provided plan sets. c. Low pressure sewer should only be allowed in special circumstances as deemed necessary by the city engineer. When low pressure sewer