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(3) On-site sewage treatment systems shall be set back from the ordinary high-water level in accordance with the <br /> setbacks contained in section 30-2022(a). <br /> L (4) All proposed sites for individual sewage treatment systems shall be evaluated in accordance with the criteria in <br /> subsections (b)(1) through (4) of this section. It shall be the responsibility of the applicant to provide sufficient <br /> soil borings and percolation tests from on-site field investigations. Evaluation criteria are as follows: <br /> a. Depth to the highest known or calculated groundwater table or bedrock. <br /> b. Soil conditions, properties, and permeability. <br /> c. Slope. <br /> d. The existence of lowlands, local surface depressions, and rock outcrops. <br /> (5) Nonconforming sewage treatment systems shall be regulated and upgraded in accordance with section 30- <br /> 1986(3). <br /> (Code 1982, § 904.08(8); Ord.No. 15-06, § 3, 2-17-2015) <br /> Secs. 30-2029-30-2040.-Reserved. <br /> Subdivision V.-Restrictions and Requirements <br /> Sec. 30-2041.-Subdivisions and platting. <br /> (a) Land suitability. Each lot created through subdivision, including planned unit developments authorized under section <br /> 30-2042, shall be suitable in its natural state for the proposed use with minimal alteration. Suitability analysis by the <br /> city shall consider susceptibility to flooding, existence of wetlands, soil and rock formations with severe limitations for <br /> development, severe erosion potential, steep topography, inadequate water supply or sewage treatment capabilities, <br /> near-shore aquatic conditions unsuitable for water-based recreation, important fish and wildlife habitat, presence of <br /> significant i ural land likefi to be harmful to the health, safety, or welfare of <br /> historic sites, or any other feature of the natural likely <br /> future residents of the proposed subdivision or of the community. <br /> (b) Conformance with subdivision controls. Subdivisions shall conform to all official controls of the city. A subdivision will <br /> not be approved where a later variance from one or more standards in official controls would be needed to use the <br /> lots for their intended purpose. In areas not served by publicly owned sewer and water systems, a subdivision will not <br /> be approved unless domestic water supply is available and a sewage treatment system consistent with sections 30- <br /> 2022 and 30-2028 can be provided for every lot. Each lot shall meet the minimum lot size and dimensional <br /> requirements of section 30-2021, including at least a minimum contiguous lawn area that is free of limiting factors <br /> sufficient for the construction of two standard soil treatment systems. Lots that would require use of holding tanks <br /> shall not be approved. <br /> (c) Information requirements. Sufficient information shall be submitted by the applicant according to section 30-353 for <br /> the city to make a determination of land suitability. In addition, the following information shall be provided in <br /> shoreland districts: <br /> (1) Adequate soils information to determine suitability for building and on-site sewage treatment capabilities for <br /> every lot, from the most current existing sources or from field investigations such as soil borings, percolation <br /> tests, or other methods; <br /> (2) Information regarding adequacy of domestic water supply; extent of anticipated vegetation and topographic <br /> alterations; near-shore aquatic conditions, including depths, types of bottom sediments, and aquatic vegetation; <br /> and proposed methods for controlling stormwater runoff and erosion, both during and after construction <br /> activities; <br /> (3) Location of 100-year floodplain areas and floodway districts from existing adopted maps or data; and <br /> (4) A line or contour representing the ordinary high-water level as established by the state department of natural <br /> resources, the toe and the top of bluffs, and the minimum building setback distances from the top of the bluff <br /> �.- and the lake or stream. <br /> (d) Dedications. When a land or easement dedication is a conditian of subdivision approva.1-the a..pprovaLahall provide <br /> easements over natural drainage or ponding areas for management of stormwater and significant wetlands. <br /> Page 17 <br />