The following information shall be submitted as part of the first request for development authorization, including, without limitation, approval of a preliminary subdivision plat, permit for land disturbing activity, development plan approval, or permit for a building, road, or driveway for anything other than a single-family dwelling. In order to reduce costs to applicants, the topographic survey, soils report, hydrological report and plan, and geotechnical analysis and report need not address areas not proposed for development. Surveys, reports, plans and analyses required herein shall in all cases be prepared by a qualified licensed professional.
(1) Topographic survey. A topographic survey of the project site shall be required for preliminary subdivision plat approval. Notes and details of existing terrain shall be included in the required topographic information, as needed to adequately portray the natural and manmade features of the land, as well as its elevations. A topographic survey may be required by the community development director for any other application for land disturbing activity or building approval where reliable data on existing topography including county GIS maps or other topographic maps which may be available do not provide sufficient detail to administer the requirements of this chapter. Said topographic survey, if required by this section or by the community development director pursuant to this section, shall provide contour intervals of no more than five feet unless otherwise approved by the community development director.
(2) Soils report. This report shall include conclusions and recommendations regarding the effect of soil conditions on the proposed development. The report may use the soil survey prepared and published by the natural resources conservation service for the county, as its basis, although site-specific soil tests may be required at the discretion of the community development director.
(3) Hydrology report and plan. This report shall include a complete description of the hydrology of the site, including the presence and location of springs, seeps and streams and the classification of streams as perennial, intermittent or ephemeral. The report shall also include conclusions and recommendations regarding the effect of hydrological conditions on the proposed development, and the capability of the site to be developed. A hydrological control plan shall also be required. At minimum, said plan shall show and take into account the direction of flow within the local drainage basin; all natural drainage channels directed toward and away from the site within 50 feet of the perimeter of the site; and other natural drainageways which may affect or be affected by the development proposal. Alterations of natural drainageways shall be prohibited except for approved road crossings and drainage structures. Natural drainageways shall be rip-rapped or otherwise stabilized below drainage and culvert discharge points for a distance sufficient to convey the discharge without channel erosion. Special notations shall be included which highlight details of the terrain, existing natural surface drainage and areas subject to seepage or spring flow.
(4) Geotechnical analysis and report. This analysis and report shall address the existing geology, topographic and hydrologic conditions of the site, including an evaluation of the ability of the site to accommodate the proposed activity. Such analysis and report shall contain a professional opinion regarding slope stability, soil- bearing capacity, the potential for landslide or other geological hazards and their potential impact on structures or surrounding properties, and any other pertinent information. The analysis and report shall then be used by a qualified licensed professional engineer or qualified licensed architect to create a design that is structurally sound and addresses the design elements outlined in this article. Upon completion of all improvements shown on approved plans but prior to the issuance of any final approval of improvements by the town, the applicant shall submit a declaration by the design engineer or architect that the design was provided in substantial accordance with the geotechnical analysis. The applicant shall also submit a declaration by a qualified licensed professional engineer or qualified licensed architect that the work was completed in accordance with approved plans.
(5) Assessment. A written assessment of how the project has been designed to minimize the negative impacts of development on the environment of the mountain or hill.
(Code 1989, § 92.204; Ord. of 11-18-2008; Ord. of 8-9-2011)