ResolutiontoAuthorizeProfessionalServicesAgmtforEAatBowersField

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3) Elevations on pavement areas, and for drainage structures shall be accurate to 0.01 feet and natural ground elevations shall be accurate to 0.10 feet. 4) The survey map shall locate the airport property line; however, this is not a boundary survey. 5) The survey shall map flagged environmental areas (including wetlands), if any, The survey shall incorporate, as much as possible, any previously collected data made available by the County. Products: Using the data collected from survey, a digital terrain model will be developed of the area surveyed. A contour map will be developed at a scale of 1"=50' for use in the design. The contour interval shall be 0.5 feet. A PDF and CAD version of the mapping, showing all existing features, will be provided for the Sponsor and FAA. Task 2.5 - Preliminary Design (25%) Objective: Complete 25% preliminary design of the proposed improvements to provide sufficient information related to the location, limits, material quantities, and construction requirements of the proposed improvements to perform evaluations based on the various impact categories. Approach: The Consultant will utilize the plan view of the preferred alternative for the proposed improvements and the survey base map to complete a 25% preliminary design of the proposed improvements. The level of design will allow the consultant to identify grade constraints and limits and ensure that FAA design standards can be met to complete the proposed improvements. The preliminary design will also include identification of cut/fill grading limits, material quantities, and a detailed construction cost estimate. The task will also include the following: Review past mapping, plans, documents and other available information pertaining to the project. Make recommendations and prepare the preliminary design alternatives for surface and subsurface drainage within the direct and indirect study area. Drainage improvements will be developed forthe identified airfield projects outlined in the scope, as well as any necessary improvements within the airport property boundary or indirect study area to alleviate airfield improvements from worsening flood conditions off property. Drainage features may include inlets, pipes, underdrains, ditches, swales, manholes, and other appurtenances to provide site drainage. Prepare preliminary design alternatives for runways, taxilanes, and taxiways. Plan and profiles, and additional design items including pavement, lighting, signage, NAVAIDs, and other associated facility improvements, will be designed per the appropriate Aircraft Approach Category (AAC) and Airplane Design Group (ADG). Runway 11-29 will be designed as a B -ll. Runway 7-25 will be designed as a B -I. Project assumes implementation (by FAA Flight Procedures) of new straight -in instrument approach procedure (IAP) to Runway 11, and design for upgrading of Runway markings from basic to non -precision (NP), and addressing the Magnetic Variation (MagVar) change on Runway 11-29. Bowers Field Airport Improvements EA April 27, 2013