Design Report. The Engineer will coordinate with the Owner to develop a “fleet-mix” of design aircraft documenting estimated existing and future use of type, weight, wheel gear configurations, and general grouping of aircrafts, for the life of the intended reconstructed airport pavements (20-years). Using this information, the Engineer will analyze the existing soil conditions, determine various pavement sections that meet FAA design criteria for AC150/5320-6F and FAARFIELD, estimate costs for each pavement option, and make a recommendation of the most economical section (over the life-cycle of the pavement) to the Owner. Development options and phasing triggers will be proposed for Owner action. Key issues to address include: existing and ultimate airspace clearance, residential / non-compatible land uses in or adjacent to existing and ultimate RPZs, signing / marking clarity. This will not be a Master Planning effort but will provide documentation of potential options and Owner preferences for both a rehabilitation and an “ultimate” pavement footprint. The Engineer shall consult with the Owner and airport manager to determine the “critical taxiing aircraft” (FAA Taxiway Design Group or TDG) using and anticipated to use the airport to justify inclusion or exclusion of taxiway fillets. If justified, the fillets will be designed using a Computer Aided Design (CAD) program, Autodesk vehicle tracking, utilizing cockpit over centerline steering in accordance with Section 406 Curves and Intersections of AC 150/5300-13A - Change 1 with the Errata sheet. Up to four (4) pavement section alternatives will be investigated by the Engineer with benefits, drawbacks, and approximate life cycle costs highlighted for the Owner. Pavement design parameters will be coordinated with and approved by the FAA and Owner prior to investigating pavement section alternatives. Rehabilitation options may include partial mill and overlay, mill & haul, add & pulverize, and full reconstruction. A preferred pavement section(s) will be selected by the Owner, in coordination with the FAA. Following FAA approval, the selected design and alternatives will be included in a Design Report. Construction Plans will be prepared as part of a future Task Order(s). The Engineer will review FAA circulars, briefs, and regulations to determine the bounds on design options. Both proposed connection elevations and compatibility with future and ultimate developments will be identified and added to the design constraints. Several iterations of design grades will be utilized to produce a highly functional design while reducing material movement. If a mass-balanced solution is not possible, or results in excessive haul lengths, the Engineer will locate a borrow / waste site on the airport property that will be compatible with planned ultimate development. This project’s pavement reconstruction could modify the current drainage patterns. Site drainage will be reviewed relative to its current functionality and existing needs, as well as mitigating impacts of proposed pavement rehabilitation. The Engineer will collect sufficient topographical data to identify deficiencies in the existing overland flow patterns, and add any ditches, pipes, or French drains necessary. Usefulness of drainage structures, their extents and configuration will be reviewed and presented to the Owner and FAA for determination of inclusion/exclusion. Concept-level design only is included in this Task Order, Construction- level design of an edge drain system will be included in a future Task Order, if necessary. After completion of the Geotechnical Report and Design Report, and selection of the pavement rehabilitation approach, the Engineer will develop and calculate preliminary design quantities and prepare a comprehensive Preliminary Engineer’s Estimate. The Engineer’s estimate will be completed to aid the Owner and FAA in determining the anticipated funding required for the proposed improvements. Various funding scenarios will be developed to identify FAA, MT Aeronautics, and Sponsor funds required to complete the project(s). The Design Report will be prepared with suggested splits into components to be offered as Base Bid and Additive Alternates, to best utilize available funds based on ultimate bid prices. The Engineer will prepare and distribute a Design Report summarizing the data collected, the options considered, the likely costs, and the selected alternatives. This Report will include the complete Geotechnical Report and other supporting documentation. It will document the pavement section, edge drain (lack of) need, pavement grades, surface drainage, project quantities and estimated costs. The Report will record the Owner’s priorities for the proposed project components and set the groundwork for producing a bid package of airport improvements. The Engineer will provide a draft Design Report to the Owner for review and approval. Once approved, the Engineer will produce and distribute electronic and/or paper copies of the final Design Report for distribution to the Owner and the FAA.
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Design Report. An engineering design report will be prepared in accordance with the FAA’s Northwest Mountain Airports Regional Engineering Guidance 620-04 and submitted to the Helena ADO for review and approval. Included in the design report will be a Construction Safety and Phasing Plan (CSPP) and associated Safety Plan Compliance Document (SPCD). The Design Report shall be prepared regardless of funding source for this project, as future eligibility of maintenance will require the current design meets FAA standards. The Engineer will coordinate with the Owner and USFS to develop a “fleet-mix” of design aircraft documenting estimated existing and future use of type, weight, wheel gear configurations, and general grouping of aircrafts, for the life of the intended reconstructed proposed airport pavements (20-years). Using this information, the Engineer will analyze the existing soil conditions, determine various pavement sections that meet FAA design criteria for AC150/5320-6F 6G and FAARFIELD, estimate costs for each pavement option, and make a recommendation of the most economical section (over the life-cycle of the pavement) to the Owner. Development options and phasing triggers will be proposed for Owner action. Key issues to address include: existing and ultimate airspace clearance, residential / non-compatible land uses in or adjacent to existing and ultimate RPZs, signing / marking clarity. This will not be a Master Planning effort but will provide documentation of potential options and Owner preferences for both a rehabilitation and an “ultimate” pavement footprint. The Engineer shall consult with the Owner and airport manager to determine the “critical taxiing aircraft” Hot Mix Asphalt (FAA Taxiway Design Group or TDG) using and anticipated to use the airport to justify inclusion or exclusion of taxiway fillets. If justified, the fillets will be designed using a Computer Aided Design (CAD) program, Autodesk vehicle tracking, utilizing cockpit over centerline steering in accordance with Section 406 Curves and Intersections of AC 150/5300-13A - Change 1 with the Errata sheet. Up to four (4HMA) pavement section and Portland Cement Concrete (PCC) pavement sections alternatives will be investigated by the Engineer with benefits, drawbacks, and approximate life cycle costs highlighted for the Owner. Pavement design parameters will be coordinated with and approved by the FAA and Owner prior to investigating pavement section alternatives. Rehabilitation options may include partial mill and overlay, mill & haul, add & pulverize, and full reconstruction. A preferred pavement section(s) will be selected by the Owner, in coordination with the FAA. Following FAA approval, the selected design and alternatives will be included in a Design Report. Construction Plans will be prepared as part of a future Task Order(s). The Engineer will review FAA circulars, briefs, and regulations to determine the bounds on design options. Both proposed connection elevations and compatibility with future and ultimate developments will be identified and added to the design constraints. Several iterations of design grades will be utilized to produce a highly functional design while reducing material movement. If a mass-balanced solution is not possible, or results in excessive haul lengths, the Engineer will locate a borrow / waste site on the airport property that will be compatible with planned ultimate development. This project’s pavement reconstruction could modify the current drainage patterns. Site drainage will be reviewed relative to its current functionality and existing needs, as well as mitigating impacts of proposed pavement rehabilitation. The Engineer will collect sufficient topographical data to identify deficiencies in the existing overland flow patterns, and add any ditches, pipes, or French drains necessary. Usefulness of drainage structures, their extents and configuration will be reviewed and presented to the Owner and FAA for determination of inclusion/exclusion. Concept-level design only is included in this Task Order, Construction- level design of an edge drain system will be included in a future Task Order, if necessary. After completion of the Geotechnical Report and Design Report, and selection of the pavement rehabilitation approachsection and layout, the Engineer will develop and calculate preliminary design quantities and prepare a comprehensive Preliminary Engineer’s Estimate. The Engineer’s estimate will be completed to aid the Owner and FAA in determining the anticipated funding required for the proposed improvements. Various funding scenarios will be developed to identify FAA, MT Aeronautics, and Sponsor funds required to complete the project(s). The Design Report will be prepared with suggested splits into components to be offered as Base Bid and Additive Alternates, to best utilize available funds based on ultimate bid prices. The Engineer will prepare and distribute a Design Report summarizing the data collected, the options considered, the likely costs, and the selected alternatives. This Report will include the complete Geotechnical Report and other supporting documentation. It will document the pavement section, edge drain (lack of) need, pavement grades, surface drainage, project quantities and estimated costs. The Report will record the Owner’s priorities for the proposed project components and set the groundwork for producing a bid package of airport improvements. The Engineer will provide a draft Design Report to the Owner for review and approval. Once approved, the Engineer will produce and distribute electronic and/or paper copies of the final Design Report for distribution to the Owner and the FAA.
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Sources: Task Order Agreement