The goal of this Assessment is to evaluate existing road and drainage conditions, develop preliminary engineering solutions, and identify high-priority segments for future construction-ready design. The City is looking to conduct a comprehensive assessment of current road conditions and drainage systems. The selected consultant will provide topographic surveying, drainage analysis, and preliminary engineering designs to identify areas needing improvement. Based on these assessments, the City will work with the consultant to prioritize road segments for further development. This Assessment is intended to guide future improvements and enhance long-term road performance and drainage efficiency across the community. 1. Topographic Surveying • Survey approximately 20 miles of gravel roads using high-accuracy RTK GNSS and/or total station equipment. • Collect centerline and cross-sectional profiles at appropriate intervals, including road crown, shoulder edges, ditch lines, and driveway tie-ins. • Locate, map, and assess the condition of all culverts, inlets, outlets, storm infrastructure, and any visible utility features. • Deliver CAD and GIS-compatible base maps, terrain models, and raw survey files. 2. Drainage Analysis • Perform hydrologic and hydraulic modeling of road segments to identify flow patterns and capacity issues. • Evaluate roadside ditch effectiveness, low points, overflow routes, and cross-culvert adequacy. • Identify locations with significant erosion, sedimentation, or water pooling. • Recommend design slopes, ditch profiles, and culvert replacements or additions as needed. 3. Design and Recommendations • Develop preliminary design for drainage improvements in accordance with Municipality of Anchorage Standard Details with a focus on cost-effectiveness and constructability. • Provide preliminary engineering design including typical details, road cross-sections, culverts, and ditch grades. • Recommend materials and design standards suited for Unalaska’s environment. • Propose phased implementation plans if full project construction will occur in stages. 4. Reports and Supporting Documents • Provide a comprehensive engineering report summarizing all survey results, drainage analysis, and design recommendations. • Provide prioritization recommendations for road segments in need of the most urgent repairs, provide construction sequencing recommendations, and include detailed cost estimates. 5. Public Presentations • Provide a clear, visually supported virtual presentation to the Unalaska City Council highlighting existing issues, recommended improvements, and project status.
