8.2 SR 07-07-2025 - Laserfiche WebLink

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U S 1 0 & 1 6 5 th J -T u r n I m p r o v e m e n t s | E l k R i v e r B O L T O N & M E N K | 2 Task 4: Preliminary Design 4.1 Finalize Concept Development We will expand upon and finalize the recommended concept established within the ICE study. Our team will review the general footprint, operations, capacity, property impacts, and access conditions. We will balance efforts to accommodate the appropriate design vehicle based on direction from MnDOT with the need to minimize impacts and project costs. Our team will also complete an iterative design process to finalize construction limits. 4.2 Preliminary Drainage Design Our team will assess existing surface water management features. Drainage areas and inplace facilities will be mapped to understand patterns. We will determine surface water drainage, ponding, and erosion control measures needed with modifications to the existing environment. We will create the required drainage report to meet State Aid requirements verifying spread and pipe capacity are met. The project is not anticipated to create more than 1 acre of impervious so it shouldn’t require treatment per the City’s MS4 or State standards. If MnDOT requires additional permitting or rate control, these additional services could be determined based on any added requirements. 4.3 Evaluate Potential Construction Staging/Traffic Control Plan During the preliminary design process, our team will analyze how to best construct this J-Turn. We will estimate project working days, create staging concepts, and identify potential traffic control concepts. We will also work with the project team to reach a decision on staging. 4.4 Topographic Survey We will perform field control survey and create a base map identifying existing above and below ground infrastructure features in electronic format. This base map will be used as the basis and background for final design. We will also fly a drone over the site which will produce a georeferenced orthomosaic image. 4.5 Prepare Geometric Layout Once the concept development process is finalized, we will develop a Level 1 Geometric Layout (30% design level), including plan, profile, cross sections, and construction limits for review and approval by MnDOT and the City. 4.6 Prepare Environmental Documents Once the concept development process is finalized, we believe an ENM Summary table will be needed. This is following the MnDOT TPDP Environmental Document Decision Tree. The environmental document will begin with the submittal of the early notification memo to MnDOT function groups for their review. If they determine a programmatic Catex is needed, we would complete that as additional services. 4.7 Identify Right-of-Way Needs Based on the geometric layout and staging analysis, we will determine if any additional right-of-way or easements are needs. 4.8 Cost Estimates We will prepare an engineer’s cost estimate with the final geometric layout. Our preliminary estimate for the construction cost of a J-Turn without signals is approximately $700,000. If the ICE report confirms the TIS recommendation that signals are needed at the 165th intersection as well as the south U-Turn we estimate that would add approximately $1,250,000 to the construction cost for a total of $1,9- 2,000,000. Task 4 Deliverables: Final concept, preliminary design, cross sections, profiles, typical sections, preliminary drainage plan, cost estimates, construction limits, Level 1 Geometric Layout, ENM summary table Phase 2: Final Design and Delivery Task 5: Final Design We will complete the detailed design of the proposed improvements consistent with City and MnDOT state aid design requirements, and in accordance with all state laws, rules, and regulations. Page 261 of 309