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Designing Around Utilities

Our ultimate goal is the successful delivery of INDOT projects. To achieve this, we need to prevent utilities from delaying the project and increasing costs. By identifying and addressing utility conflicts early, we can reduce delays and avoid costly mistakes in utility placement.

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Designing Around Utilities

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  1. Designing Around Utilities

  2. Ultimate Goal • Our ultimate goal is successful delivery of the INDOT project. • To reach this goal, we need keep utilities from delaying the INDOT or LPA project and adding to the project cost in terms of delay claims. • Identifying utility conflicts EARLY and developing countermeasures will reduce cost and delay. Inaccurate placement is too costly.

  3. Designing around Utilities • For project success, identifying conflicts early in the process and communicating with utilities companies and designers is key.

  4. Plan the Work – Work the Plan • Set project goals and communicate to all project stakeholders • Identify the facilities within your project limits • Utilize 811 • Identify additional utilities during earlyfield checks • Make contact with utilities and discussproject goals

  5. Gather Information • Retrieve and incorporate GIS/Facility maps • Indiana GIS/USGS(http://gis.iu.edu/datasetInfo/topo.php) • Discuss facility size and apparent locations • Coordinate material/construction schedules and timing • Discuss average depths/heights of installation • Identify construction tolerances • Prioritize critical utility facilities • Update layouts with survey data when available Purpose & Need

  6. Understand Your Project Site • Discuss facility size and apparent locations • Discuss average depths/heights of installation • Identify construction tolerances • Prioritize critical utility facilities • Call in your Subsurface Utility partner Purpose & Need

  7. Vaults..why are they an issue?

  8. Overhead Transmission Lines..why?

  9. Types of Utility Conflicts • Conflicts may be in: Time or Space

  10. Conflict Review • The Conflict Review Letter is used to request that a Utility determine if there are conflicts between its facilities and the project, 105 IAC 13-3-3(a). In response to the letter, the utility company is required to respond with specific information, 105 IAC 13-3-3(a). This stage is not the time for a utility company to prepare a relocation work plan or a relocation drawing. •  The conflict review provides the Utility with an opportunity to identify locations where the proposed highway construction is likely to require the relocation of its facility. The utility company and designer can find alternatives to minimize impacts to the proposed construction, utility facilities, and project schedule. • The Conflict Review Letter may be sent to the Utility at the same time as the verification letter. The utility coordinator will determine if this is a prudent action based on available time, and the status of plan development. The utility coordinator will send a fully-verified set of plans to each utility if there were corrections to the plans during the verification stage. If the verification letter and Conflict Review Letter are sent at the same time, the time allotted under 105 IAC 13 for each letter will run concurrently not sequentially.

  11. Spatial and Regulatory Conflicts • A Spatial conflict is a critical point that has actually been determined to be a place where the utility will occupy the same place as the INDOT or LPA project or prevent its construction. • A Regulatory conflict isnot in compliance with the Utility Accommodation Policy, the 10 state standards, OSHA, industry.

  12. A Critical Point • A critical point is any point in the three dimensional continuum where a utility may be in conflict with either an INDOT project or its construction.

  13. Critical Point in PLAN View • Gas (Possibly) in conflict with storm • From Plan View Gas Storm

  14. At the station of a critical point, check cross section Critical Point in PLAN View • Cross section at Station 100+00 • No conflict if separation is adequate Gas Storm

  15. Locate in Plans • Display in Plan View • Plot to Cross Sections • Make engineering assumptions where data is not available • Display identified tolerances • Adjust plan and cross sections to avoid critical utilities

  16. Identify Critical Points • Review plans and cross sections with utility owners • Identify conflict critical locations • Don’t forget to look up • Consider MOT Phasing

  17. Sometimes – Many Possible Critical Points What Can We Identify?

  18. A Second Tool: For Detailed Analysis • When we have identified a critical point at which utilities are very close, a critical point table is one of the best resources in our tool box. • Things to remember

  19. The Critical Table • A critical table uses a spread sheet to identify and keep track of potential utility conflicts in Space. • Used to note the top and bottom elevations of utilities and highway features.

  20. Critical Table One Example

  21. Review-Revise-Repeat • Update utility information in models • Replot in plans and cross sections • Incorporate change capability into design • Identify potential alternatives • Develop cost-benefit scenarios • Review changes with facility owners • Discuss options/motivations of facility owners

  22. Design Techniques • Relocate/Revise Storm Sewer Configuration • Revise inlet/manhole selection • Incorporate multiple trunklines • Add flexibility into the design • Relocate ditch offset/sideslopes • Strategically layout noisewall posts • Realign/relocate bridge piers/abutments • Utilize shallow depth retaining walls/curbs • Revise signal layout • Revise retaining wall configuration

  23. Conflict Remediation • Design conflict structure • Create a utility cradle • Develop underground bridging slab • Modify subgrade treatment selection • Alter MOT Plan • Hold facilities in-place during construction • Splay duct banks

  24. 1st Street – Utility Relocation

  25. Develop Avoidance Strategy

  26. Construction Involvement • Attend Pre-Construction Conference • Discuss results of design Utility Coordination • Review sensitive locations • Address Special Provisions and Plan Notes • Attend Progress Meetings as appropriate • Be available

  27. Reference Links • Design Memo 16-04 Designer Summary of Required Utility Relocation – Project Design and Utility Summary • DM 16-04 • Project Design and Summary Table • Project_Design_and_Utility_Summary_Table.xls • Designing and Constructing Around Utilities • Designing and Constructing Around Utilities

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