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Subsurface Utility Engineering (SUE) ACEC Presentation

Subsurface Utility Engineering (SUE) ACEC Presentation. Infrastructure Project Management Administration March 1, 2012. Why should we include it in our design scope of service?. 24” Gas/48” Storm. Junction Chamber 20’ Off. 36” San./Bridge Abutment. Engineering Justification.

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Subsurface Utility Engineering (SUE) ACEC Presentation

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  1. Subsurface Utility Engineering (SUE)ACEC Presentation Infrastructure Project Management Administration March 1, 2012

  2. Why should we include it in our design scope of service? 24” Gas/48” Storm Junction Chamber 20’ Off 36” San./Bridge Abutment

  3. Engineering Justification • Advanced by FHWA as a positive strategy to minimize change orders and reduce costs • Adopted CI/ASCE Standard 38-02 • Readily available technologies, multiple consultants/contractors with training 3

  4. Subsurface Utility Engineering What is SUE? • “A branch of engineering practice that involves managing certain risks associated with utility mapping at appropriate quality levels, utility coordination, utility relocation design and coordination, utility condition assessment, communication of utility data to concerned parties, utility relocation cost estimates, implementation of utility accommodation policies, and utility design.” –FHWA Scope of Services

  5. Benefits of SUE • Cost-Benefit studies have shown: • FHWA: $1 spent saves $4.62 in change order costs • VDOT: $1 spent saves $7.00 • MDSHA: $1 spent saves $8.00 • Keeps projects on schedule – for conflicts identified in advance design can avoid or be relocated by owner early in project 5

  6. Subsurface Utility Engineering Quality Levels (Source: Mid-Atlantic Utility Locating, LLC)

  7. SUE Scope of Services • Append to Design Scope of Services To include in design scopes of all reconstruction projects, determine limits of investigations and the length of utility or the number of locations to be investigated. Timing: • During environmental assessments and/or at preliminary design (30%) plan stage: -QL-D -QL-C •  During final design (30%, 65%, 90% and final) plan stage -QL-B -QL-A -Utility Coordination

  8. SUE Scope of Services (cont.) Field Measurement and Marking - Electronic methods Metallic pipe/conduit location Ground penetrating radar Vacuum extraction Test pits Source: Mid-Atlantic Utility Locating, LLC

  9. SUE Scope of Services (cont.)

  10. SUE: Changes to DDOT Standards • Design Manual Revise the current edition of the Design Manual to include Subsurface Utility Engineering on complex and non-complex (with excavation) projects

  11. SUE: Changes to DDOT Standards (cont.) • Add the following paragraph… “Note; Subsurface utility engineering shall be used to determine the field location of all utilities during the design process. A justification for NOT using subsurface utility engineer shall be submitted by the DDOT project manager to the Chief Engineer. Provision for test pits, however, should be included as part of the original construction contract.”

  12. SUE: Metrics Number of utility conflicts Number of related change orders Number of days of related delay

  13. QUESTIONS & Comments

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