Louisiana Transportation Conference

Transcription

1 Presented to: Louisiana Transportation Conference Presented by: R. Mark Pitchford, PSM February 11, 2009

2 Presentation Outline What is Subsurface Utility Engineering? Why Use it? When do we use SUE? What are the Benefits? Results on Projects Discussion

3 Subsurface Utility Engineering C h h From Concept Through Construction

4 What is Subsurface Utility Engineering? Subsurface Utility Engineering (SUE) Combining i geophysics, surveying and civil il engineering, i Subsurface Utility Engineering involves

5 What is Subsurface Utility Engineering? Records Research: Obtaining and reviewing all current and past utility information Designating: Using geophysical prospecting techniques to determine the existence and horizontal position o of underground d utilities t Locating: Using non-destructive excavating equipment to expose the utility to determine precise vertical and horizontal position, type, size, condition, material, and other characteristics of underground utilities

6 What is Subsurface Utility Engineering? Data Management: Collected information during the designating and locating steps is entered into a CADD system or Geographic Information System (GIS) for designers to examine project options to eliminate utility conflicts Utility Coordination: Working with Utility Agencies/Owners through the entire process to come to a satisfactory resolution over utility conflicts

7 What is Subsurface Utility Engineering? American Society of Civil Engineers Defines Subsurface Utility Engineering Four Quality Levels represent different combinations of Subsurface Utility Engineering activities Quality Levels represent the standard Quality Levels represent the standard of care that should be present for all Subsurface Utility Engineering services

8 What is Subsurface Utility Engineering? ASCE Quality Level D Information comes solely from existing utility records, individual recollections, and design tickets

9 What is Subsurface Utility Engineering? ASCE Quality Level C Involves surveying visible aboveground utility facilities, such as manholes, valve boxes, etc. Correlates survey data with existing utility records/plans

10 What is Subsurface Utility Engineering? ASCE Quality Level B Involves the use of surface geophysical techniques Determines the existence and approximate horizontal position of underground utilities

11 What is Subsurface Utility Engineering? Is the Louisiana One-Call Locating the same as ASCE Quality Level B?

12 What is Subsurface Utility Engineering? Answer: NO! WHY NOT? One-Call was not developed in accordance with CI/ASCE Standard Not depicted on plans and signed by a Licensed Professional Engineer Not backed-up by Errors & Omissions Insurance

13 What is Subsurface Utility Engineering? One-Call vs. ASCE Quality Level B ONE-CALL MARK INDICATING GAS LINE ASCE QUALITY LEVEL B MARK INDICATING GAS LINE

14 What is Subsurface Utility Engineering? One-Call vs. ASCE Quality Level B UTILITY LOCATION ACCORDING TO ONE-CALL ACTUAL LOCATION OF UTILITY FOUND WITH DESIGNATION (SURVEYED)

15 What is Subsurface Utility Engineering? One-Call vs. ASCE Quality Level B Unless collected and depicted in accordance with the CI/ASCE Standard, d designers have no assurance that the information is accurate and complete.

16 What is Subsurface Utility Engineering? ASCE Quality Level A Involves the use of nondestructive excavating equipment at critical points Determines the precise horizontal and vertical position, type, size, condition, material, and other characteristics of underground utilities

17 Why Use Subsurface Utility Engineering? g Existing underground utilities abound Power Telecommunications Gas / Propane Petroleum Sanitary Sewer Drainage Steam Sea Water Cable TV Fiber Optic

18 Why Use Subsurface Utility Engineering? g We do not know where most utility facilities are

19 Why Use Subsurface Utility Engineering? g Existing records are often inaccurate/incomplete Risks become extremely difficult to manage Dependable\Reliable\Professional

20 When do we use SUE Services? Louisiana Department of Transportation and Development: Stage 0/Stage 1 = SUE Quality Level D Stage 3 = SUE Quality Levels B and A Stage 5/Stage 6 = SUE Quality Levels B and A

21 What do we do with the Information? During Design / Design Applications Modify project owner s design Introduce design alternatives Identify utility relocations Utility Coordination and Subsurface Utility Engineering work in tandem to create a comprehensive utility plan for each project

22 Benefits of Using Subsurface Utility Engineering g Without accurate utility information Unforseen costs, project delays, workers injuries or even loss of lives can be the result

23 Benefits of Using Subsurface Utility Engineering g Fortunately, there's a way to handle risks! Subsurface Utility Engineering! g

24 Benefits of Using Subsurface Utility Engineering g Total Risk for the Engineering Pool Decreases as Quality Level Increases UNDEFINED QUALITY LEVEL DEFINED QUALITY LEVEL D C B A RISK ELIMINATED Without SUE TOTAL RISK DESIGN ENGINEER With SUE SUE ENGINEER TOTAL ENGINEERING RISK POOL ALLOCATION OF RISK WITHIN ENGINEERING POOL

25 Benefits of Using Subsurface Utility Engineering g Cost Saving FHWA Study $4.62 savings for every $1.00 spent on Subsurface Utility Engineering Biggest savings: Relocations avoided Fewer delay claims

26 Benefits of Using Subsurface Utility Engineering g Cost Saving University of Toronto Study $3.41 savings for every $1.00 spent on Subsurface Utility Engineering Biggest savings: Fewer delay claims Relocations avoided SUBSURFACE UTILITY ENGINEERING IN ONTARIO: CHALLENGES & OPPORTUNITIES Centre for Information Systems in Infrastructure & Construction (I2C) Department of Civil Engineering, University of Toronto October 2005

27 Sometimes.there are harder things to deal with than Utilities on the job!

28 RESULTS! Union Pacific Railroad Overpass on LA 3, Near Benton in Bossier Parish: Replacement of an existing railroad bridge overpass on a new location and provide new approaches Location of Crude Oil Line High Design/Construction Cost for Longer than normal Bridge Span Utilities included d telephone, fiver optic, natural gas and petroleum Underground Utilities - QLB: 14,100 No. of Test holes - QLA: 20 Cost: $59,874 Shorter bridge span, strategically located bridge piles and not having to relocate the crude oil line = significant reduction in project costs.

29 RESULTS! Weeks Island Bridges on LA 83 in Iberia Parish: Rebuild Stumpy Bayou and Warehouse Bayou Bridges & Replace Patout Bayou Bridge December 2005 Underground telephone, power and petroleum lines fiber optic, water, Underground Utilities - QLB: 13,675 lf No. of Test holes - QLA: 22 Costs: $64,706 Approximate Savings: $2 million Savings/Cost: $30.91 / $1

30 RESULTS! OPTIMUM PROJECT DEVELOPMENT: Peachtree Road Corridor - A Case Study Project Length (miles): 0.42 No. of Utility Owners: 10 Underground Utilities (LF): 48,000 No. of Test holes: 61 Costs: $110, Savings: $2,731, Savings/Cost: $24.7 / $1

31 Discussion

32 THANK YOU!

33 TBE Subsurface Utility Engineering Conflict Matrix Station and Offset Utility Comments Action Required , 43' R AT&T AT&T pedestal in area of temporary pavement Pedestal needs to be relocated , 35' R AT&T Proposed drainage age structure S-102 on top of AT&T line Confirmed 28 AT&T conduit at 2.65' deep. Conflict

34 TBE Subsurface Utility Engineering Start with the Topography Add Existing Right-of-Way Add Existing Utilities (QL B)

35 TBE Subsurface Utility Engineering Add Preliminary Roadway Design

36 TBE Subsurface Utility Engineering Add Preliminary Drainage Design

37 TBE Subsurface Utility Engineering Analyze Conflicts Identify Locations Build Conflict Matrix Utility Owner Type Size Station Offset Side Conflict Description Teco Gas LT Off-Site SW Trunk Line Teco Gas LT Main Line Cross Drain Teco Gas ** LT Main Line Cross Drain Teco Gas ** LT Main Line Cross Drain Teco Gas ** LT Main Line Cross Drain Lee Co. Water LT Side Street Cross Drain Teco Gas LT Side Street Cross Drain Teco Gas *** LT Main Line Cross Drain Teco Gas LT Main Line SW Trunk Line Teco Gas LT Main Line SW Trunk Line Teco Gas LT Main Line SW Trunk Line N. Ft. Myers Sewer RT Pond 1A Trunk Line N. Ft. Myers Sewer RT Pond 1A Outfall N. Ft. Myers Sewer ^ LT Main Line Cross Drain B SUR LT L

38 TBE Subsurface Utility Engineering Identify Actual Conflicts Analyze SUE Data Update Conflict Matrix Not A Conflict Utility Owner Type Size Station Offset Side Conflict Description Teco Gas LT Off-Site SW Trunk Line Teco Gas LT Main Line Cross Drain Teco Gas ** LT Main Line Cross Drain Teco Gas ** LT Main Line Cross Drain Teco Gas ** LT Main Line Cross Drain Lee Co. Water LT Side Street Cross Drain Teco Gas LT Side Street Cross Drain Teco Gas *** LT Main Line Cross Drain Teco Gas LT Main Line SW Trunk Line Teco Gas LT Main Line SW Trunk Line Teco Gas LT Main Line SW Trunk Line N. N. Ft. Myers Sewer RT Pond 1A Trunk Line N. N. Ft. Myers Sewer RT Pond 1A Outfall N. N. Ft. Ft. Myers Sewer ^ LT Main Line Cross Drain