The Hiawatha Project Challenges of Urban Construction

Transcription

1 The Hiawatha Project Challenges of Urban Construction Joe Samuel PE, PMP, LEED AP Nathan Steward PE

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3 Overview Project Components Project Schedule Stakeholder Engagement Project Challenges A. Urban Substation Design B. Undergrounding Transmission Construction Lessons Learned 3

4 Who is Xcel Energy? 1900 s Company Roots Rural Minnesota Utility Company 19 employees 2.7 miles of transmission line Serving over 700 customers th Largest Transmission Co. (US) Over 12,000 Employees Over 18,000 miles of transmission line Serving over 3 million customers 4

5 Project Components Project Budget - $55M 1) Underground Transmission/Distribution $26M miles Transmission (115kV) - 2 miles Distribution (13.8kV) 2) Hiawatha Substation - $14M 3) Midtown Substation - $15M 6 5

6 Project Schedule Spring 2009 Route Permit Application (RPA) Filed Spring 2010 Certificate of Need (CON) Filed January 2012 MPUC Issues Project Permit October 2012 Construction Commences February-October 2012 Public Outreach & Design June 2014 Hiawatha West Substation Energized December 2014 Midtown Substation Energized 6

7 Substation Perspective Permit Application Hiawatha West Hwy 55 Midtown Portland Avenue 7

8 Stakeholder Engagement Xcel Energy Regulatory Officials Elected Officials General Public stakeholder_dynamics.wmv 8

9 Aesthetic Design Process Purpose 1) Ensure Substation final designs reflect community vision, values and ideas about aesthetics. 2) Designs are compliant with Route Permit and Certificate of Need orders established by MN PUC. AWG Evaluates & Confirms Aesthetics Xcel Design Team Validates Aesthetic Design Advisory Work Group (AWG) Objectives 1) Develop process for achieving AWG purpose. 2) Oversee implementation of chosen process. 3) Liaise with community on chosen process. 4) Ensure final substation design options balance community perspectives about aesthetics with design considerations and process parameters. Technical & Financial Evaluation Initial Evaluation & Ranking of Community Aesthetics AWG Input 9

10 Stakeholder Engagement 10

11 Urban Substation Design 611

12 Hiawatha Substation Site Map Challenges Contaminated Soil Fiber /Rail Relocation Landlocked property LRT Vehicle Theft/Vandalism Multi-discipline Team 12

13 Hiawatha West Perspective Overhead T-Line Regional Trail Highway 55 Commuter Rail Underground Duct 28 th Street Initial: (7) Feeders kV, (1) 70MVA transformer Future: (3) total 70MVA units (15) possible feeders 13

14 Hiawatha West Substation 14

15 Hiawatha West Substation Rendering day rendering: view from the south actual view from the south Actual 15

16 Midtown Substation Site Map Challenges Residential Land Use SHPO Protected Slope Land Acquisition Soil Conditions Residential Land Use Multi-discipline Team SHPO SLOPE Regional Trail 16

17 Midtown Perspective Initial: kV, (1) 70MVA transformer (7) Feeders Future: (2) total 70MVA units (14) possible feeders 17

18 Midtown Substation 18

19 Midtown Substation Rendering Actual 19

20 Project Challenges Midtown Hiawatha West 20 20

21 Underground Construction Vault Manhole Size: 11 W x 25 L x 10 H Cable Diameter: ~5 Cable Weight: 13.3 lbs/ft Cable Installed after Duct Installation 21

22 Underground Construction (cont) Existing Utility Relocation Gas $400,000 Fiber/Telecom $300,000 Watermain $800,000 Sanitary & Storm $100,000 22

23 How Did the Duct Cross the Road? Major Arterial into Downtown Minneapolis 40,000 vehicles/day MN DOT No Impacts to Traveling Public Jack & Bore Crossing vs Open Cut Excavation Superfund Site Hiawatha Substation Highway 55 Crossing 10 day Closure Video Clip Highway 55 HiawathaProjectHwy55.wmv Future Street Car Location 23

24 Lessons Learned Early Project Risk Assessment Progressive Elaboration Education/Outreach Multi-Discipline Interaction Innovation & Constructability Engaged Stakeholders = Success 24

25 Thank You! Joe Samuel, PE, PMP, LEED AP Nathan Steward, PE 24