“pushing the limits of constructability pushes the limits of ......relations firm and a duke over...
TRANSCRIPT
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“Pushing the Limits of Constructability Pushes the Limits of Project Planning”
Case Study: Myrtle-Morehead SDIPCity of Charlotte, North Carolina
Presented By:Chip Smith, PE – Woolpert
Kate Labadorf, PE – City of Charlotte Storm Water Services
Southeast Stormwater Association 2015 Annual Conference
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Presentation Outline
• Overview of Charlotte’s Flood Control Program• Myrtle-Morehead Project History• Phase 1 Constructability Issues Realized• Phase 2 Constructability Issues Under Design• Lessons Learned• Questions and Answers
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City Flood Control Projects
• Drainage system improvements for watersheds up to one square mile
• Typical planning, design and construction duration – 5 to 7 years
• Typical costs range from $500,000 - $10 million
• Annual Funding of $17.3 million
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Problems:• Roadway flooding• Structural flooding• Stream erosion• Deteriorating infrastructure
4
High Water Marks
11024 Blue Heron Drive
Flood Control Project Types
Kingfisher Drive
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Problems: • Road Flooding - 6 Roads• Structure Flooding - 20
structures• Deteriorating Infrastructure
Myrtle/Morehead Project
Parking deck flooding
Metal pipe with holes in bottom
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Project History/Existing System Problems
• Project initiated in 2000 due to chronic flooding of Myrtle Square Apartments, Euclid Avenue, Myrtle Avenue, and Lexington Avenue
• Dilworth area was developed around a creek that was piped with various undersized culverts
• Existing culvert is located underneath and behind numerous houses and apartments
• Dilworth area is a designated Historic Area with homes exceeding $1M in value
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Project Study Area
Project Area
Myrtle Square Condos
Dilworth Historic Area
Drainage Area Outfall
Arlington CondosFlooded Parking Deck
Low Areas
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Project Study Area – Urban & Residential
McDowell Avenue Oriole Avenue
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Project Study Area - Residential
Myrtle Avenue
Lexington Avenue
• Narrow Tree Lined Streets
• OH Utilities• On-Street Parking
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Project Study Area - Residential
Myrtle Square Condominiums
Low Area
Existing Culvert in Courtyard
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Project Study Area - Residential
Euclid Avenue “Sump”
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Alternatives Considered
• Rehabilitation of Existing System– Results in Less than 2 Year LOS
• Upstream Detention for 10 Year LOS– Required 37 Ac-Ft of Storage
• Numerous Alignments for New Culvert• Other Potential Solutions
– Linear Storage– Storm Water Pump Station
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Alternatives Considered
Charlotte Housing Authority
Alternative AlignmentsCharlotte Housing
Authority
37 Ac-FtPond
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Alternative Chosen
Charlotte Housing Authority
Final Alignment
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Project Design & Constructability Challenges
• Routing a 78” to 90” by-pass culvert through the Dilworth neighborhood streets at depths between 20 and 30 feet
• Tunneling under Morehead Street and replacing 80’ of the 54” water main (NCDOT Encroachment)
• Installing 90” culvert by open cut in McDowell Street (NCDOT Encroachment)
• Installing box culvert by squeezing it between a Public Relations firm and a Duke Over Head Transmission Line
Results in a monumental challenge of project planning & stakeholder involvement !
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Impact of Constructability Challenges on Construction Costs
• Only 2 Bidders: $12.15M & $13.04M
• 150 LF of Tunnel 30 feet deep : $3.15M
• Sheeting and Shoring for Deep Open Cut: $600K
• Contaminated Soils and Groundwater: $520K
• 80 LF 54-inch Water Main Replacement: $300K
• Slow construction – 18 months for 1,400 LF : $7.58M
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Phase 1 – Under Construction
Wray WardWray Ward
Wray WardWray WardWray Ward
Wray Ward
Dialysis Center
Duke Endowment HQ
Arts BBQ
Townhouses
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Stakeholders• Property Owner and
Businesses• Charlotte Water – 54-
inch WM Replacement and sewer relocation
• CDOT - Multiphase Traffic Control Plans
• Department of Water Quality
• Duke Energy – OH & Duct Banks
• AT&T – Duct Bank Crossing
• Piedmont Natural Gas –Existing & Abandoned Gas Mains
• NCDOT – Encroachment Permit & Design Approval
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Wray Ward
Existing 9’x6’ RCBC
New 10’x6’ RCBC Adjacent to Existing 9’x6’ RCBC
Existing 9’x6’ RCBC removed to install 2-9’x6’ RCBCs
Existing 9’x6’ RCBC
Duke Energy OH Transmission Line
Duke & AT&T Duct Banks
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New 10’x6’ RCBC Connection @ Sta. 0+00
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Duke Energy OH Transmission Line Tower
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Required Nighttime/Weekend Work
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Wray Ward
Existing 9’x6’ RCBC
New 10’x6’ RCBC Adjacent to Existing 9’x6’ RCBC
Existing 9’x6’ RCBC removed to install 2-9’x6’ RCBCs
Existing 9’x6’ RCBC
Duke Energy OH Transmission Line
Duke & AT&T Duct Banks
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Duke Energy Duct Bank Crossing
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McDowell Street Junction Box
New Culvert C/L
New 12 FT x 12 FT Junction Box
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12’ x 12’ Junction Box
9’x6’ Downstream
90” Upstream
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McDowell Street
New Culvert C/L
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Oh No ! Another Utility Coordination
New Fiber Optic Line
New Culvert C/L
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McDowell Street – Parking Garage Entrance
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McDowell Street – Parking Garage Entrance - October 2015
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Tunneling & Water Main Replacement
No Blasting within 10 feet of Water MainTunneling Stopped for W.M Replacement
WM Replacement Between Dec. and March
NCDOT Encroachment
Tunnel Location
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12’ SEM Tunnel
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54-Inch Water Main Replacement
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54-Inch Water Main Replacement
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Duke Endowment, Arts BBQ, H&R Block
Arts BBQ
Duke Endowment HQ & Parking Garage
Tunnel Shaft ~ 33 Feet Deep
Only Access
H&R Block
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Duke Endowment; Arts BBQ; & H&R Block
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Duke Endowment; Arts BBQ; & H&R Block
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Oriole Avenue Townhouses
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Phase 2 – Final Design
Myrtle Square Apts
New Apts
CHA Redevelopment
90-Inch Pipe ~ 30 Feet Deep
78-Inch Pipe ~ 25 Feet Deep
InterconnectionsMain Driveway
Location Based on Preliminary Re-Development Plans
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Phase 2 –Sequence of Construction Prior to 90” & 78” Pipe Installation
1. Relocate Existing Private Utilities to New Location
2. Remove and Replace Existing Sanitary Sewer Mains in conflict with 90” & 78” Pipe
3. Re-instate Sewer Service Laterals to maintain sewer service during construction
4. Install temporary water main to remove existing water main in conflict with 90” & 78” Pipe
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Stakeholders
• Property Owners and Businesses• Duke Energy – Overhead Power Service• Cable TV & Telephone – Overhead Serve• Piedmont Natural Gas – Existing & Abandoned
Gas Mains• Charlotte Water – Water and Sewer Service to
Customers• CDOT - Traffic Control Plans
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Phase 2 –Sequence of Construction For 90” & 78” Pipe Installation
1. Setup 200’ max road closure2. Trim tree branches to prevent damage3. Install “active” shoring for open cut installation4. Install 90” & 78” Pipe, MH’s, and Street Drainage5. Install Temporary Pavement Restoration6. At Completion of City Block – Install New Water
System and Final Pavement Restoration
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Lessons Learned1. Improve Bid Advertising for Phase 2
– Increase Number of Bidders2. Additional Construction Location Restrictions
– Oriole Street Started Earlier Than Expected– Construction Vehicle Parking, Material Deliveries
3. Stakeholder Involvement Increases During Construction– Significant Utility Coordination During Design – “Tip of Iceberg”– Property Owner Coordination - Unrealistic Requests– Day-to –Day Activities – Garbage Collection; Mail Delivery
4. Costs of “Handcuffing” Contractor– Unrealistic weekend closures
All These Lessons Learned Will Be Applied to Phase 2 !We Are Confident There Will Be Others to Overcome !
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Questions ??