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PUBLIC MEETING December 18, 2013
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Hudson Bayou Crossing Tools:
• Advanced Geotechnical Techniques
• Soil Borings/Tests
• Water Level Monitoring
• Geophysical Surveys
• Seismic Surveys
• Sound Engineering Practices
Benefits:
• Constructible Design
• Environmental Protection
• Maintain Integrity of Bridge
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Pomelo Avenue / Pomelo Place
Options: • Open Cut
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Pomelo Avenue / Pomelo Place
AECOM Design • Open Cut
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Pomelo Avenue / Pomelo Place
McKim & Creed Design
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Pomelo Avenue / Pomelo Place
McKim & Creed Design
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Pomelo Avenue / Pomelo Place
Design Benefits: • Upsize Water Mains – Fire Flow
Protection
• New Reclaimed Water Mains
• Full Road Resurfacing
• Restoration of LS 7 Site
McKim & Creed Design
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Alta Vista Street / Osprey Avenue
Options: • Open Cut • Microtunneling
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Alta Vista Street / Osprey Avenue
AECOM Design • Open Cut • Microtunnel
Design Concerns: • Limitations of 24 inch MT
Machine
• Full Length Lubrication
• Intermediate Jacking Stations
• Pipe Material (VC Pipe)
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Alta Vista Street / Osprey Avenue
Design Benefits: • One-pass Construction
• Replace Water Mains (DI and AC)
• New Reclaimed Water Mains
• Storm Sewer Replacement
• Full Road Resurfacing
McKim & Creed Design
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Hudson Bayou Crossing
Options: • Microtunneling • Inverted Siphon
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Hudson Bayou Crossing
AECOM Design • Microtunnel
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Hudson Bayou Crossing
McKim & Creed Design
Design Benefits: • Constructible
• Environmental Protection
• Maintain Structural Integrity of Bridge
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Osprey Avenue
Options: • Microtunneling • Open Cut • Combination
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AECOM Design • Microtunnel
Osprey Avenue
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McKim & Creed Design
Design Benefits: • Minimize Disruption to Luke Wood
Park
• Minimize Traffic Impacts (Osprey and Mound Street)
• Full Street Resurfacing (Mound Street to Bahia Vista)
Osprey Avenue
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Inverted Siphon Option Comparable Planning Level Cost Estimates
24 inch Hudson Bayou 36” (MT HB) 36” (HDD HB)
Open MT Combo MT HDD MT (Alt.) Open MT Combo Open MT Combo
$1.7M $3.2M N/A $0.60M $1.7M N/A $1.5M $1.9M $1.7M $1.2M $1.8M $1.4M
$4.6 Million
Pros:
Minimizes Lift Station Modifications
Cons:
Odor Control
Maintenance Costs
Traffic Impacts
Construction Constraints
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$4.6 Million
Inverted Siphon Option Comparable Planning Level Cost Estimates
24 inch Hudson Bayou 36” (MT HB) 36” (HDD HB)
Open MT Combo MT HDD MT (Alt.) Open MT Combo Open MT Combo
$1.7M $3.2M N/A $0.60M $1.7M N/A $1.5M $1.9M $1.7M $1.2M $1.8M $1.4M
$5.2 Million
Pros:
Minimizes Lift Station Modifications
Cons:
Odor Control
Annual Maintenance
Constructability
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Microtunneling Option Comparable Planning Level Cost Estimates
24 inch Hudson Bayou 36” (MT HB) 36” (HDD HB)
Open MT Combo MT HDD MT (Alt.) Open MT Combo Open MT Combo
$1.7M $3.2M N/A $0.60
M $1.7M N/A $1.5M $1.9M $1.7M $1.2M $1.8M $1.4M
$4.2 Million
Pros: Cost Effective
Traditional Option
Minimizes Impacts to Luke Wood Park
Addresses Public Concerns
Cons: Lower Influent Wet Well
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Microtunnel – What’s Different? • Advanced Geotechnical Investigations
• Soils Borings and Tests (Pipe Alignment) • Bathymetric Survey (Hudson Bayou Depth) • Geophysical Survey (Hudson Bayou Subsurface Mapping) • Seismic Refraction Survey (Hudson Bayou Bridge)
• Adequate Pipe Material • Polymer Concrete
• MT Equipment Selection • Mixed Face Conditions • Specify Lubrication Needs • Intermediate Jacking Stations
• National Microtunneling Specialists
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Lift Station 87 - Design
Underground Vault Cannot Support Traffic Load
Full Pipe Flow (Submerged Flow Conditions)
Odor Control Structure Access
Lower Wetwell Elevation
Access Hatch Covers Leak
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Lift Station 87 - Safety
Limited Communication Between Underground Structures
Access Hatches Do Not Have Adequate Fall Prevention
No Above Ground Indication of Hydrogen Sulfide Gas
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What is Team Doing Differently?
• Advanced Geotechnical Techniques
• Transparent Process
• Pro-Active Public Outreach
• National Design and Construction Expertise
• Fiscally and Environmentally Responsible Approach
• Listening to the Public
Experience + Teamwork = Risk Management
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Schedule
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Questions & Answers
• Protect the City’s Investment
• Protect the Environment
• Improve System Reliability