public meeting - city of sarasota lift station 87...

PUBLIC MEETING December 18, 2013

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

Pomelo Avenue / Pomelo Place

Options: • Open Cut


AECOM Design • Open Cut


McKim & Creed Design


Design Benefits: • Upsize Water Mains – Fire Flow

Protection

• New Reclaimed Water Mains

• Full Road Resurfacing

• Restoration of LS 7 Site


Alta Vista Street / Osprey Avenue

Options: • Open Cut • Microtunneling


AECOM Design • Open Cut • Microtunnel

Design Concerns: • Limitations of 24 inch MT

Machine

• Full Length Lubrication

• Intermediate Jacking Stations

• Pipe Material (VC Pipe)


Design Benefits: • One-pass Construction

• Replace Water Mains (DI and AC)

• New Reclaimed Water Mains

• Storm Sewer Replacement

• Full Road Resurfacing


Hudson Bayou Crossing

Options: • Microtunneling • Inverted Siphon


AECOM Design • Microtunnel



Design Benefits: • Constructible

• Environmental Protection

• Maintain Structural Integrity of Bridge

Osprey Avenue

Options: • Microtunneling • Open Cut • Combination

AECOM Design • Microtunnel

Osprey Avenue


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

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

$4.6 Million

Inverted Siphon Option Comparable Planning Level Cost Estimates



$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

Microtunneling Option Comparable Planning Level Cost Estimates



$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

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

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

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

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

Schedule

Questions & Answers

• Protect the City’s Investment

• Protect the Environment

• Improve System Reliability

public meeting - city of sarasota lift station 87...

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