Sr 710 tunnel technical study presentation for city of pasadena city council january 26 2009
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SR - 710 Tunnel Technical Study Presentation for City of Pasadena City Council January 26, 2009. Purpose of the study. Consider all practical routes for the extension of Route 710 Gather information on soil and sub-surface conditions Provide for public input and involvement. Why Tunnels?.

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Sr 710 tunnel technical study presentation for city of pasadena city council january 26 2009

SR - 710 Tunnel Technical Study Presentation for City of Pasadena City Council January 26, 2009


Purpose of the study
Purpose of the study

  • Consider all practical routes for the extension of Route 710

  • Gather information on soil and sub-surface conditions

  • Provide for public input and involvement


Why tunnels
Why Tunnels?

  • Reduce impacts to communities and sensitive areas


Objective of the exploration program
Objective of the Exploration Program

  • A total of 5 potential zones will be investigated

  • Collect geotechnical, geological, and hydro-geological information for each zone

  • Information to be used for screening purposes



Key factors influencing tunneling
Key Factors Influencing Tunneling

  • Faulting

    • Fault displacement

    • Rupture zone length

  • Uniformity of geologic material

  • Potential for adverse tunneling conditions

    • Flowing/squeezing soils, boulders

  • Properties of geologic materials

  • Groundwater conditions

  • Hazardous materials


Geotechnical exploration program
Geotechnical Exploration Program

  • Data collection and review

  • Geologic mapping

  • Geophysical surveys

  • Drilling, sampling, and logging

  • Laboratory testing


Boring activities
Boring Activities

33 small diameter borings; six locations in Pasadena

Vertical and Inclined drilling

Each boring will take 7 to 10 days to complete

Work area is about 12 feet by 60 feet

Drilling performed daytime hours

8


Seismic reflection testing
Seismic Reflection Testing

  • 20 seismic reflection surveys; two locations in Pasadena

  • Non-destructive

  • Most Geophysical testing will be performed at night

  • One location per night



3/09

6/09

9/09

2010

Exploration Program Schedule

9/08

2009

NTP

Encroachment Permit

Site Reconnaissance

Geologic Mapping

Drilling by Caltrans

Drilling by CH2M HILL

Lab Testing

Data Evaluation

Summary Report


Recent findings
Recent Findings

Two superfund sites were identified

The sites are located within Zones 4 and 5

Groundwater in this area is known to be contaminated with Volatile Organic Compounds

Depth of groundwater ranges from 50 feet to 150 feet below ground surface

Tunnel is expected to be at about 200 feet below ground surface

12



Planned activities
Planned Activities

Proceed with the borings in Zones 1, 2 and 3.

Postpone borings in Zones 4 and 5, pending additional information related to the Superfund Sites.

Borings to be done by both Caltrans and CH2M HILL

Borings to begin in early January 2009

Each boring is expected to take about 7 to 10 days to complete

14


Summary of Public Outreach Activities

Total visits to Homes/Businesses: 490 # of Stakeholders added to database: 42


Public outreach and notification program
Public Outreach and Notification Program

Field Surveys of Boring Sites

Federal, State and Local Elected Officials Briefings

Public Notices and Fact Sheet

Posting and Distribution of Notices

Public Facilities

Websites

Canvassing

Field Outreach to affected/sensitive users

Information Line

16


Sr 710 community facilitation scope of work
SR-710 Community Facilitation Scope of Work

Coordinate Study Meetings

Conduct Community Awareness Campaign & Report Public Input

Study Information Office and Website

Events & Presentations

Community Workshops

Focus Groups

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For more information
For more information:

SR-710 Technical Tunnel Study Information Office

3412 N. Eastern Ave.Los Angeles, CA 90032Toll Free: (877) 710-INFOTel. (323) 222-1710Fax: (323) 222-9710

http://www.710tunnelstudy.info



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