100115 sr-710 tunnel community meeting rev2.ppt study jan 20th comm…community meeting sr-710...

Community MeetingSR-710 Tunnel Technical Study 1

SRSR--710 Tunnel Technical Study710 Tunnel Technical StudyCommunity Meeting Community Meeting

Wilson Middle SchoolWilson Middle School

January 20, 2010January 20, 2010

Welcome & IntroductionsWelcome & Introductions

• Elected Officials

• Metro Staff

• Caltrans Staff

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• Caltrans Staff

• Technical Team

• Community Outreach Team

Meeting PurposeMeeting Purpose

• Review Purpose of the Study

• Present the Findings and Draft Geotechnical Summary Report

R i f db k th D ft• Receive your feedback on the Draft Geotechnical Summary Report


Why Tunnels?Why Tunnels?

• Reduce impacts to communities and sensitive areas

4

areas

Purpose Purpose of the of the StudyStudy

• Five zones were investigated

• Collected geotechnical, geological, and hydro-geological information for each zoneeach zone

• Respect Route Neutrality

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Study ZonesStudy Zones

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Scope of Tunnel StudyScope of Tunnel Study

• Collected and reviewed existing information

• Completed field exploration• 25 deep core boringsp g

• 17 Seismic reflection lines

• 78 surface wave measurements

• Evaluated collected data

• Prepared draft summary report

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Exploration SummaryExploration SummaryZone No. of

Existing Borings

No. of Borings Completed in Current Study

No. of Seismic

Reflection Lines

No. of Surface Wave Lines

Approximate Length of Zone

(miles)

1 74 7 4 20 5.0 to 5.5

2 61 5 3 12 5.0 to 5.5

3 40 12 6 24 4.5 to 5.0

4 34 1 2 10 6.0 to 7.5

5 77 0 2 12 9.5 to 11.0

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Summary of Data and Faulting Summary of Data and Faulting Zones 1,2, and 3Zones 1,2, and 3

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Summary of Data and Faulting, Summary of Data and Faulting, Zones 4 and 5Zones 4 and 5

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Limits of Potential Limits of Potential Groundwater Contamination Groundwater Contamination

1111Main ContaminantsPCE - PerchloroethyleneTCE - Trichloroethylene 1111

Status of Contaminated Status of Contaminated Groundwater Sites Per EPAGroundwater Sites Per EPA• Zone 1

• Containment in place• Groundwater treatment began in 1998

• Zone 4• Currently evaluating extent of contamination

R d f D i i t b l t d i t f

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• Record of Decision to be completed in next few years• Remedial and containment plans to be developed after

Record of Decision

• Zone 5• Plan for containment is being evaluated, Installation of

containment planned to begin in next few years• Cleaning up of the SUPERFUND site to be determined

later


Subsurface ConditionsSubsurface Conditions

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Zone 1Zone 1

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Zone 1 (to SRZone 1 (to SR--2 at I2 at I--5)5)

• Uniform geologic conditions consisting mainlyof Puente FormationWeak sandstone with thin siltstone interbeds

• Alluvium has potential for highgroundwater inflows

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• Several inactive faults within the Zone

• Potential gassy conditions

• Superfund site located in the northwest portion

• Groundwater is approximately20 to 50 feet below surface


Zone 1Zone 1 AnimationAnimationZone 1 Zone 1 -- AnimationAnimation

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Zone 2Zone 2

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Zone 2 (to SRZone 2 (to SR--2)2)

• Topanga, Puente and Fernando Formations:• Topanga Formation (siltstone, sandstone)

• Puente Formation (sandstone, siltstone, shale)

• Fernando Formation (sandstone, conglomerate)

• Shallow alluvium at northwest end

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• Variable geologic structures

• Several inactive faults within the zone

• Raymond fault crosses near northwest end

• Groundwater locally up to 20 ft below surface


Zone 2 Zone 2 -- AnimationAnimation

1919

Zone 3Zone 3

2020

• Variable geologic conditionsAlluvium

Sedimentary Rock (Fernando, Puente, Topanga Formations)

Igneous and Metamorphic Rock

• Northern portion of the zone in alluvium

• North of Eagle Rock Fault cobbles and boulders may be t d

Zone 3 (to IZone 3 (to I--210)210)

encountered

• Variable geologic structures (faults, folds, etc)

• Raymond Fault considered active and a groundwater barrier

• Several inactive faults

• Variable groundwater depths

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2222

Zone 4Zone 4Zone 4Zone 4

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Zone 4 (to IZone 4 (to I--210)210)• Mostly alluvium with some Fernando and Puente

Formation rock near south endAlluvium may contain cobbles and boulders

Fernando Formation: mudstone

Puente Formation: sandstone, siltstone, and mudstone

• Raymond and Alhambra Wash Faults are considered

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yactive and act as a groundwater barrier

• Potential for high groundwater inflows in alluvium

• Potential for caving soils

• Groundwater levels not uniform across the zone

• Superfund site located in the central portion



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Zone 5Zone 5

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Zone 5 (to IZone 5 (to I--605)605)• Mostly alluvium with some Fernando and Puente

Formation rock near south endAlluvium may contain cobbles and boulders

Fernando Formation: mudstone

Puente Formation: sandstone, siltstone, and mudstone

• Alhambra Wash Fault is considered active

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• Potential for high groundwater inflows in alluvium

• Groundwater levels not uniform across the zone

• Superfund site located in the south central portion

• Perennial Rio Hondo and San Gabriel Rivers and recharge lakes at eastern portion



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Geologic Zone ComparisonGeologic Zone Comparison

Summary of FindingsSummary of FindingsZone Predominant

Geologic Formation(s)

Number of Geologic

Formations

Percent of Zone in each Formation

Number of Reported / Mapped Faults

Number of Active Faults

Crossing Zone

Potential for Gassy

Conditionsa

Percent of Zone Under Superfund

Site

1 PuenteAlluvium

2 80 to 9010 to 20

5 0 H 5 to 10

2 PuenteTopangaFernando

4 70 to 8010 to 155 to 10

7 1(NW

Portal)

H 0

Alluvium 5 to 10

3 TopangaAlluviumPuente

FernandoDiorite

5 30 to 4010 to 2020 to 305 to 1010 to 20

7 3b M 0

4 AlluviumFernando

Puente

3 70 to 8010 to 1510 to 15

5 2 L 5 to 15

5 AlluviumFernando

Puente

3 75 to 8510 to 155 to 10

3 1 L 5 to 30

aH‐High, M‐Moderate, L‐LowbIncludes potentially active faults

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Key Geotechnical Factors for Key Geotechnical Factors for TunnelingTunneling• Type of material (soil or rock)

• Uniformity of geology

• Rock/soil strength

• Stability of the ground

• Groundwater conditions

• Faults, especially active faults

• Potential for gas (methane, hydrogen sulfide)

• Contaminated soil, rock, or groundwater

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Key Geotechnical Factors for Key Geotechnical Factors for TunnelingTunneling• Type of material (soil or rock)

• Uniformity of geology

• Rock/soil strength

• Stability of the ground

• Groundwater conditions

• Faults, especially active faults

• Potential for gas (methane, hydrogen sulfide)

• Contaminated soil, rock, or groundwater

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Ground StabilityGround Stability

• Loss of ground leads to surface settlement

• Groundwater magnifies issues

• Alluvium (soil deposits)

• Extensive in Zones 4 and 5, some in Zone 3, li it d i Z 1 d 2limited in Zones 1 and 2

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Special Pressurized Face Special Pressurized Face Tunneling MachinesTunneling Machines

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Slurry TBMSlurry TBM

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Watertight Segmental LiningWatertight Segmental Lining

• Designed to resist ground loads, hydrostatic pressures

• Gaskets provide watertight seal

• Significant structural capacity

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Arrowhead TunnelsArrowhead Tunnels

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Uniformity of Geologic UnitsUniformity of Geologic UnitsSoil Weak (Soft) Rock Hard Rock

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TBM with Rock/Soil TBM with Rock/Soil CutterheadCutterhead

• Riverside Badlands Tunnel

• Single TBM for 8 mile tunnel8-mile tunnel

• Weak sedimentary rock; hard rock (gneiss); and alluvium

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Active Faults in Zones 2, 3, 4, and 5Active Faults in Zones 2, 3, 4, and 5

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PlanPlan

b 9+00

b 8+00

Oversized Vault SectionOversized Vault Section

STA b 9+ 09 TO STA b 8+ 01

R 9'-5"5'-0

"4'

-0"

R 8'-3"

R4'-0"

CC

CC

C

C

` TUNNEL

4'-0"

# 5 @ 12"

DESIGN LINE

# 4 @ 7 1/2 "

# 5 @ 7 1/2 "

# 5 @ 12"

# 5 @ 7 1/2 "

# 5 @ 12"

#10 @ 7 1/2 "

# 9 @ 7 1/2 "

# 5 @ 12"

# 4 @ 12"

# 4 @ 7 1/2 "

# 4 @ 12"SL

TUNNEL

4'-1 9/16 "

1'-0

" SLSIDE DRIFTS

STA b 9+ 09 TO STA b 8+ 01

R 9'-5"5'-0

"4'

-0"

R 8'-3"

R4'-0"

CC

CC

C

C

` TUNNEL

4'-0"

# 5 @ 12"

DESIGN LINE

# 4 @ 7 1/2 "

# 5 @ 7 1/2 "

# 5 @ 12"

#5 @ 7 1/2 "

#5 @ 12"

# 10 @ 7 1/2 "

# 9 @ 7 1/2 "

#5 @ 12"

# 4 @ 12"

# 4 @ 7 1/2 "

#4 @ 12"SL

TUNNEL

4'-1 9/16 "

1'-0

" SLSIDE DRIFTS

PlanPlanConfiguration after EarthquakeConfiguration after Earthquake

2.6 m2.6 m 2.6 m2.6 m

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Fault Crossing with Segmental Fault Crossing with Segmental TunnelTunnel

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Summary of Tunnel Case Summary of Tunnel Case HistoriesHistories

LA Metro Gold Line Eastside LA Metro Gold Line Eastside Extension TunnelsExtension Tunnels

Madrid Madrid –– “Calle” 30 Highway “Calle” 30 Highway TunnelTunnel

• Tunnel on M-30 highway to relieve inner-city traffic congestion

• Twin bores 3.6 km long

• 3 traffic lanes on top of 2• 3 traffic lanes on top of 2 emergency lanes


Paris Paris –– A86 TunnelA86 Tunnel

• Two tunnels 7.5 and 10 km long

• 6 traffic lanes in each tunnel (3 in (each direction)

Geotechnical FeasibilityGeotechnical Feasibilityof Tunnelingof Tunneling• Feasible in all 5 zones

• Each zone presents unique conditions

• Technology exists to address these conditions

• Has been done successfully inLos Angeles, California, and around the world

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Tunnel Study Tunnel Study -- ScheduleSchedule6/09 12/093/09 9/099/08 1/09

Encroachment Permit

NTP

Drilling

Geophysical Testing

3/10

Final Report and Final TAC and SC Meeting

Community Meetings

Draft Report

Lab Testing

Data Evaluation


Neighborhood & Community OutreachNeighborhood & Community Outreach

• Steering and Technical Advisory Committees • Elected Officials Briefings• Presentations• Community Meetings & Events• Boring Notices, Fact Sheets, FAQs, Newsletter

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• Website • Canvassing • Advertising & Articles in Local Newspapers• Field Office and Outreach• Information Line

Upcoming MeetingsUpcoming Meetings

Wednesday, January 20, 2010Wilson Middle School1221 Monterey Road

Glendale, 912066 p.m. to 8 p.m.

Tuesday, January 26, 2010San Marino Center

1800 Huntington DriveSan Marino, 91108

6 p.m. to 8 p.m.

Tuesday, February 2, 2010Los Angeles Christian Presbyterian Church

2241 N. Eastern AvenueLos Angeles, 90032

6 p.m. to 8 p.m.

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Wednesday, February 10, 2010Jefferson Middle School1372 E. Las Tunas Drive

San Gabriel, 917766 p.m. to 8 p.m.

Wednesday, February 17, 2010Ramona

N. Figueroa StreetLos Angeles, 90031

6 p.m. to 8 p.m.

Wednesday , February 24, 2010El Monte Community Center

3130 N. Tyler AvenueEl Monte, 917316 p.m. to 8 p.m.

Summary Report DVD Summary Report DVD Library LocationsLibrary LocationsAlhambra Civic Center and

LibraryAlhambra, CA

Arroyo Seco Regional Library

Los Angeles, CA

Crowell LibrarySan Marino, CA

Cypress Park LibraryLos Angeles, CA

El Monte Library El Monte, CA

El Sereno Branch LibraryLos Angeles, CA

Glendale Public LibraryGl d l CA

Irwindale Public Library I i d l CA

La Canada Flintridge Library

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Glendale, CA Irwindale, CAy

La Canada Flintridge, CA

Lincoln Heights LibraryLos Angeles, CA

Live Oak Public LibraryArcadia, CA

Monterey ParkBruggemeyer Library

Monterey Park, CA

Norwood Library El Monte, CA

Pasadena Public LibraryPasadena, CA

Rosemead Library Rosemead, CA

San Gabriel Public Library San Gabriel, CA

South Pasadena Public Library

South Pasadena, CA

Temple City Public Library Temple City, CA


Next StepsNext Steps

• Continued Feedback• Draft Report• Public Comments due February 3, 2010 • Study Next Steps

Fi l S R M h 2010• Final Summary Report- March 2010

• Presentation to TAC/SC- March 2010

Send Comments to: SR-710 Technical Tunnel Study Information

Office

3412 N. Eastern Ave.Los Angeles CA 90032Los Angeles, CA 90032

Toll Free: (877) 710-INFOTel. (323) 222-1710Fax: (323) 222-9710

Email: [email protected]

http://www.710tunnelstudy.info

Questions and AnswersQuestions and AnswersQuestions and AnswersQuestions and Answers

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100115 sr-710 tunnel community meeting rev2.ppt study jan 20th comm…community meeting sr-710...

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