Regional Connector Transit Project Public Hearing – June 30 and July 7, 2015

Project Update

1. Open House

2. Presentation on SEIS Purpose and Tunneling Method Alternatives

3. Public Comments

Public Hearing Agenda

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Based on two decades of planning

and environmental review –

Final EIS was prepared for the

Locally Preferred Alternative (LPA)

approved by the Metro Board of

Directors on April 26, 2012

Federal Transit Administration

(FTA) issued a Record of

Decision (ROD) on June 29, 2012

Regional Connector Transit Project

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Per Order of the U.S. District Court issued

May 28, 2014 –

Draft Supplemental Environmental Impact

Statement (DSEIS) prepared to provide

additional detail on tunneling methods

not selected for construction along Flower

Street between 4th Street and the 7th Street/

Metro Center Station, specifically:

- Open-Face Shield

- Sequential Excavation Method (SEM)

Purpose of the SEIS

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Flower Street has major underground constraints that impact tunneling –

“Mesh” of building foundation tie-backs and many utilities

Unstable soils and challenging mixed-face geologic conditions

Perched groundwater and hazardous gases

Flower Street Segment Challenges

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Locally Preferred Alternative (LPA)

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LPA designed to address Flower Street segment challenges

EPBM tunneling north from 4th Street is most viable tunneling method given underground conditions of Flower Street segment

Cut and cover construction –

- Allows for safe removal of tie-backs

- Minimizes risk of ground loss and settlement due to unstable soils and geologic conditions

- Vents hazardous gases

- Minimizes risk of encountering utilities during construction

LPA Construction Elements

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SEIS Project Alternatives

Two tunneling method alternatives were identified to evaluate the use of other tunneling techniques on Flower Street:

Alternative A – a combination of Earth Pressure Balance Tunnel Boring Machine (EPBM), Open-Face Shield, and Sequential Excavation Method (SEM) construction methods

Alternative B – a combination of EPBM and SEM construction methods

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• Ground stabilization required for Open- Face Shield and SEM tunnel methods

• Jet grouting recommended given soil conditions on Flower Street

• Mix of cement grout and soil is injected to form a grid of 6-foot diameter columns extending 40-feet below grade

- Alternative A requires 1,900 jet holes

- Alternative B requires 1,000 jet holes

• Even with grouting, total ground stability is not assured given Flower Street underground conditions

Ground Stabilization

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Tunneling Method Alternative A

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Tunneling Method Alternative B

Construction Schedule Impacts

Comparison of Construction Schedule Impacts

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Construction Duration

Change in Construction

Duration (Over Project)

Required Pre-construction

Activities

Total Project Delivery Duration

Revenue Service Date

Total Project Delivery Delay (Over Project)

Alternative Months Months Months Months Date Months Years

The Project 78 -- -- 78 Mid-2020 -- --

Alternative A 93 15 29 122 Early-2024 44 3.7

Alternative B 85 7 29 114 Mid-2023 36 3.0

Excavation Material Handling

Excavation Activity on Flower Street and in Little Tokyo

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Impact The Project Alternative A Alternative B

Hauling of Excavated Materials from Flower Street

On Flower Street • Percentage of total Flower Street materials • Duration of hauling activities

81%

9 Months

25%

1 Month

20%

1 Month

In Little Tokyo • Percentage of total excavation activities • Duration of hauling activities

19%

2.5 Months

75%

19 Months

80%

17 Months

Excavation/Construction Trucks Per Day

On Flower Street 32 18 8

In Little Tokyo 8 22 32

Duration of Truck Impacts (for hauling excavated materials) 9 Months 19 Months 10 Months longer

17 Months 8 Months Longer

Public Comments

Public comment period through 5pm on July 27, 2015

Complete comment form

- At a Public Hearing

• June 30 at Central Library

• July 7 at JANM

- By Mail: Dolores Roybal Saltarelli, Project Manager

One Gateway Plaza, MS 99-22-2

Los Angeles, CA 90012

• Via web: www.metro.net/regionalconnector

• E-mail: regionalconnector@metro.net

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