purple line extension may 2014 presentation

8/12/2019 Purple Line Extension May 2014 presentation

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Purple Line Extension

Section 1 Advisory Group Meeting May 27, 2014


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Tonights Agenda

Project Update and Look-Ahead

Noise and Vibration Update Pre-Construction Surveys

Discussion


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Advisory Group Role and Priorities

Key Role Communicating between Metro and those you represent

Key Interest : Understanding Construct ion

Impacts to you/your organization Traffic, dust, debris, noise Support/visibility/access for businesses during construction

Security around construction sites

Bus access near construction sites

Other Interests

Station and station-area appearance after construction Appropriate treatment of fossils


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Project Update and Look-Ahead


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Section 1 Update:

Activity in the Area

Wilshire Bus Rapid Transit Project(City of LA)

Private Developments(Desmond on Wilshire)


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Project Update: Section 1

Funding

May 21: Awarded federal Full Funding

Grant Agreement (FFGA) for Section 1

$1.25 billion Full Funding GrantAgreement and $856 million TIFIA

loan

Const ruction Cont racting

January 2014: Proposals submitted from finalist Design-Builder

contractor teams Summer 2014: Award of Design-Build Contract

Summer/Fall 2014: Issue Notice to Proceed (NTP)


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Section 1 Update: La Brea Station

Whats Happened So FarMetro Advanced Util it y Relocat ion (AUR) Work

Work Hours: Sunday-Friday, 8PM-6AM

Saturday, 8AM-6PM

Relocating electric and water lines Wilshire between S. Detroit St. and S. Orange Dr.

La Brea between 6th and 8th Streets

2013: Fiber-optic relocation substantially

complete

Typical cross-section of

underground utilities

All Metro/ Cit y of Los Angeles coordinat ion occurr ing per

exist ing Master Cooperat ive Agreement (MCA)


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Section 1 Update: La Brea Station

Whats Next Ongoing: LADWP to complete

water and electrical connections

Ongoing: Business and

residential profiles for advanced

utility relocations

Community will continue to

receive work notices

E-mail Web

Social Media

Fliers


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Section 1 Update: Fairfax Station

Whats Happened So FarExplorat ory Shaft : March 2014: excavation complete

April 2014: monitoring period began

Fossils preserved for Page Museum

Fiber-Opt ic Cable Relocat ion: March 2014: relocations began Work Hours:

Day work: Monday Friday: 9AM - 3:30PMSaturday: 8AM - 6PM

Night work: Sunday Thursday: 8PM - 6AM

Work anticipated to conclude 2nd Quarter 2016

Addit ional AUR Work: Contractor to start soon

Anticipate same work hours as La Brea

Business and residential profiles to be conducted

All Metro/ City of Los Angeles coordinat ionoccurr ing per exist ing Master Cooperat ive

Agreement (MCA)


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Section 1 Update: La Cienega Station

Whats Happened So Far April 1: Beverly Hills City Council

conditionally approved 2 permit requests

for:

Well monitoring Fiber-optic relocation

May 18: Fiber work began on Wilshire

between Gale and San Vicente

Metro and City of Beverly Hills discussing

Memorandum of Agreement for utilityrelocation work


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Section 1 Update: La Cienega Station

Whats Next

Wilshire/La Cienega conceptual entrance

Selection of AUR contractor and

start of utility relocations

AUR business and residential

profiles to be conducted ahead

of utility relocations

Completion of utility relocations

anticipated for 3rd Quarter 2016


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Section 1 Update: Wilshire/Crenshaw Staging Site

Will be used throughout Section 1 utility

relocation and construction

Low-impact back-up alarms used on trucks

August 2013: Staging for Wilshire/La Brea AURbegan

January 2014: 20 sound fence installed around

SW corner

June 2014: Full sound fence to be installed

around entire yard Ongoing:

Noise awareness training

Maintenance inside and outside of yard


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Noise and Vibration Update


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Overview

Station construction review

Construction locations

Construction activity timeline

Construction activities:

Utility relocation

Demolition

Pile installation

Decking

Station excavation

Station construction Tunnel boring

Cross-passage construction

Material hauling and staging

Mitigation Training

Scheduling

Noise control measures

Monitoring Response

Environmental clearance


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Station Construction Review


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Construction Locations

Construction activities are concentrated at:

Station sites:

La Brea

Fairfax

La Cienega Retrieval shaft at Western Ave

Tunnels bored underground in-between

stations will have no surface noise impacts

Some surface work may be needed between

stations at cross-passage locations

Similar disruption to utility work

Design-Builder will determine how to do this

work


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Construction Activity TimelineOptimal Schedule Without Restrictions

(Assumes extended work hours)


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Activity:

Utility Relocation

Approved Work Hours:

8PM to 6AM: Sunday - Friday

8AM to 6PM: Saturdays as-needed (LA)

9AM to 6PM: Sundays as-needed (BH)

Typically occurs at night

Night-time work hours mandated and

approved by the cities of Los Angeles and

Beverly Hills

Noisiest activities include saw-cutting and

jack-hammering

Projected duration:

La Brea: (8 months remaining)

Fairfax: (23 months)

La Cienega: (28 months)


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Activity: Demolition Proposed Work Hours:7AM to 5PM

Work completed during the day; no night

work

17 buildings slated for demolition

Western: 1 buildings

Crenshaw yard: 1 building

La Brea: 4 buildings

Fairfax: 6 buildings

La Cienega: 5 buildings

Noisiest activity is jack-hammering

Projected duration: Sporadically over 22

months (1 month/building)


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Activity:

Pile Installation

Proposed Work Hours:

7AM to 11PM: 7 days a week

No overnight work, when possible

Piles are drilled not driven to reduce

noise

Noisiest activities include saw-cutting andpile-drilling

Projected duration:

Western: 2-3 months

La Brea: 6-8 months

Fairfax: 10-12 months

La Cienega: 6-8 months


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Activity: DeckingProposed Work Hours:

Full weekend closures

8PM Friday - 6AM Monday

Work completed day and night on weekends

Noisiest activities include saw-cutting, jack-

hammering and large cranes during

operation

Materials delivery and hauling occurs at

night

Projected duration:

Western: 2 weekends

La Brea: 10 weekends

Fairfax: 11 weekends La Cienega: 11 weekends


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Activity:

Station Excavation


24 hours/7 days a week

Work primarily occurs underground

beneath concrete decking

Surface activities include:

Deliveries

Soil removal

Material delivery and hauling occurs at

night

Projected duration: La Brea: 10 months

Fairfax: 17 months

La Cienega: 20 months


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Activity:

Station Construction



Station construction will be primarily

completed under the decking

Surface noise may be caused by:

Concrete pumping

Material delivery

Work will be completed during the

day, where possible

Projected duration:

La Brea: 61 months

Fairfax: 46 months

La Cienega: 44 months


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Activity: Tunnel Boring

Tunnel boring underground

Not expected to generate surface noise

Noise may be caused at La Brea site only by:

Soil treatment plant operations Soil handling/hauling

Tunnel ventilation system

Projected duration: 33 months




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Activity:

Cross-Passage Construction Cross-passages are small connectors linking both

tunnels

Up to 24 cross-passage locations would be built

Surface treatment may be required at cross-

passage locations If surface work is needed, noise and traffic

impacts may be caused at isolated locations by

drilling and pumping equipment

Projected duration: 24 months

(1 month/location)

Design-Build contractor to determine if this workwill be needed


7AM to 11PM: 7 days a week


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Activity:

Material Hauling/Staging


9AM to 3:30PM: Monday to Friday

7PM to 6AM: Sunday to Thursday

TBD: Weekends

Work occurs during non-peak traffic

hours

Noisy activities may include lifting

and placing materials, excavating andhauling

Hauling must occur on major streets

at night

Truck staging sites to be identified


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5-Step Noise Control Plan

1. Training

2. Scheduling of Noisy Activities3. Noise Control Measures

4. Monitoring

5. Response


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Noise Control Plan:

1. Training Employees must take noise awareness training

Provided monthly

Emphasizes the importance of noise control

Discusses methods of limiting noise on the construction site:

No yelling

No idling of equipment

Avoid staging equipment in front of residences

Use noise control measures such as noise blankets, quiet equipment,

placing materials instead of dropping, etc.


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Noise Control Plan:

2. Scheduling of Work Schedule noisiest activities during the

day or early evening hours when

possible. Examples:

Saw-cutting Pile-drilling

Jack-hammering

Traffic restrictions may require that

some of this work occurs at night


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Noise Control Plan

3. Noise Control Measures (Contd)

Moveable noise barriers


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Noise barrier fencing at

Crenshaw staging yard

Noise Control Plan:


Noise barrier fencing at

exploratory shaft


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Solar-powered generators and light

stands (not engine powered)Noise control signage

Noise Control Plan



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Slurry backfill (doesnt require vibratory

equipment)

Rubber pads beneath temporary

construction rails, where needed

Noise Control Plan



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3 levels of monitoring:

Metro

Contractor

Environmental consultant Acoustical engineer interprets results,

prepares monthly compliance reports,

provides input/comments

City of Los Angeles: Police Commission

monitors work and fields complaints City of Beverly Hills: Will monitor work

Noise Control Plan

4. Noise Monitoring


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Construction noise at night must be limited to no more than

5dB above the current ambient noise level

Pre-existing ambient noise levels have been determined:

By independent noise consultant and acoustical engineer

At locations monitored along alignment

Throughout a 24-hour period

Noise Control Plan

4. Noise Monitoring Allowable Noise Levels


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Noise Control Plan:

5. Response 24-hour hotline and email

Contact information is provided to the

community via: All project materials

Signs

Website

Social media channels

E-mail

Hotline monitored: Urgent issues receive immediate response,

otherwise call is returned within 24 hours


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Environmental Clearance

Purple Line Extension underwent full environmental

analysis and clearance as mandated by CEQA/NEPA

Chapter 4 of the EIS/EIR evaluates noise impacts The EIS/EIR identifies mitigation measures and commits

Metro to a mitigation monitoring program

Report is available for review at

www.metro.net/purplelineext
http://www.metro.net/purplelineexthttp://www.metro.net/purplelineext


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Conclusion

Type and amount of noise will varyby activity

Noise largely confined to: The three station locations; and ,

Retrieval shaft area

Many activities will occur belowground

When/where possible, activitieswill: Not be scheduled for overnight

hours Occur away from residences

Metro has techniques tominimize noise

Ongoing monitoring willensure compliance with

allowable levels Response plan in place to

swiftly address any issues thatmay arise

Impacts have been evaluatedin the EIS/EIR


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Pre-Construction Survey (PCS)


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Pre-Construction Survey: Overview

Standard practice for Metro construction projects

Documents conditions before construction beginsfor buildings that:

Front Wilshire along tunnel alignment

Are immediately adjacent to construction staging sites

Includes written report and photos

Shared with property owner


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Pre-Construction Survey: Benefits

Copy provided to property owner

No cost to property owner for survey or report

Documents existing interior and exteriorbuilding conditions

Used by all parties in the event of a damageclaim

Information is confidential


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Pre-Construction Survey: Process

Building walk-through includes: First floor interior rooms, offices and/or apartments

Basement and sub-surface parking

Exterior inspection

Inspector takes measurements and pictures

Building owner/representative and tenants maybe present

Furniture, wall hangings, etc. are usually notmoved


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Pre-Construction Survey: Timing

First, properties around station areas and

retrieval shaft

Then, properties along Wilshire betweenstation areas

June 2014: Begin sending letters to property

owners around station areas and retrieval

shaft seeking permission to conduct survey

Late 2014: Surveys begin


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Future Meeting Topic

Tree Removal and Replacement

Trees will need to be removed for the project

Metro will replace trees 2 for 1

Working with Wilshire Median Advisory Group

Will discuss in more detail at next Advisory Group meeting


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Stay in Touch

metro.net/purplelineext

[email protected]

Infoline: 213.922.6934

Twitter.com/purplelineext

Facebook.com/purplelineext
mailto:[email protected]:[email protected]