Westside Subway Extension Project Industry Constructability Review

Westside Subway Extension ProjectIndustry Constructability Review

WELCOME

Tim Clark, MTA Contract Administration Manager

Meeting Format

1hour presentation

1hour for questions/comments at end

Metro will only take questions/comments relating to theIndustry Constructability Review

Presentation, video and list of attendees will be availableafterwards on Metro’s website www.metro.net

Meet the Primes event will follow this session

Agenda

Welcome

Purpose of Industry Constructability Review

Industry Constructability Review Process

Purpose of today’s briefing

Introductions

Overview of Project & Section 1 Scope

Questions to the Industry

Discussion

Purpose of Industry Constructability Review

Opportunity for Metro to interact with the Industry on theWestside Subway Extension, including: Provide an overview of the Westside Subway Extension to the Industry

Status update on preliminary design

Solicit feedback from the Industry on topics that have been raised duringthe preliminary design

Focus on constructability and tunneling issues

Industry Constructability ReviewProcess

Provide written comments to Eva Rodriguezrodrigueze@metro.net by October 30, 2012

Between October 30, 2012 and November 30, 2012 Metro willarrange one-on-one meeting with firms to discuss specificcomments.

The industry comment period will end with the issuance of theRequest For Qualifications (RFQ), which is scheduled forDecember 2012.

Comments may be incorporated in the Request For Proposal(RFP) scheduled for March 2013

Purpose of Today’s Briefing

The purpose of today’s briefing is: To begin discussions on Metro’s approach, including identification of

potential risks, alternative means and methods and potential innovativecost saving ideas

It will focus on questions on which Metro would like the ConstructionIndustry to comment. A list of these questions has been given to allattendees and is included in the documents on CD

Following the briefing, Metro will provide informationconcerning a “Meet the Primes” event with interestedsubcontractors

Documents on CD

1. Wilshire/La Brea Station Advanced PE

2. Wilshire/Fairfax Station Advanced PE Submission, Selected Sheets

3. Wilshire/La Cienega Station Advanced PE Submission, Selected Sheets

4. Draft Station Excavation and Tunnel Contract Documents, Section 1, Vol. 1, 2& 3

5. Selected Draft Technical Specifications to Support Station and Tunnel Design

6. Draft Updated Directive Drawings for smoke enclosures (architecturalelements)

7. Systems Specifications and Drawings for Section 1

8. O & M Design Requirements

9. Draft Geotechnical Synopsis Report for Segment 1

10. Exploratory Shaft, Contract C1034 and Addenda

11. Draft Construction Approach Report for Section 1

12. Draft Excavated Material Disposal Study Report

Introductions

Dennis Mori MTA Executive Officer, Project Management Office. In charge of

Westside Extension Project.

Served as MTA Project Director for: Metro Gold Line Eastside Extension, Los Angeles, CA

Metro Red Line Segment 3 North Hollywood Extension, Los Angeles, CA

Ashok Kothari, P.E. PB Project Director. In charge of PB Team.

Served as Program Manager for: East London Line Extension Project, London, UK

BART San Francisco Airport Extension, San Francisco, CA

Introductions

Amanda Elioff, P.E. PB tunneling specialist . In charge of Westside Subway Extension’s

geotechnical investigation and tunnel design

Served as Tunnel Engineer for: Metro Gold Line Eastside Extension, Los Angeles, CA

Metro Red Line Segment 2 & 3 Extension, Los Angeles, CA

Leo Carse, P.E. PB tunnel and station construction specialist. In charge of Westside

Subway Extension’s: Cost and schedule

Value engineering

Constructability

Served as Construction Project Manager for: East London Line Extension Project, London, UK

BART San Francisco Colma Extension, San Francisco, CA

OVERVIEW

Dennis Mori

Video

Project Overview

• 9-mile subway extension fromWilshire/Western Station toWestwood/VA Hospital

• 7 new stations• $5.1 billion capital cost

Section 1 Scope

3.9 mile alignment along Wilshire Boulevard

3 underground (cut and cover) stations: Wilshire/La Brea,Wilshire/Fairfax, Wilshire/La Cienega

Twin bored tunnels from Wilshire/Western to Wilshire/LaCienega

Tail tracks at Wilshire/La Cienega

2 crossovers

Trackwork

Systems

Estimated construction value of $1.3 billion

QUESTIONS TO THE INDUSTRY

Use of BIM

Does Metro’s use of Building Information Modeling (BIM)in producing the Preliminary Engineering design anddrawings offer advantages to the contractor? Howshould the BIM files be included in the Contract as aresource for the Design-Builder’s use?

BIM Design Process

Building Information Modeling (BIM) process used to create standardized3-D station general arrangement modules

Real-time coordination with other disciplines and design conflictresolution done on a day-to-day basis

Model data used as a basis of other design analysis such as emergencyexiting analysis, constructability studies, quantities and EmergencyVentilation analysis

2-D drawings are produced from the 3-D model

BIM – Conflict Resolution

5D – Quantity Takeoff Process Diagram

1. Export 3D components from theBIM 3D model

2. Build a WBS within 5D softwareand import BIM 3D model

3. Perform 3D takeoff

4. Develop a bottoms-up estimateof quantities

5. Organize WBS template to reusein future takeoffs

BIM 3D ModelQuantity Take

OffReport ofQuantities

Station 1

TunnelSegment 1

..

WBS

5D – Quantity Takeoff

Quantities taken directly from 3D model and organized into three WBSbreakdowns (CSI, Module, SCC) to comply with Metro Estimate Standards

Entrance Example

5D – Quantity Takeoff

A view of the complex quantities calculated for the La Brea concourse slab.

Interfaces at Wilshire/Western

At Wilshire/Western work performed by the Contractorcould impact Metro's existing rail operations. Metro isinterested in understanding contractor's approaches tomanaging this interface both during civil construction,testing, commissioning and start up. Do contractorsforesee any significant risks or issues that are worthy ofcomment at this stage?

Systems and Systems Interfaces

The Section 1 Contract scope of work willinterface train control, power, SCADA andcommunications systems with the existingMetro Purple Line at the Wilshire/Western Station

Any modifications of the existing Metrosystems infrastructure east of the existingWilshire/Western Station will beperformed by Metro

The Section 1 contractor will not performany modifications at the Rail OperationsCenter (ROC) facility

QUESTIONS TO THE INDUSTRY

Ashok Kothari

Standardization of Design Elements

Will the proposed use of standardization of designelements such as room and equipment layouts influencethe Design-Builder’s design and construction approach bycreating efficiencies?

Modular Station Composition

AncillaryModule

Circulation Module Crossover Module(Ancillary at Wilshire/Fairfax)

WILSHIRE/LA BREA

WILSHIRE/FAIRFAX

WILSHIRE/LA CIENEGA

450’

Wilshire/Fairfax – Module A-3 & A-2

Station Ancillary Modules (A, A-2 & A-3)

Wilshire/La Brea & Wilshire/La Cienega – Module A

Module A

Module A-2

Module A-3

Standard Circulation Module (B)

Module B: End loaded concourses

450’-0” long , 25’-6” wide center platforms as system standard

Crossover Module (E-10)

Wilshire/La Brea & Wilshire/La Cienega – Module E-10

Modules are combined to form a station

All information contained in the Revit Model

Risk reduction in construction

Clearspan and Arched Roof

Metro's Preliminary Design is based on a clearspan (i.e.no central column) and arched roof for the stations. Thishas reduced the station footprint, reduced the volume ofconcrete required and should enable a faster build time.Do contractors foresee any issues with adopting thisapproach?

SITE PLAN – LA BREA STATION

Benefits of Clearspan Arch Roof Concept

The clearspan arch roof concept offersthe following savings over a traditionalcolumn/flat roof station concept:

Excavation width reduced by 2’-7”

Excavation height reduced by 1’-0”

Excavation length reduced by 21’-4”in combination with equipment layoutefficiencies

Overall 10% reduction in footprint

Construction Schedule

On Eastside Access Project,NY: Arched roof savedconstruction time

Use of 50ft long formworkresulted in a 5 day concretepour cycle

Photo – courtesy of ESA

Specifications

Specifications on TBM, Precast liner, grout,waterproofing (hydrocarbon resistant membrane) andexcavation support system are provided. Cancontractors recommend changes to these sections thatcould significant time and/or cost savings?

QUESTIONS TO THE INDUSTRY

Amanda Elioff

Exploratory Shaft

Metro will construct an Exploratory Shaft (NTP late2012) to study the ground conditions (tar sands and gas)found in the Wilshire/Fairfax Station area. The testingand monitoring program is detailed in the contractdocuments. Would contractors recommend any furthertesting and data that could be collected?

Exploratory Shaft Location

Exploratory Shaft

Exploratory Shaft Location

Fair

fax

Ave

Fair

fax

Ave

S.O

gden

Dr.

S.O

gden

Dr.

LACMALACMAComplexComplex

La Brea Tar PitsLa Brea Tar Pits

PagePageMuseumMuseum

66thth StSt

Wilshire BlvdWilshire Blvd

Wilshire/Fairfax Station

Wilshire/Fairfax Station

Exploratory Shaft Site

Purpose of Exploratory Shaft

Unique ground conditions Tar sands

Seeps of naturally occurring Asphaltum (tar)

Pockets of methane and hydrogen sulfide gas

Fossils

Test and map tar sands

Measure loads in ground support structure

Quantify methane and hydrogen sulfide gases

Observe ventilation requirements

Refine methods for finding & recovering fossils

Develop relationships with Page Museum, LACMA and the community

Opportunity for observation for bidders during RFP process

Exploratory Shaft Features

18’ x 36’ x 75’deep

Braced Excavation

Piles, Wales &Struts

Shotcrete Lagging

Removal ofExisting RaymondPiles

Geotechnical Monitoring & Instrumentation

Instrumentation and testing includes:

Load and deflection measurements

Settlement

Groundwater monitoring

Gas well readings

Gas measurements in shaft

Geologic mapping

Fossil Recovery

In the “paleo” zone, the use of a smooth blade bucket toexcavate in 6” lifts and the use of tree boxes to removeany fossils has been agreed with the Page Museum.Metro could put forward alternative approaches to thePage Museum if proposed by the contractor in a timelymanner. Would contractors propose alternativeapproaches?

Paleontological Monitoring at ExploratoryShaft

Limits of paleo zone shown inGBR (Plate C.1)

Excavate in 6” lifts with smoothblade bucket (specification02200.3.1.H)

Continuous monitoring atexcavation invert in paleo zone

The same requirements isproposed for the Section 1Contract

Fossil Recovery at Exploratory Shaft

Discoveries to be removed inaccordance with Specification Section01170

Large discoveries would requireremoval using a tree boxing specialist

Fossils are to be delivered to PageMuseum

Costs for boxing and removing thediscovery will be by provisional sum

Standby hours for fossil recovery areincluded in payment items

The same approach is proposed for theSection 1 Contract

Geotechnical Information

Metro is in the process of preparing the GeotechnicalBaseline Report (GBR) for the Design Build RFP. TheIndustry Constructability Review documents include aGeotechnical Synopsis Report, which will form the basisfor the GBR. Do contractors recommend additionalgeotechnical information to be included in GBR?

Geotechnical Synopsis Report

Draft geotechnical information summarized

Includes draft profiles for stations and tunnel reaches

Summaries of testing data

Information planned to be baselined includes:

• Geologic Conditions

- Alluvium

- Sedimentary formations

• Asphalt Sands (Tar)

- Location

- Tar content

• Gas Conditions

• Areas of potential contamination

• Groundwater table

• Soil and groundwaterconstituents

• Fossil Layer

• SubsurfaceObstructions/tiebacks

Concentrations of Gas Expectedin Tunnels and Excavations

Wilshire/La Cienega

Wilshire/La Brea

Wilshire/Fairfax

Water/Gas Proofing of UndergroundStructures

The integrity of the water and gas proofing of thestations, tunnels and cross passages is of key importance.Various details are given on the drawings andspecifications provided. Do contractors have commentson these details?

Wilshire/La Brea, Wilshire/La Cienega and Wilshire/Western: Hydrocarbon Resistant (HCR) Compartmentalized Sheet Membrane

Remedial Grout tubes

Shotcrete lagging

Wilshire/Fairfax Station: All of the above above plus

Passive gas ventilation

Stations and Retrieval Shaft

Waterproofing Installation

Water/Gas Proofing SystemCompartmentalized Sheet Membrane

1

23

4 5

6

1. Shoring System2. Cuspated Drainage Board3. HCR Sheet Membrane4. Waterstops5. Remedial Grout Pipe Assemblies6. Concrete Lining

5

Isometric Compartmentalized View

Isometric View on Station

Compartmentalized SheetMembrane, walls andinvert slab. EachCompartment 1,000 sq-ft

HCR Bentonite CompositeSheet Membrane, roof

Water/Gas Proofing System: Ventilated Cavitywith Sheet Membrane

1. Shoring System2. Dimple core drainage composite3. Ventilation Stacks4. Ventilation Soft Landscape5. Ventilation Pipes6. Trench Drain7. Invert Slab with 1% slope underside

1

3

2

4

5

6

6

4

Isometric View Wilshire/Fairfax Station

Cross Section Wilshire/Fairfax Station

6

3

7

Gasket Details

CLJOINT

RADIAL JOINT

TYPICAL END VIEWFOR RADIAL JOINT

CLJOINT

CLJOINT

CLJOINT

Tunnels

Precast concretetunnel liner

TYPICAL TUNNEL SECTION:NO SECONDARY LINER

Space provision forsecondary liner

TYPICAL TUNNEL SECTION:WITH SECONDARY LINER

Secondary linerPrecast concretetunnel liner

Cross Passage Water/Gas Proofing Details

Replace with Graphic

QUESTIONS TO THE INDUSTRY

Leo Carse

Relocation and Support of Utilities

Metro is proceeding with advanced utility relocations toclear the pile lines based on the footprint of theclearspan station concept. This approach will result inutilities suspended over the excavation that will be thecontractors responsibility. Do contractors have anycomments on what is proposed?

Planned Utility Relocations

Pile Corridor:Cleared of utilitiesin advanceClear span/ arch

roof Station Box

Utilities coordinatedthrough pile lines

Suspended Utilities – Previous Contracts

Available Construction Areas

The project is in an urban area where land is at apremium and Metro has established laydown areas asdetailed in the construction approach report and thedrawings. Do contractors have any comments on theadequacy of what is to be made available by Metro?

Laydown areas available to the contractor

Area (Ft2) Area (Acres)

Wilshire / Western

W-0103 22,457 0.52

22,457 0.52

Wilshire / Crenshaw

A2-300 29,621 0.68

A2-301 42,307 0.97

W-0401 7,502 0.17

79,430 1.82

Wilshire/ La Brea (North)

A2-362 55,083 1.26

W-1201 9,977 0.23

W-1204 alley

65,060 1.49

Wilshire / La Brea South

W-1202 13,948 0.32

W-1203 60,644 1.39

W-1205 1,080 0.02

75,672 1.74

Wilshire / Fairfax (South)

W-1701 29,543 0.68

W-1702 11,631 0.27

W-1703 28,683 0.66

W-1704 12,383 0.28

82,240 1.89

Wilshire / Fairfax (North)

W-1801 (Johnies) 2,000 0.05

W-1802 8,185 0.19

W-1804 alley

W-1805 alley

8,185 0.23

Wilshire / La Cienega (West)

W-2301 16,703 0.38

W-2302 5,499 0.13

22,202 0.51

Wilshire / La Cienega (East)

W-2307 18,642 0.43

W-2308 6,149 0.14

W-2309 6,508 0.15

31,299 0.72

Parcel

Tunnel Reaches

Wilshire/La Brea

Wilshire/La Brea

ExcavatedMaterial Stockpileareas

To Irwindale

Wilshire/Fairfax

Wilshire/La Cienega

Wilshire/Western Retrieval Shaft

Haulage of Materials

The proposed haul routes are indicated in theenvironmental documents. Do contractors havecomments regarding the staging of trucks, haul routesand compliance with the requirement for hauling?

Environmental Requirements

The Final Environmental Impact Statement/ EnvironmentalImpact Report (FEIS/FEIR) details: Section 3.6.5: Construction related transportation impacts, including

haulage requirements

Table 3-19 & 3-20: Anticipated haul routes and number of truck trips

Mitigation Measures are detailed in Appendix I of theFEIS/FEIR, in particular: TCON-2: Hauling prohibited between the Hours of 7 to 9 AM and 3:30

to 7 pm on Weekdays

TCON-9: Off-Street Parking for Construction Staff

Disposal of Excavated Materials

Preliminary investigations have identified a potentialclean disposal site in Irwindale, CA and a contaminated,non hazardous material disposal route using rail cars toEast Carbon, UT. Do contractors see other options basedon the quantities and characteristics of the materials?

Power for Construction

Metro is proposing to provide a 15MW supply at the LaBrea site for the Contractor's use. Given expectedrequirements of TBM power, fans, scrubbers and otherequipment, is 15MW sufficient power?

Schedule

A draft outline schedule for the Westside SubwayExtension, Section 1 is given in the ConstructionApproach Report. Are there any comments on meetingthe proposed construction schedule?

Section 1 Schedule

Q-7 Q-6 Q-5 Q-4 Q-3 Q-2 Q-1 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25 Q26 Q27 Q28 Q29 Q30 Q31 Q32 Q33 Q34 Q35 Q36 Q37

RFQ/RFP

Bid

Design

Procure TBM

La Brea Box

Drive Tunnel - La Brea to Western

Wilshire/Western Shaft

Fairfax Box

La Cienega Box

Drive Tunnel - La Brea to La Cienega

Cross Passages, Walkways and Inverts

La Brea Station

Fairfax Station

La Cienega Station

Lay Track - East to West

Systems Installation & Testing

Substantial Completion

Pre-revenue service (Metro)

Division 20 Yard Laydown Area

Does Metro need to provide a separate facility for railwelding? If so, what size would be required?

Potential Area for Rail Welding Yard

Proposed area for railwelding yard, approx650ft long.

E6th

Stre

et

S Santa Fe Ave

LA River

Raised Decking

Metro and LADOT have agreed on the concept of usingraised decking at the Wilshire/Fairfax station to mitigaterisks associated with the utility relocations andexcavation in the paleo zone. Will contractors benefit byusing this approach?

Temporary Street Decking: Weekend Closures

Deck Placement1.Beams delivered to site as singlebeams2.Welded into pairs in staging area3.Erected as pairs during weekendclosure

Deck Beam Pairs

Deck Beams

ReinforcedConcreteCapping Beam

Soldier Piles

Deck Beam Installation

Tunneling Methods

Pressure face TBMs will be specified for this contract. Ifcontractors propose EPB machines, what additionalmethods could be used to control gas within the tunnel?

EPB & Slurry TBM’s

EPB TBM SLURRY TBM

Subsurface Obstructions

Unknown tiebacks and oil wells may be encounteredalong the tunnel drives. What strategies couldcontractors use for dealing with these?

SUMMARY AND DISCUSSION

Dennis Mori

Industry Constructability ReviewProcess Summary

Provide written comments to Eva Rodriguezrodrigueze@metro.net by October 30, 2012

Between October 30, 2012 and November 30, 2012 Metro willarrange one-on-one meeting with firms to discuss specificcomments.

The industry comment period will end with the issuance of theRequest For Qualifications (RFQ), which is scheduled forDecember 2012.

Comments may be incorporated in the Request For Proposal(RFP) scheduled for March 2013

Discussion