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 [email protected] 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 [email protected] 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