dallas cbd second light rail alignment (d2) · 2017-02-24 · dallas cbd second light rail...
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![Page 1: Dallas CBD Second Light Rail Alignment (D2) · 2017-02-24 · Dallas CBD Second Light Rail Alignment (D2) Subway Project Refinement Technical Committee Meeting February 23, 2017](https://reader033.vdocument.in/reader033/viewer/2022050412/5f895b11eceb666ae5157f28/html5/thumbnails/1.jpg)
Dallas CBD Second Light Rail Alignment (D2)
Subway Project Refinement
Technical Committee MeetingFebruary 23, 2017
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Meeting Objectives
• Agree on Proposed Refinements and Options to be advanced with alternatives:– West Junction – should RR ROW be advanced?– East Junction – which, if any, Monument Street options
should advance?– Arts District options – is there a viable option to
advance?– Commerce realignment with Swiss only?
• Agree on the set of alternatives – Alignment, Station Locations– Could achieve Short List of 3 options today
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Objectives to Identify Reasonable Set of Subway Alternatives
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Objectives Source
Within $1.3 Billion Budget (YOE) DART
Constructability/Favorable geology conditions DART
Subway between Woodall Rodgers and IH 345 City Council
Ability to shift Green/Orange Line operations to D2 FTA (Core Capacity)
Ease of transfers (Proximity to Existing Bus/Rail) City Council/DART
Access to Jobs (Employment density) City Council/DART
Interoperability between both downtown LRT lines DART
Minimize curves (travel time, O&M, construction) DART
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Reminders
1. Conceptual design only at this time:– Are alternatives feasible? – What is the list of potential impacts to be addressed
further in DEIS? – What are key opportunities? i.e., station locations and
access points, TOD opportunities, operational flexibility
2. Once a refined LPA is selected:– Preliminary engineering for alignment, tunnel portals,
stations and access points– DEIS, mitigation for identified impacts (property,
parks, historic, traffic, etc.)
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Reasonable Alternatives Assessment
Summary of Technical and Stakeholder Committee
Recommendations
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Summary of Options & Refinements
Arts District Options
Ross/Leonard/2-Portal
Olive/Monument
Olive/Pearl/Monument
Olive/Pearl/Swiss
Olive/Modified Swiss
6
Commerce Refinements
Commerce/Swiss (Original)
Commerce/Swiss (Modified)
Commerce/ Good Latimer/Monument 2-portal concept
Monument Street Options
#1
#2
#3
#4
#5
#5 with 2-Portal
#6
RR ROW Options
Pacific - Original
Pacific with 700’ curve
Elm - Original
Elm Refinement
Elm with 700’ curve
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LPA Refinement Evaluation Process
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Key Objectives
Detailed Evaluation
Screening Evaluation
Range of Reasonable
Subway Alternatives
Refined D2 LPA Recommendation
Short List of Subway
Alternatives
Dec-Jan Jan-Feb Mar-May May-June
Assessment of Proposed
Refinements and Options
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Recent Meeting Participants
• Deep Ellum Foundation• City of Dallas Staff• Preservation Dallas• Sixth Floor Museum (letter received)• Dallas County• Victory Stakeholders• Perot Museum of Nature and Science• Bullington Truck Terminal (Thanksgiving
Foundation)• FTA
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Information to support Assessment of Options and Refinements
• Historic resource issues
• Geologic conditions from boring data
– Depth to Austin Chalk
– Thickness of Austin Chalk
• Building plans
• Operating plan
• Demographics/Market Area Coverage
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Historic Resources – RR ROW
• Sixth Floor Museum letter states opposition and concern to Elm or Pacific options that use RR ROW
• Landmark Commission, City of Dallas Historic Preservation and Preservation Dallas do not support due to level of risk and potential impacts
• Dallas County does not support due to level of risk and potential impacts
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Historic Resources – RR ROW
• Section 106 of the National Historic Preservation Act (NHPA)– Requires agencies identify and assess the effects of federally assisted undertakings on
historic properties– Requires that the Advisory Council on Historic Preservation (ACHP) have the opportunity
to comment on the project for compliance with Section 106 and Section 4(f)– Seek ways to avoid, minimize, or mitigate any adverse effects on historic properties
• Section 110 of NHPA – If a project may affect a National Historic Landmark, such as Dealey Plaza, FTA must
consult with the National Park Service
• Section 4(f) of the U.S. Department of Transportation Act of 1966– Transportation projects may not be approved by the Secretary of Transportation unless a
determination is made that there is no feasible and prudent alternative, and that all possible planning has been done to minimize harm
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Geology/Constructability – RR ROW
• RR ROW has poor conditions for tunneling• Cut and cover is not acceptable in Dealey
Plaza• Soft ground TBM machine would be required
for entire project and would increase curve radius requirements in Dealey Plaza area– 700’ radius desirable– Potential to affect larger area– TBM adds concrete liner as it builds tunnel –
this has to be demolished at stations, access points, shafts along the rest of the corridor
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Depth to Austin Chalk
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Thickness of Austin Chalk
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Geology/Constructability – Pacific
• BullingtonTruck Terminal plans
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Operating Plan Concept
• Green
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Existing DART Rail Operations
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Operating Plan Concept
• Green
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DART Rail Operations with D2Works with Victory or RR ROW Option
Orange Line Options (3):- Terminate near East TC and
turnback to DFW- Continue existing service pattern
to Parker Road Station- Add service to Baylor
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DART Rail Operations with D2During Incident Management using Victory Junction
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DART Rail Operations with D2During Incident Management using Victory Pocket Track
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DART Rail Operations with D2During Incident Management using Victory Junction
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DART Rail Operations with D2During Incident Management using Victory Pocket Track
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Market Area Coverage
• Maps and data illustrate current and future population and employment within ¼ mile walk radius of LRT Stations
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Existing Market Area Coverage (¼-mile) and Employment Density
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Existing Market Area Coverage (¼-mile) and Population Density
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Existing Market Area Coverage (¼-mile)
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Existing plus Pacific with Victory-Swiss Combined Market Area Coverage (¼-mile)
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Existing plus Pacific with RR ROW-SwissCombined Market Area Coverage (¼-mile)
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Existing plus Elm with Victory-SwissCombined Market Area Coverage (¼ mile)
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Existing plus Elm with RR ROW-Swiss Combined Market Area Coverage (¼-mile)
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Existing plus Elm with RR ROW-Monument 2 portal Combined Market Area Coverage (¼-mile)
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Existing plus Commerce with Victory-SwissCombined Market Area Coverage (¼-mile)
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Options and Refinements
• West– Victory ROW
– Railroad ROW
• Commerce and Arts District– Arts District/Ross alignment options
– Commerce refinements
• East– Swiss Avenue
– Monument Street
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West Options - Victory ROW
• Victory ROW Option
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West Options – RR ROW
• Elm Railroad RR ROW
– Original
– 700’ Radius Curve
• Elm RR ROW
– Proposed Refinement
• Pacific RR ROW
– Original
– 700’ Radius Curve
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Commerce Options and Refinements
• Study two options:– Straighten curve to Swiss and move portal to east of IH-345
– Feasibility of below grade option via Good Latimer
Straighten curvesOnly advance if below grade option is feasible
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Commerce Refinements
• Straighten curve to Swiss • Below grade option via Good Latimer (2-Portal solution)
Commerce via Swiss Commerce via Good Latimer
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Arts District Options
• Several options developed to determine feasibility
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Arts District Options
• with Station
Leonard to Monument (2-portal)
Olive/Pearl/ Monument (no wye junction)
Olive/ Monument (no wye junction)
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Arts District Options
• without Station
• Olive to Swiss• Olive, Pearl to Swiss
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East Options and Refinements
• Elm Alternative Monument St options
1 2
3
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East Options and Refinements
• Elm Alternative Monument St options
4
6
5
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Initial DART Technical Staff Assessment
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Pacific Elm
West Options West Options East Options
Objectives RR
Ori
gin
al
RR
70
0’
Vic
tory
RR
Ori
gin
al
RR
R
efin
emen
t
RR
70
0’
Vic
tory
Swis
s
Mo
nu
men
t1
Mo
nu
men
t 2
Mo
nu
men
t 3
Mo
nu
men
t 4
Mo
nu
men
t 5
Mo
nu
men
t 5
2
-po
rtal
Mo
nu
men
t 6
Within $1.3 Billion Budget (YOE)
y y y y y y y y y y y y n n y
Constructability/Favorable geology conditions
n y f n f y y y n n y y n f n
Subway between Woodall Rodgers and IH 345
y y y y y y y y y y y y y n n
Ability to shift Green/ Orange operations to D2
y y y y y y y y y y y y y y y
Ease of transfers (Prox. to Existing Bus/Rail)
y y y y y y y y y y y y y n n
Access to Jobs (Employment density)
y y y y y y y y y y n n n y y
Interoperability between both downtown LRT lines
n y n y n y y y y y y y y f n
Minimize curves (traveltime, O&M, construction)
y y y y y y y n y n n n y y n
Advance to Screening? N N Y N N N Y Y N N N N N N N
Meets Objective
Meets Objective with some challenges
Does not meet objective due to fatal flaw or significant risk factor
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Initial DART Technical Staff AssessmentCommerce Arts District (Ross)
Objectives Swis
s
Go
od
Lat
imer
2
-po
rtal
Ro
ss/L
eon
ard
2
-po
rtal
Oliv
e/P
earl
/ Sw
iss
Oliv
e/P
earl
/ M
on
um
ent
Oliv
e/
Mo
nu
men
t
Oliv
e/
Mo
dif
ied
Sw
iss
Within $1.3 Billion Budget (YOE)
y y y y y y
Constructability/Favorable geology conditions
n y f n f y
Subway between Woodall Rodgers and IH 345
y y y y y y
Ability to shift Green/ Orange operations to D2
y y y y y y
Ease of transfers (Prox. to Existing Bus/Rail)
y y y y y y
Access to Jobs (Employment density)
y y y y y y
Interoperability between both downtown LRT lines
n y n y n y
Minimize curves (traveltime, O&M, construction)
y y y y y y
Advance to Screening? Y N N N N N N
Meets Objective
Meets Objective with some challenges
Does not meet objective due to fatal flaw or significant risk factor
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Next Steps
• Complete Screening Evaluation if more than 3 alternatives advance today
• Review Technical Committee recommendations with Stakeholder Committee on March 22
• Initiate more detailed evaluation of short list:– Refine station locations
– Identify station portal opportunities
– Streetcar alignments and connections
– Urban design opportunities
– Real estate needs
– Utility coordination
– Capital costs
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