DHS Consolidation at St. Elizabeths Master Plan Amendment. Transportation Interstate 295 / Malcolm X Avenue Interchange

Transcription

1 Transportation Interstate 295 / Malcolm X Avenue Interchange Consulting Parties Meeting November 08, 2011 (Revised December 20, 2011)

2 Transportation I-295 / Malcolm X Avenue Interchange AGENDA Follow-up to October Consulting Parties meeting Evaluation Process for Hybrid Alternatives DDOT Contributions to Minimization Effort Current Hybrid Alternate 2B. Lane Widths Retaining Wall Heights Exhibits Cross Sections at selected locations Bridge Heights Renderings 2

3 Evaluation Process for Hybrid Alternatives 3

4 Evaluation Process for Hybrid Alternatives Variations of the DEIS alternatives were developed to: Further minimize footprint impacts to the parkland Address operational comments from the community, DDOT and DHS Alternative 2B will be identified as the preferred based on the following: Least amount of parkland impact acres Best addresses traffic movements, efficient access for DHS, JBAB and the community, traffic safety and operations through the corridor DDOT identified 2B as its preferred Early support from FHWA Hdqtrs and Division offices and no design exceptions increases our likelihood for the design getting approved during the IJR process Protects the integrity of the design and the achievements obtained through the 106 process Interchange design process: Preferred Alternative GSA ROD/MOA/NCPC MP Approval FHWA ROD Interchange Justification Report to DDOT IJR to FHWA FHWA Approval Design Development Final Design MOA/NCPC Final Design Approval 4

5 DDOT Contributions to Minimization Effort Construction of ramps to Malcolm X within DDOT ROW allowed for a reduction of parkland impact (quantified in the interchange cross sections identified in slides 18-31) A typical Bridge Design (where the bridge crosses the loop ramp) allowed for removing impact for an order of magnitude of 50' linearly over a distance of a few hundred feet. Lower Design Speed (25 mph design speed when 35 mph is preferred) allowed for minimized loop and smaller footprint 5

6 Hybrid Alternative 2B 6

7 South End South Capitol Street/I-295 7

8 Lane Widths 8

9 Lane Widths 9

10 Retaining Wall Heights Exhibits 10

11 Retaining Walls- Hybrid 2B 11

12 Retaining Walls - Hybrid 2B 12

13 Retaining Walls - Hybrid 2B 13

14 Retaining Walls - Hybrid 2B 14

15 Cross Sections at selected locations 15

16 I-295/Malcolm X Interchange Hybrid Alternative 2B 16

17 Access Rd - Hybrid 2B Profile 17

18 I-295/Malcolm X Interchange- Hybrid 2B Sta Minimized Parkland impacts approximately 23 feet by shifting toward I

19 I-295/Malcolm X Interchange- Hybrid 2B Sta Minimized Parkland impacts approximately 23 feet by shifting toward I

20 I-295/Malcolm X Interchange- Hybrid 2B Sta Minimized Parkland impacts 60 feet by shifting toward I-295 and moving Access Road over loop ramps 20

21 I-295/Malcolm X Interchange- Hybrid 2B Sta Minimized Parkland impacts 65 feet by shifting toward I-295 and moving Access Road over loop ramps 21

22 I-295/Malcolm X Interchange- Hybrid 2B Sta Minimized Parkland impacts 13.5 feet by shifting toward I-295 (partially into interstate ROW) 22

23 Shepherd Parkway south of Gate 4 Area Hybrid Alternative 2B 23

24 Shepherd Pkwy South of Gate 4 Area-Hybrid 2B Sta Minimized Parkland impacts 12 feet by shifting toward I

25 Shepherd Pkwy South of Gate 4 Area-Hybrid 2B Sta Minimized Parkland impacts 5 feet by shifting toward I

26 Shepherd Pkwy South of Gate 4 Area-Hybrid 2B Sta Minimized Parkland impacts 1.5 feet by shifting toward I

27 I-295/MLK/SCS (south end) Interchange Hybrid Alternative 2B 27

28 I-295/MLK/SCS (south end) Interchange-Hybrid 2B Sta Minimized Parkland impacts 13 feet by shifting toward I-295 (Partially into Interstate ROW) 28

29 I-295/MLK/SCS (south end) Interchange-Hybrid 2B Sta Minimized Parkland impacts 10 feet by shifting toward I-295 (Partially into Interstate ROW) 29

30 I-295/MLK/SCS (south end) Interchange-Hybrid 2B Sta Minimized Parkland impacts 77 feet by shifting toward I-295 (Partially into Interstate ROW) 30

31 I-295/MLK/SCS (south end) Interchange-Hybrid 2B Sta Minimized Parkland impacts 36 feet by shifting toward I-295 and South Capitol Street (Partially into existing ROW) 31

32 Bridge Heights Exhibit 32

33 Bridge Heights - Hybrid 2B 33

34 Questions & Answers 34