Update to the Waterfront Commission May 21, 2019 RiverRenew is a - - PowerPoint PPT Presentation

RiverRenew Update to the Waterfront Commission

May 21, 2019

RiverRenew is a program owned and implemented by Alexandria Renew Enterprises, with support from the City of Alexandria. 1800 Limerick Street | Alexandria, VA 22314

2

• RiverRenew Program Snapshot
• Outfall 001 Diversion Facility as presented in Development

Special Use Permit #2018-0020

• Outfall 001 Construction Sequence Example
• Outfall 001 Conceptual Restoration Plans
• Potential Haul Routes and Rates during Construction

Presentation Outline

RiverRenew Program Snapshot

4

RiverRenew Program Snapshot

May 2019

Major Components: ►Proposed Work in Alexandria

• Tunnel System to capture flows from Outfalls 001-004

►Proposed Work at AlexRenew

• Tunnel Dewatering Pumping Station and Superstructure
• Increase of peak primary pumping capacity
• Lab relocation and administrative building demolition
• Wet Weather Treatment Facility
• Site security and gate access

Estimated Capital Cost at Construction Midpoint:

• $370M - $555M (conceptual level of design)

Schedule:

• Tunnel System: Dec 2020 – July 2025
• Work at AlexRenew: July 2019 – March 2021

More information:

• riverrenew.com

Outfall 002 Outfall 004 (current location)

AlexRenew Old Town Alexandria

Outfall 003 Outfall 001

LEGEND

Shaft & Diversion Chamber Existing Outfall Pumping Station Shaft Diversion Chamber 12’ Diameter Waterfront Tunnel 6’ Diameter Hooffs Run Tunnel Historic District

N

Technically Preferred Alternative for the Tunnel System. Note that the selection of the final alignment will be accomplished through the Environmental Assessment process.

5

Diversion Chambers & Drop Shafts (at existing outfall locations) Hooffs Run Tunnel (open-cut) Waterfront Tunnel Pumping Station

Major Tunnel System Components to be Constructed

6

ACTIVITY 2018 2019 2020 2021

J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D

Environmental Assessment (EA) Draft Development NPS Review Public Comment and Listening Sessions NPS Issues Decision Document Tunnel System DSUP Planning Commission Meeting City Council Hearing, Issue DSUP Tunnel Pumping Station DSUP Planning Commission Meeting City Council Hearing, Issue DSUP Procurement (Fixed Price Design-Build) Request for Qualifications (RFQ) Request for Proposal (RFP) Development Meetings with Design-Build Team Notice to Proceed (NTP) Construction

RiverRenew Tunnel System Permit and Procurement Schedule

Issue RFQ (Jun 2019) NPS Issues EA (June 2019) NPS Issues Decision Document (Jul 2019) Submit Draft EA (Mar 2019) Issue RFP (Feb 2020) Proposals Due (Aug 2020) June 2019 7/9/19 6/25/19 Shortlist (Oct 2019) NTP (Dec 2020) DSUP Development and Coordination with City Regulatory Team

Environmental Assessment DSUP Procurement Current Quarter Milestone Construction

Legend: DSUP: Development Special Use Permit

DSUP Development and Coordination with City Regulatory Team 9/14/19 9/3/19

Subject to NPS Schedule

Outfall 001 Diversion Facility as Presented in DSUP #2018-0020

8

Outfall 001 Existing Conditions

36” Potomac Interceptor Outfall 001 and Regulator Flow to AlexRenew Oronoco Bay Founders Park Oronoco Bay Park Potomac River 84” × 72” Combined Sewer

N

Potomac River

9

Outfall 001 Diversion Facility Alternatives in DSUP #2018-0020

Robinson Terminal North Oronoco Bay Park East

Technically Preferred Alternative. Note that the selection of the final alternative will be accomplished through the Environmental Assessment process. Drop Shaft Outfall 001 Extension Diversion Chamber Waterfront Tunnel N Un Union St Pendle dleton

• n St

Oron

• noc
• co

Bay N N Un Union St Drop

• p

Shaft Outfall fall 001 Exten ension sion Water erfr front nt Tunnel nel Pendle dleton

• n St

Pot

• tomac
• mac River

er Oronoc

• noco Bay

Diver ersion sion Chambe amber Oronoc

• noco

Bay Park Constructio struction Staging ing Area ea Reside sidential tial Buildin lding N Potomac mac River er Constructio struction Staging ing Area ea Existin ting Outfall fall 001 Existin sting Outfall fall 001

Outfall 001 Construction Sequence Example

11

Phase 1: Site Mobilization

3 months

12

Phase 2: Cofferdam Installation

8 months

Sheet pile installation Finished sheet pile wall Work within sheet pile wall Braced sheet pile wall Sheet pile hammer

13

Phase 3: Shaft Construction

10 months

Shaft excavation support installation Shaft excavation

14

Phase 4: Near Surface Structures

9 months

Reinforcing installation Excavation support and flume Concrete formwork and pours Equipment installation (where necessary)

15

Phase 5: Tunnel Boring Machine Removal & Shaft Fit-out

4 months

Shaft internal concrete (lower shaft) TBM removal Shaft internal concrete (upper shaft) Shaft cover and backfill

16

Phase 6: Site Restoration

2 months

Outfall 001 Conceptual Restoration Plans

18

Illustrative Renderings of Outfall 001 Diversion Facility Restoration

Robinson Terminal North Alternative

Rendering, looking west at Robinson Terminal North Illustrative Landscaping Plan Rendering, looking east at Robinson Terminal North Technically Preferred Alternative. Note that the selection of the final alternative will be accomplished through the Environmental Assessment process.

19

Illustrative Landscaping Plan Rendering, looking south from Oronoco Bay

Illustrative Renderings of Outfall 001 Diversion Facility Restoration

Oronoco Bay Park East Alternative

Technically Preferred Alternative. Note that the selection

• f the final alternative will be accomplished through the

Environmental Assessment process.

Potential Haul Routes and Rates during Construction

21

Existing Traffic Volumes near Construction Sites

Existing = 1,400 vehicles/day Existing = 1,300 vehicles/day

N

Existing = 19,000 vehicles/day Outfall 002 Site Outfall 001 Site Outfalls 003/4 Site

Counts collected in January 2019. Reported values are totals between the hours of 7AM-6PM

WRRF Site Existing = 17,000 vehicles/day*

*Annual Average Daily Traffic for Eisenhower Avenue from 2017 VDOT Special Locality Report 100 (Alexandria)

22

Proposed Haul Routes for All Construction Sites

Line Site 1 Truck Every 001 9 mins 002 11 mins 003/4 16 mins WRRF 5 mins Shared 5 mins

PEAK RATE Outfall 002 Site Outfall 001 Site Outfalls 003/4 Site WRRF Site

N

Assumes 7AM-6PM Work Hours

23

Estimated Outfall 001 Trucks per Day during Construction

10 20 30 40 50 60 70 80 90 Estimated Trucks per Day

Total Soil Materials Dirty Soil

RiverRenew Average = 39 trucks/day (3% of existing traffic volume) RiverRenew Peak = 78 trucks/day (6% of existing traffic volume)

24

Estimated Outfall 003/4 and WRRF Trucks per Day during Construction

20 40 60 80 100 120 140 160 180 Estimated Trucks per Day

Total Soil Materials Dirty Soil

RiverRenew Average = 35 trucks/day (0.2% of existing traffic volume) RiverRenew Peak = 166 trucks/day (1% of existing traffic volume)

25

Potential Construction Practices for Soil Containment

Tarping Street Sweeping Wheel Wash Hauling Inspector

26

Comparison of Outfall 001 Diversion Facility Soil Volumes to Other Approved Alexandria Waterfront Projects

Outfall 001 Diversion Facility

20,000 CY excavated soil

Robinson Terminal North

68,000 CY excavated soil + 17,000 CY imported soils = 85,000 CY

Robinson Landing

55,000 CY excavated soil + 15,000 imported soil = 70,000 CY

CY = Cubic Yards

27

Questions?