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

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• 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

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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.

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Diversion Chambers & Drop Shafts

(at existing outfall locations)Hooffs Run Tunnel (open-cut) Waterfront TunnelPumping Station

Major Tunnel System Components to be Constructed

6

ACTIVITY2018 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

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Outfall 001 Existing Conditions

36” Potomac InterceptorOutfall 001 and Regulator

Flow to AlexRenew

Oronoco Bay

Founders Park

Oronoco Bay Park

Potomac River

84” × 72” Combined Sewer

N

Potomac River

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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 001Extension

Diversion Chamber

Waterfront Tunnel

N U

nio

n S

t

Pendleton St

Oronoco Bay

N

N U

nio

n S

t

Drop Shaft

Outfall 001

Extension

Waterfront Tunnel

Pendleton St

Po

tom

ac R

ive

r

Oronoco Bay

Diversion Chamber

Oronoco Bay Park

Construction Staging Area

Re

sid

en

tia

l B

uild

ing N

Po

tom

ac R

ive

r

Construction Staging Area

Existing Outfall

001

Existing Outfall

001

Outfall 001 Construction Sequence Example

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Phase 1: Site Mobilization3 months

12

Phase 2: Cofferdam Installation8 months

Sheet pile installation

Finished sheet pile wall

Work within sheet pile wall

Braced sheet pile wall

Sheet pile hammer

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Phase 3: Shaft Construction10 months

Shaft excavation support installation

Shaft excavation

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Phase 4: Near Surface Structures9 months

Reinforcing installation

Excavation support and flume Concrete formwork and pours

Equipment installation (where necessary)

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Phase 5: Tunnel Boring Machine Removal & Shaft Fit-out4 months

Shaft internal concrete (lower shaft)

TBM removal Shaft internal concrete (upper shaft)

Shaft cover and backfill

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Phase 6: Site Restoration2 months

Outfall 001 Conceptual Restoration Plans

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Illustrative Renderings of Outfall 001 Diversion Facility RestorationRobinson Terminal North Alternative

Rendering, looking west at Robinson Terminal North

Illustrative Landscaping PlanRendering, 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.

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Illustrative Landscaping Plan

Rendering, looking south from Oronoco Bay

Illustrative Renderings of Outfall 001 Diversion Facility RestorationOronoco Bay Park East Alternative

Technically Preferred Alternative. Note that the selection

of the final alternative will be accomplished through the

Environmental Assessment process.

Potential Haul Routes andRates during Construction

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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)

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Proposed Haul Routes for All Construction Sites

Line Site1 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

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Estimated Outfall 001 Trucks per Day during Construction

0

10

20

30

40

50

60

70

80

90

Esti

ma

ted

Tru

ck

s p

er

Da

y

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)

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

0

20

40

60

80

100

120

140

160

180

Esti

ma

ted

Tru

ck

s p

er

Da

y

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)

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Potential Construction Practices for Soil Containment

Tarping Street SweepingWheel Wash Hauling Inspector

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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

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Questions?