Four Mile RunRestoration ProjectJoint Task Force Meeting

March 10, 2016

Significant Milestones:

� 2000: City, Arlington & NRVC began to explore the stream’s water quality and recreation potentials; USACE partnered with team to conduct a feasibility study on a restoration plan.

� 2001: US Congressman Moran sought allocation through EPA of $1M for development of the Four Mile Run Master Plan.

� 2006: The City and County adopt the Master Plan.

� 2008: STAG grants appropriated for demonstration project & design begins.

� 2009: The City and County adopt the Design Guidelines.

10th Anniversary of the adoption of the Four Mile Run Master Plan

� 2009: The City and County hold a competition for design of a pedestrian/cyclist bridge.

� 2011: Conservatory Building opens and adjacent area renovated; Four Mile Run Park Farmer’s and Artisans Market opens.

� 2012: Buro Happold begins bridge design.

� 2012: Design scope for the demonstration project changes based on new USACE requirements.

� 2015: Construction begins to restore Alexandria’s wetlands.

� 2016: Alexandria wetlands project complete & Arlington shoreline restoration begins.

Wetlands and StreambankProject Overview

3

• Naturalize the banks along the corridor and improve access to the stream through overlooks and terracing

• Replace rip-rap with vegetation and create Living Shorelines on Arlington side

• Establish historical tidal wetland condition in Four Mile Run Park in Alexandria

∗ Wetland restoration∗ Soil grading∗ Invasive plant removal∗ Native plantings∗ New pervious surface trail

Wetland Project

4

Wetland Project

5

Yellow pond-lilyNuphar advena

Arrow arumPeltandra virginica

Annual wildriceZizania aquatica

Low Marsh Plantings

Wetland Project

6

Square stemmed monkey flowerMimulus ringens

Broadleaf arrowheadSagittaria latifolia

SoftstemBulrushSchoenoplectustabernaemontani

Halberd-left rose mallowHibiscus laevis

Southern blue flagIris virginica

High Marsh Plantings

∗ Majority of Construction completed in November 2015

∗ Additional work to be done in spring:− Parking lot renovation− Trail drainage work− Bridge from wetlands to

ball field

Status of Wetlands Project

7

Start of construction in May 2015

8Mid-construction in June 2015

9

Mid-construction in August 2015

Mid-construction in October 2015

10

End of construction in November 2015

Living Shorelines Project

11

∗ Remove rip rap ∗ Create living shoreline∗ Remove invasive plants∗ Replant with natives∗ Add viewing platform∗ Trail improvements

Site 2 Design Section

12

∗ Living shoreline: Arrow Arum, pickerelweed, broadleaf arrowhead, river bulrush, common three-square

Pickerelweed Arrow Arum Three-square

∗ Upland meadow: Eastern smooth beardtongue, common milkweed, bee balm, grass leaved goldenrod, black eyed susan

Site 2 Plantings

13

Bee balm Beardtongue Black eyed susan

∗ Initial bid June, 2015 (only one bid received)∗ Project plans had to be revised for improved site access

and will be re-bid, spring 2016∗ Construction start estimated July-September 2016∗ Bike trial on Arlington side will be closed for construction

(approximately 1 year)∗ Detour on Alexandria trail

Schedule Site 2

14

15

Watermarks

16

�The symbolism of water and the application of the color blue is essential to the Watermark design. �All Watermarks will be cast-in-place concrete integrated with a blue pigment.�23 Watermarks are proposed, 17 in Arlington and 6 in Alexandria�1 Watermark will be installed with the construction of Plan B.

WPCP Fence Enhancement

17

Add image of award

Pedestrian Bridge

18

∗ Upcoming Alexandria park improvements∗ Berkeley Site plan∗ Dominion Power 230 Kv Line∗ Potomac Yard North∗ Four Mile Run Valley process - Shirlington/Nauck

town square/Jennie Dean Park Planning

Related Updates

19

Discussion on the next phase of the Four Mile Run Restoration Project

Next Steps

20

Questions?