Information presented at the public meeting included changes to the lake over time, dredging history, park master planning, the work team, schedule, contractor (Arcadis) and the field work plan.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
December 10, 2020
Project Overview
Braddock District
Lake Accotink Dredging

2. DPWES Stormwater Planning Division
Agenda and Presenters
2
Lake Accotink Dredging
 Introductory Comments
 Supervisor Walkinshaw
 Background (Dredging History and Park Master Planning)
 Charles Smith (DPWES)
 Overview
 Team
 Schedule
 Other Work Going On in the Area
 Arcadis Presentation of Field Work Plan for
Winter 2020-2021
 Mike Wooden (Arcadis)
 Frank Graziano (WSSI)
 Wes Thomas (Arcadis)
 Akshay Kumar (Arcadis)
 Amanda Kohler (Arcadis)
 Questions and Answers
 Adam Wynn (Park Authority)
 Susan Larcher (Arcadis)
Photo by Thomas Kinder July 2019 – with permission of Save Lake Accotink
Photo from
Friends of
Lake
Accotink
Park

3. LAKE ACCOTINK CHANGES OVER TIME
Concrete Dam Constructed
Initial Lake Volume: 811 ac-ft
* 1960s Dredge
(Volume Uncertain)
*1985 Dredge
Dredge volume:
211,000 cy
*
?*
 Lake Accotink has been dredged three times
over the past 40 years.
 Previous dredging was completed in May
2008 ($10 Mil.) and removed 193,000 CY of
Sediment.
 An average of 20,000 CY of sediment is
deposited in the lake per year.
 The estimated average depth of the lake is 4
feet and will continue to decrease over time
without intervention.
2008 Dredge
Dredge volume:
193,000 cy
3(Presented at the BOS Budget Committee Presentation September 17, 2019)

4. LAKE ACCOTINK MASTER PLAN PUBLIC ENGAGEMENT PROCESS
• Master Plan began Spring 2016
• 5 Public Meetings/Workshops held with Community
• Facilities, programming & Usage
• Natural and Cultural Resources
• Trails
• Lake Management
• Natural resource studies were conducted to inventory critical plant
and wildlife species
• Lake Options shared with the public
• Community Online Questionnaire for Lake Options was circulated
• Comments received though website, email, and by phone
4(Presented at the BOS Budget Committee Presentation September 17, 2019)

5. LAKE ACCOTINK PUBLIC ENGAGEMENT PROCESS
Outcomes
• Results of public input
• 90% favored having a lake
• 65% in favor of retaining the existing footprint
• Save Lake Accotink, a non-profit organization, submitted a
petition in favor of dredging the lake and constructing a forebay.
• HOAs adjoining Lake Accotink support retaining the lake.
5(Presented at the BOS Budget Committee Presentation September 17, 2019)

6. DPWES Stormwater Planning Division
Project Overview
6
Lake Accotink Dredging
Dredging Order of Magnitude Cost Estimate
Initial Dredging Contingency Total
$24.5M $6.0M $30.5M
Annual Costs
Maintenance
Dredging
Dam
Maintenance
Total
$2.0M $0.013M $2.013M
30 Year Lifecycle Dam Repair & Upgrades
$4.7M in Year 30
Dredging Cost: $ 30,500,000
Annual Maintenance Cost: $2,013,000
30 Year Lifecycle Dam Repair: $4,700,000
Description
• Dredge estimated 350,000 cubic yards of sediment
to restore lake to average 8 ft depth.
• Pump sediment to Wakefield Park for dewatering
and disposal.
• Establish maintenance dredging program to
sustain the lake.
• Retain aesthetic and recreation value of the lake.

7. DPWES Stormwater Planning Division
Project Team
7
Lake Accotink Dredging
Department of Public
Works & Environmental
Services
Charles Smith
Project Manager – Stormwater
Justin Pistore
Project Manager - Stormwater
Aaron George
Lake Management – Stormwater
Jay Horstman
Construction Management –
Capital Facilities
Tom Richardson
Sanitary Sewer Coordination –
Wastewater
Fairfax County Park
Authority
Valerie Maislin
Project Manager – Planning and
Development
Adam Wynn
Lake Accotink Park Master Plan
Project Manager – Planning and
Development
Dan Grulke
Lake Accotink Manager – Park
Services
Chris Goldbecker
Lake Front Park Manager – Park
Services
Amber Stramel
Area 2 Manager – Park Operations
Braddock District
Supervisor
Marcia Pape
Supervisor’s Aide
Arcadis
Team
Mike Wooden
Project Manager
Fernando Pasquel
Project Director
Doug Sawyers
Account Manager
Akshay Kumar
Assistant Project Manager
Wesley Thomas
Dredging & Materials Management
Amanda Kohler
Conveyance & Dewatering System
Shannon Dunn
Sediment Characterization & Water Quality
Susan Larcher
Public Outreach
Frank Graziano (WSSI)
Survey & Permitting
ECS
Geotechnical Analysis
Key Stakeholder
Groups
Friends of Lake Accotink Park
Friends of Accotink Creek
Save Lake Accotink
Homeowner & Civic
Associations
Lake Accotink Dredging
Critical Players

8. DPWES Stormwater Planning Division
What To Expect
8
Lake Accotink Dredging
 Data collection and survey to design
dredge and determine where dredge
operations could be done
 Site preparation in Lake Accotink &
Wakefield Parks
 Dredging, pipeline and spoils processing
operations
 Daily commercial truck traffic north of
Braddock Road to remove sediment
 Light vehicle traffic daily in Lake Accotink
Park to support dredging and pipeline
operations
 Restoration and monitoring

9. DPWES Stormwater Planning Division
Project Schedule
9
Lake Accotink Dredging
 Data collection and survey – April 2021
 Alternatives Analysis – July 2021
 Concept Design and Value Engineering
Study – April 2022
 Final Design and Permitting – March
2023
 Begin Dredging – March 2023
 Complete Dredging – November 2025
 Post Construction Monitoring – October
2028
Lake Accotink dredging operations June 21,
2006 – Photo by Fairfax County DPWES

10. DPWES Stormwater Planning Division
Things Going On Around Lake Accotink & Wakefield Park
10
Lake Accotink Dredging
Arcadis field work for Lake
Accotink Dredging Project
Accotink Creek at
Wakefield Park stream
restoration
VDOT survey work for Braddock
Road Corridor Project
Park Authority trail work near
Danbury Forest
Washington Gas utility
work near Rolling Road
Audrey Moore RecCenter
renovation

11. DPWES Stormwater Planning Division
Discussion
Discussion & Questions
11
Native mussels below Lake Accotink dam –
Photo by Friends of Accotink Creek
For Additional Information, to Comment or Sign up for Email
Updates, Please Visit the Project Web Page:
https://www.fairfaxcounty.gov/publicworks/lake-accotink-
dredging
Lake Accotink Dredging
Community stewardship – Photo by Friends
of Lake Accotink Park
Cardboard boat regatta – Photo
by Friends of Lake Accotink Park
Mallard ducks – Photo by Fairfax
County Park Authority