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A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Royal Lake Dredging and Restoration Project
Pardon Our Dust Meeting
May 9, 2016
Royal Lake Dredging and Restoration
2
Agenda
• Opening Remarks – Supervisor Cook
• Project Background - Stormwater Planning Division
– Background
– Major Project Elements
– Summary of previous Pohick watershed dredging projects –
Lake Barton, Huntsman Lake, and Woodglen Lake
• Maintenance of Traffic, Trail Management, Tentative Construction Schedule –
ASI Constructors
• Royal Lake Biology and fish save efforts – Stormwater Planning Division
• Construction Timeline Summary and Safety during construction – Stormwater
Planning Division, Utilities Design and Construction Division, Park Authority
• Q&A
Royal Lake Dredging and Restoration
3
Royal Lake – Quick Facts
• Drainage area =
2,477 Acres (3.67 square miles)
• Lake surface area =
37.5 acres
• Sediment pool capacity =
416,000 cubic yards (CY)
• Current sediment in lake =
100,400 CY
• Estimated annual sediment load =
4,400 CY / year
50 feet
100,400 CY
Royal Lake Dredging and Restoration
4
Items of Work
 Dredging up to 51,220 CY of sediment (Phase I area)
 Access road improvement
 Demolition of the existing decanting basin fence and dewatering
structures
 Regrading of the existing decanting basin
 Temporary construction of a staging area and safety fence
 E&S and Control of Water measures
 Construction of two sediment forebay berms/weirs
 Construction of 340 feet of shoreline stabilization
 Construction of 130 feet of stream bank stabilization
 Installation of one new ACB ramp
 Replacement of an existing boat ramp with ACB ramp
 Installation of 65 fish habitat structures
 Restoration, seeding and landscaping of disturbed areas
Royal Lake Dredging and Restoration
5
Scope of Work
A1 A2
B2B1
Zone Volume (CY)
A1 33,500
A2 5,600
B1 12,000
B2 3,800
Royal Lake Dredging and Restoration
6
Water Depth
Royal Lake Dredging and Restoration
7
Grading Plan
Royal Lake Dredging and Restoration
8
Grading Plan
Royal Lake Dredging and Restoration
9
Sediment Disposal Site – I-95 Landfill Complex
Royal Lake Dredging and Restoration
10
Alternate disposal site – Noman Cole Pollution Control Plant
Royal Lake Dredging and Restoration
11
Decanting Basin Restoration
Restored Decanting
Basin
Royal Lake Dredging and Restoration
12
Royal Lake – Riser Modifications, Existing and Proposed Lake Bottom
• The riser modifications will
facilitate drawdown for future
maintenance dredging and also
includes a deep water release
mechanism for improving
downstream water quality.
• Proposed lake bottom will restore
the estimated original contours
and depth of the lake (in Phase I
area).
Royal Lake Dredging and Restoration
13
Shoreline Restoration: Existing Condition
Royal Lake Dredging and Restoration
14
Shoreline Protection
Royal Lake Dredging and Restoration
15
Placement of Fish Habitat Structures
TREE BRANCH PILES
Rock Rubble Piles
Royal Lake Dredging and Restoration
16
Stream Stabilization
Pohick Creek
Dredging and Lake Restoration Projects
Project Goals
• Restore sediment pool capacity
– Downstream water quality benefits
– Aesthetics
• Improve lake water quality and habitat
• Provide long term maintenance improvements
Lake Barton: 2011
Huntsman Lake: 2014
Woodglen Lake: 2015
Royal Lake: 2016
Sources of Sediment
Dredging Alternatives
1. Mechanically dredge deposited
sediment and haul wet
2. Drain lake and dry deposited
sediment in place before hauling
Lake Barton Dredging in Progress
Disposal Site – Sediment Reuse
• Topsoil for landfill cover
• Topsoil product for resale
Huntsman Lake Dam Rehabilitation Project
Fish Relocation (May 2013)
Huntsman Lake - Forebays
bank stabilization
aquatic bench
forebay
forebay berms
maintenance access
sanitary sewer
dam
embankment
Royal Lake Dredging and Restoration
24
Some Photos from the Huntsman Lake Dredging Project
Royal Lake Dredging and Restoration
25
Some Photos from the Huntsman Lake Dredging Project
Royal Lake Dredging and Restoration
26
Some Photos from the Huntsman Lake Dredging Project
Royal Lake Dredging and Restoration
27
Some Photos from the Huntsman Lake Dredging Project
Royal Lake Dredging and Restoration
28
Some Photos from the Huntsman Lake Dredging Project
Royal Lake Dredging and Restoration
29
Some Photos from the Huntsman Lake Dredging Project
Royal Lake Dredging and Restoration
30
Some Photos from the Huntsman Lake Dredging Project
Royal Lake Dredging and Restoration
31
Some Photos from the Huntsman Lake Dredging Project
Woodglen Lake Dredging and Restoration
32
Major Project Elements
Improved access
road
Sediment forebay
Lake dredging,
shoreline restoration,
lake habitat improvement
Removal and
restoration of decanting
basin
Reforestation areas
Stream stabilization
Riser modifications
Woodglen Lake Dredging and Restoration
33
Lake Drawdown
Woodglen Lake Dredging and Restoration
The Lake After Draining
Woodglen Lake Dredging and Restoration
Capital Facilities / Utilities Design and Construction Division / Transportation and Stormwater Construction Branch
Sediment Near the Forebay – To Be Removed
Woodglen Lake Dredging and Restoration
Capital Facilities / Utilities Design and Construction Division / Transportation and Stormwater Construction Branch
Sediment Being Loaded
Royal Lake Dredging and Restoration Project: Pardon Our Dust Meeting May 9, 2016
http://www.pwmag.com/erosion-control/dredging-up-savings_o_3.aspx
Woodglen Lake Dredging and Restoration
Capital Facilities / Utilities Design and Construction Division / Transportation and Stormwater Construction Branch
Forebay Berm
Woodglen Lake Dredging and Restoration
Modifications & Repairs – Principal Spillway Riser
Woodglen Lake Dredging and Restoration
Capital Facilities / Utilities Design and Construction Division / Transportation and Stormwater Construction Branch
Stream Restoration Work – Lake Inlet
Royal Lake Dredging and Restoration
42
Site Access and Maintenance of Traffic Plan
Pommeroy Drive
Access Point
Gainsborough
Drive Access Point
Royal Lake Dredging and Restoration
43
Neighborhood Truck Route
Royal Lake Dredging and Restoration
44
Trail Management Plan
Royal Lake Dredging and Restoration
45
Royal Lake Biology
• Reptiles and Amphibians
• Fish
• Benthic organisms (bottom layer)
– Birds & mammals feeding on mussels
Frogs and Toads
46
http://www.fcps.edu/islandcreekes/ecology/bullfrog.htm
https://www.flickr.com/photos/dah_professor/3674098110
/
http://capeannvernalpond.org/american-toad/
http://www.virginiaherpetologicalsociety.com/id
entification-keys/id-keys-frogs/Pseudacris.html
Frog/toad response to prior lake de-watering
• Huntsman Lake
– “Never have I seen such a plague of toadlets.”
(Resident in Huntsman area)
• Bradley Acres Pond
– Retrofitted SWM Wet pond
– “It’s biblical,” said a resident
• Predaceous diving beetles
• Toads and toadlets
• 5-lined skinks
47
Turtles
48http://www.virginiaherpetologicalsociety.com/reptiles/turtles/yellow-bellied-slider/Yellow-
bellied%20Slider%20(Trachemys%20scripta).jpg
http://www.virginiaherpetologicalsociety.com/reptiles/turtles/northern-red-bellied-
cooter/northern_red-bellied_cooter.php
http://www.virginiaherpetologicalsociety.com/reptiles/turtles/turtles_of_virgi
nia.htm
http://www.virginiaherpetologicalsociety.com/reptiles/turtles/red-eared-
slider/red-eared.JPG
Fishes – Electrofishing
49
Fishes – Electrofishing
50
Fishes – Electrofishing
51
Fishes
52
Fishes
53
Fishes
54
Fishes - Release
55
56
Freshwater Mussels – Mussel Life Cycle
http://www.fishwild.vt.edu/mussel/research/life_history.html
Pyganodon cataracta and Utterbackia imbecilis
57
Eastern Floater
P. cataracta
Paper Pondshell
U. imbecillis
Woodglen Lake Dredging and Restoration
Project Benefits
• Removed over 40,000 CY of sediment
• Facilitated future maintenance dredging operations by:
• Providing a 9,000 CY sediment forebay
• Improving the existing access road
• Providing truck staging areas
• Provided improvements and repairs for the principal spillway riser
• Installed fish habitat structures within the lake
• Provides the following annual (estimated ) reductions in the downstream
sediment and nutrient loadings:
• Total Suspended Solids (TSS) 14.6 tons/year
• Total Nitrogen (TN) 1,075 lbs/year
• Total Phosphorus (TP) 67 lbs/year
Royal Lake Dredging and Restoration
59
• Lake drawdown Scheduled to begin week of May 9th
(this week!)
• Dredging activities to commence by mid-June, 2016
• Project duration: 12 months
• Lake will remain mostly drained for entire project
• Lake filling after project completion is dependent on
rainfall conditions, and it is expected filling will be
initiated by June, 2017
Summary of construction timeline
Royal Lake Dredging and Restoration
60
Lake Drawdown and Safety
Royal Lake Dredging and Restoration
61
Lake Drawdown and Safety
Royal Lake Dredging and Restoration
62
Safety During Construction
• Contractor is required to comply with Fairfax County’s
Construction Safety Resolution.
• For all residents, keeping safe means following two
simple rules:
1. Please stay outside the construction limits at all times!
2. Observe construction activities from a safe distance.
Royal Lake Dredging and Restoration
63
Contact information
Stormwater Planning Division
703-324-5500, TTY 711 or by email:
Joe Riley-Ryan: Joseph.Riley-Ryan@fairfaxcounty.gov
Dipmani Kumar: Dipmani.Kumar@fairfaxcounty.gov
Utilities Design and Construction Division
703-324-5111, TTY 711 or by email:
Bill Nolan: William.Nolan@fairfaxcounty.gov
Thank you.

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Royal Lake Dredging and Restoration Project: Pardon Our Dust Meeting May 9, 2016

Editor's Notes

  1. Built in 1973 as a flood-control dam