PROPOSED: PLACEMENT OF LARGE WOODY AND WATER …

© 2010 NAVTEQ © AND © 2017 Microsoft Corporation

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ADJACENT PROPERTY OWNERS:1 - U.S. DEPARTMENT OF AGRICULTURE/ U.S. FOREST SERVICE2 - SNOHOMISH COUNTY3 - NORTH CENTRAL CONSTRUCTION, INC.

NAME: GOLD BASIN HABITAT RESTORATIONPURPOSE: RESTORATION AND IMPROVEMENT OF SALMON HABITATAND WATER QUALITY, AND WETLAND EXPANSION IN THE SOUTH FORKSTILLAGUAMISH RIVER.DATUM: NORTH AMERICAN VERTICAL DATUM OF 1988LATITUDE: 48.07982NLONGITUDE: -121.73334WS-T-R: 13/14-30N-8ESITE LOCATION ADDRESS: NF-4018 GRANITE FALLS, WA 98252

IN: SOUTH FORK STILLAGUAMISH RIVERNEAR/AT: GRANITE FALLS, WACOUNTY OF: SNOHOMISHSTATE: WASHINGTONDATE: DECEMBER 2020 SHEET: OF 11

PROPOSED: PLACEMENT OF LARGE WOODYDEBRIS STRUCTURES, EXISTING WETLANDEXPANSION, REDUCTION OF FINE SEDIMENTS, ANDCHANNEL REALIGNMENT. 1605 Cornwall Avenue

Bellingham, WA 98225360-733-4311

SKAGIT COUNTY

SNOHOMISH COUNTYCHELANCOUNTY

Gold Basin

Everett

I-5

HWY 2

HWY 9

Granite Falls

Arlington

DarringtonHWY530

HWY92 MT LOOP HWY

Not to Scale KING COUNTY

Project Location

1

Site and Vicinity Map

Gold BasinCampground

(USFS)

Mountain Loop Highway

S.F. Stillaguamish RiverFlow Direction

Mill Pond

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Existing Contours (5-Foot Intervals)

OHWM

Parcel Boundary

Campground Road

Existing River Flow Path

Lobe Drainage Flow Path

Wetland

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Bellingham, WA 98225360-733-4311

2

Existing Conditions Plan



Materials Staging Area onExposed Gravel Bar

Primary Site Access atCampground Main Entrance

Mill Pond

Gold Basin Campground(USFS)

Potential Staging atMill Pond Parking Area

Existing Wetland

Equipment Staging (No Materials Stockpile)in Existing Parking Lot and Adjacent Area

Materials Staging Area onExposed Gravel Bar

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Access and Staging Plan

LEGEND:

OHWM (Existing)

Parcel Boundary



Existing Campground Road

Project Limits (Approx.)

Access Route

Proposed Channel Cut/Grading Areato be Used as Access Corridor

Staging Area



Mill Pond

Install Temporary FlowDiversion Structure (Bulk Bagsor similar) to Isolate Flow fromNew Channel Inlet Work Area

Existing Wetland

During Phase 1 of WaterControl Plan, the New ChannelExcavation can Proceed withExcavated Material Used tobegin Fill Prism at Upland FillArea

During Phase 1 of WaterControl Plan, the New ChannelExcavation can Proceed withExcavated Material Used tobegin Fill Prism at WetlandExpansion Fill Area


Install Temporary FlowDiversion Structure (Bulk Bagsor similar) to Isolate Flow fromNew Channel Outlet Work Area


Flow Path Diverted to InsideEdge of New Channel

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Bellingham, WA 98225360-733-4311

4

Water Control Plan: Phase 1

Water Control Note: Prior toConstruction, Contractor will beRequired to Produce a DetailedWater Control Plan and Submitfor Approval.

LEGEND:

OHWM (Existing)

Parcel Boundary


Anticipated River Flow Path


Campground Roads to Remain


Proposed Water Control Isolation/Diversion Structure

Proposed Phase 1 Grading Limits



Mill Pond

Existing Wetland

Install Temporary Flow DiversionStructure (Bulk Bags or similar)to Isolate Flow from ExistingChannel Upland Fill Area

During Phase 2 of WaterControl Plan DiversionStructure to be Shifted toIsolate Existing Channel fromFlow and Accommodate Fill inRemaining Portion of UplandFill Area



Leave Central Fill Berm UntilProject Completion. To Smoothto Final Grade After Phase 2

Flow Path Diverted to InsideEdge of New Channel

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Water Control Plan: Phase 2

LEGEND:

OHWM (Existing)

Parcel Boundary


Anticipated River Flow Path


Campground Roads to Remain


Proposed Water Control Isolation/Diversion Structure

Proposed Grading Limits

Water Control Note: Prior toConstruction, Contractor will beRequired to Produce a DetailedWater Control Plan and Submitfor Approval.

Gold BasinCampground

(USFS)


S.F. StillaguamishRiver

Flow Direction

Mill Pond

ExistingChannel

Proposed Sediment Retention Basin

Proposed Sediment Retention Basins

Proposed Timber CribCheck DamsProposed Fill to Create Expanded Wetland

Proposed Upland Fill

Proposed Wetland Flow Spreader

Proposed Meander Jam

Proposed SedimentRetention Basins

Existing Wetland Proposed Timber CribCheck Dams

Proposed Live Crib

Proposed LWMBank Jam

Proposed Timber CribCheck Dam

Blend to Existing Grade

C'

B

A'

A

C

B'

Upland Fill Material Sourcedfrom Proposed ChannelExcavation

Expanded Wetland FillMaterial Sourced fromProposed ChannelExcavation

New Channel

Flow Direction

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Bellingham, WA 98225360-733-4311

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Proposed Conditions Plan

LEGEND:

OHWM (Proposed)

Campground Road

Existing Lobe Drainage Flow Path

Anticipated Post-Project Drainage Flow Path


Existing Wetland

Proposed Channel Grading (Cut)


Proposed Wetland Expansion (Fill)

Cross Section Location and Designation

Proposed Large Woody Material Placement

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A



10'

16' Typ.

Existing OHW

Existing Grade

Existing Grade

Elev. 1094.0'

Elev. 1094.0'

Proposed Meander Jam

Buried 7 ft. BelowProposed Channel Thalweg

Elev. 1091.0'

Drainage Channel

Vertical Log PolesBuried 5 ft. Below

Structure Base

5'

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Bellingham, WA 98225360-733-4311

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Cross Sections A-A'

LEGEND:

Existing Grade

Proposed Grade

Ordinary High Water (Existing)

Ordinary High Water (Proposed)


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B'

14.0' TYP.

Proposed Realigned Channel200'

250.0'

Existing River Channel (To Be Abandoned)6.3'

4.9'

-1.0%

Low Flow Notch

Proposed LWM Bank Jam

Proposed OHWLeft Bank2H:1V

Right Bank1H:1V

Existing Grade

Existing Grade

Existing OHW

Proposed Timber CribCheck Dam (Backfilled)

Backfill With Native Gravels

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Bellingham, WA 98225360-733-4311

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Cross Sections B-B'

LEGEND:

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Proposed Grade



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C'

-1.0%

14.0' Typ.

8.4' Typ.

Proposed Fill to Create ExpandedWetland (Background)

2:1 Typ. Proposed OHW

Proposed Wetland Flow Spreader

Existing Grade

Existing GradeProposed Wetland Flow Spreader

Existing OHW

Proposed Live Crib1:4 Typ.

Log Pole Buried5 ft. Below

Structure Base

5.0'

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Bellingham, WA 98225360-733-4311

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Cross Sections C-C'

LEGEND:

Existing Grade

Proposed Grade



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Bellingham, WA 98225360-733-4311

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Connection Details (1 of 2)

Notes:1. Drill 1" diameter hole at location shown on Layer 6. Make Threaded Rod Vertical Log Connection (1 Loc.) See Sheet 11.2. Drill 1" diameter hole at location shown on Layer 7. Make Threaded Rod Vertical Log Connection (1 Loc.) See Sheet 11.3. Start and finish each connection with steel plate and 2 nuts. See Threaded Rod Washer and Nut Connection Detail, Sheet

11.

Live Crib Connection

Notes:1. Drill 1" diameter hole at locations shown on Layer 1. Start Threaded Rod Stacked Vertical Connection (6 Locs.) See

Sheet 11.2. Finish Threaded Rod Stacked Vertical Connection on Layer 2 (6 Locs.). See Sheet 11.3. Start and finish each connection with steel plate and 2 nuts. See Threaded Rod Washer and Nut Connection Detail, Sheet

11.

Notes:1. Drill 1" diameter holes in Layers 1 and 2 (3 Locs.).2. Drill 1" diameter hole in buried log poles (3 Locs.).3. Complete Threaded Rod Vertical Log Connection on Layers 1

and 2 (3 Locs.) See Sheet 11.4. Drill 1" diameter holes in Layers 7 and 8 (4 Locs.).5. Drill 1" diameter hole in buried log poles (4 Locs.).6. Complete Threaded Rod Vertical Log Connection on Layers 7

and 8 (4 Locs.) See Sheet 11.7. Start and finish each connection with steel plate and 2 nuts.

See Threaded Rod Washer and Nut Connection Detail, Sheet11.

Layer 7

Layer 6

1.75'

Buried LogPole

0.5'

4.75'1

2

Layer 1Layer 2

1

2

4

5

Layer 7

Layer 8

8.5'

1.75'

1.75'

7.5'5.5'

Filler Log

2.0'

1.5'

1.75'

1

Layer 1

1

1.75'

1.5'

2.0'

1.75'

1.5'

Layer 2

2

2

2.25'

Meander Jam Connection

Timber Crib Cross Log Connection

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Bellingham, WA 98225360-733-4311

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Connection Details (2 of 2)

General Notes:1. All connections shall be approved by the engineer.2. Steel threaded rod shall be 7/8-inch grade 8 galvanized steel, meeting the requirements of

ASTM 354BD.3. Plates shall be galvanized steel and shall be sized to fit the threaded rod.4. Nuts shall be zinc yellow chromate-plated grade 8 and be sized to fit the threaded rod.5. Contractor shall submit shop drawings and product cut sheets for any proposed alterations to

the details shown on this sheet for approval by the engineer. Proposed alterations to the detailsshown on this sheet shall in the opinion of the engineer meet or exceed the design intent of theconnection.

12" Min.

6" Min.50% Dia.

50% Dia.

Buried LogPole

Drill hole nogreater than bar

dia +1/4"

Cut notch into logor pole allowing2" steel to lie flat

Buried Log Pole

Secure threaded rod with 7/8" galvanizedsteel nut and galvanized steel plate. See Threaded

Rod Connection Detail for more information.Drill through center oflog, normal toconnecting log

Bottom LogTop Log

Bottom Log

Top Log

Drill hole nogreater than

bar diameter+1/4"

Secure threaded rod with 7/8"galvanized steel nut and galvanizedsteel plate. See Threaded RodConnection Detail for more information

Galvanized steel plate orwasher min 2" width,min 0.235" thickness

(2x) Zinc plated steelnut, grade 8 steelwith zinc yellowchromate plating

Threaded rod to extendto minimum lengthneeded to attach plateand nut

Threaded rod toextend tominimum lengthneeded to attachplate and nut

Threaded Rod Washer and Nut Connection Detail

Section C-C'Plan

Log or Pile

Threaded Rod Vertical Log Connection Detail

Section A-A'Plan Section B-B'Plan

Threaded Rod Stacked Vertical Connection Detail

B B'A A'

CC

'

PROPOSED: PLACEMENT OF LARGE WOODY AND WATER …

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