Greenbrier-Package6-ConstructionDrawings-REV-11-18-17_Cover_SCE_Signed.pdf

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G re en br ie r C ou nt y, W es t V irg in ia H an ki ns

B la nk en sh ip s Si te s

C ov er S he et

1. Cover Sheet

2. Quantities & Construction Notes

3. Hankins Location Map

4. Hankins Plan View

5. Blankenship Location Map

6. Blankenship Plan View

7. 7.5 Ft Gabion Typical Section

8. 7.5 Ft Counterfort

9. Gabion Details

10. Loose Rock Riprap Foundation Preparation

11. Foundation Preparation on Shallow Bedrock

12. Typical Channel Bottom Configuration

Greenbrier County

UTILITY NOTIFICATION

"The Natural Resources Conservation Service makes no representation as to the existence or non-existence of any utilities at the construction site. Shown on these construction drawings are those utilities which have been identified. It is the responsibility of the contractor(s) to assure themselves that no hazard exists or damage will occur to utilities."

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CONSTRUCTION NOTES

1. Access roads shall be restored to pre-construction condition or better.

2. All fences removed and/or damaged as a result of the contractor's operations shall be restored to a condition equal to or better than they existed before the start of work.

3. Soil compacted as a result of construction operations shall be loosened for a depth of

6-inches below the compacted soil layer and re-graded to blend with existing ground.

4. Provide sub-channel as shown on Typical Channel Bottom Configuration drawings.

5. While working in the stream all efforts will be made to reduce downstream impacts including keeping the excavator tracks elevated above flowing water. A diversion berm shall be established at the top of each stream access point to minimize surface water from flowing toward the stream.

6. Site access shall be off the main road and shall be in accordance with all West Virginia Department of Highways rules and guidelines. The contractor shall provide signage and flagmen for traffic control as required.

7. Excess material from the excavation & obstruction removal shall be wasted off-site in accordance with all local, state, & federal regulations and as approved by the NRCS representative in the field.

8. The contractor shall provide approved fill as required to complete the work.

9. Trash, tires, & woody debris within the work limits shall be disposed of off-site in an approved landfill. The contractor shall be responsible for the landfill tipping fees.

10. All pipes encountered in the embankment shall be extended through the riprap and/or gabions with the same pipe material or better to the face of the slope or baskets.

11. Pipes 12" in diameter and larger shall be encased in a minimum of 6" of concrete when passing through rock riprap. Concrete shall be Class 2500.

12. The contractor shall maintain the cleanliness of public and private roads impacted by hauling operations during the duration of the work.

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Q ua nt iti es

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Hankins Site Location Lat N 37° 59' 59" Long W 80° 39' 52"

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Hankins Plan View

50' Stream Width

75' of Gabion Baskets 7.5' High

An jea n Ro ad

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Scour Area to be Backfilled with Suitable Material

Well

Flow

Flow

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Blankenship Site Lat N 38 4' 32"

Long W 80 24' 58"

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5.5'

9.5

6°

TYPICAL GABION WALL 7.5 FEET HIGH

Geotextile

Provide Positive

Drainage

Excavation Limits, Backfill After Gabion Installation

Finished Grade Stream Bottom

2' Min.

2' Min. Embedment or to Bedrock, Whichever is Less

If Bedrock is Less than Two Feet, then See Foundation Preparation on Shallow

Bedrock ( Rebar Anchoring Detail)

6'x3'

4.5'x3'

1.5'

1.5'

1' Minimum

0.67'

Excavation Limits, Backfill After Gabion

Installation

Bottom Width Varies

3'x1.5'

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18"

12 Ft.

18"

Counterfort 7.5' Gabion Wall

TYPICAL COUNTERFORT DETAILS

7.5 FT. GABION WALL

Stream Channel

1. Refer to Quantities & Notes Sheet for estimated quantities.

2. Counterforts required: -3 on the Blankenship Site -3 on the Hankins Site

3. See wall typical section for additional details.

9'x3'x1.5'

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3'

4.5'

6'

Layer 1

Layer 2

Layer 3

Layer 3 Layer 2 Layer 1

6' 4.5' 3'

Fr on t F ac e

Fr on t F ac e

Fr on t F ac e

6' 4.5' 3'

12' 12' 12'

6x3x3

6x3x3

9' Wall as Example

3' Wall Base6' Wall Base9' Wall Base

Gabion Wall Base Layout No Scale

Gabion Wall Isometric No Scale

12x4.5x3

(1 2, 9, or

)x

3x 3'

6x3x3

(1 2, or

)x

4.

5x

3'

1/3 H

1/3 H

1/3 H

1/3 L 1/3 L

1/3 L 1/3 W

1/3 W 1/3 W

INTERIOR SUPPORT DETAIL

LACING DETAIL

1. Each vertical seam shall be laced prior to setting basket in place and prior to lacing to adjoining baskets.

2. Each basket shall be laced to the adjoining basket at all vertical edges and horizontal edges.

3. Each diaphragm shall be laced to the lid of the basket after closing. Diaphragm shall be laced along all sides.

4. All lacing shall be done with 13.5 gauge wire using the two, one, two, looping procedure as shown in the lacing detail.

5. All wire shall be tightly laced and the ends of the lacing wire shall be doubled back and twisted not less than three turns around itself in a length not greater than one inch.

6. Welded wire baskets shall be laced with spiral binders according to manufacturers recomendations.

7. Install according to manufacturers recommendations.

5" 5"

Wire Doubled Back and Twisted

Horizontal Edge

Vertical Seam

Horizontal Edge

6x3x3'

6x3x3'

6x3x3'

6x3x3'

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G ab io n

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Varies 9.5

6°

Gabion Section on Riprap Foundation

Geotextile

Provide Positive

Drainage

Finished Grade Stream Bottom

Depth of Rock of Foundation to be Determined by NRCS

Representative in Field.

Foundation Preparation Payment Limits

( Varies with Gabion Configuration)

Rock Riprap Foundation Preparation 6"-18" Gradation

1. See Typical Channel Bottom Configuration Sheet.

2. Refer to Sheet 2 for Estimated Quantities.

3. Actual Gabion configuration may vary.

3' Min.

3' Min.

Geotextile

Excavation Limits, Backfill After Gabion Installation

Excavation Limits, Backfill After Gabion

Installation

1.5'

1.5'

7"

3' max or to Bedrock

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Lo os e R oc k

R ip ra p

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Bedrock

Foot Print of Planned Gabions & Rebar/Drillhole Pattern

1' Max

Varies

Front Face of Proposed Gabions with Rebar Spacing

1' Max

1' Min to 1.5' Max

1' Min to 1.5' Max Typical Each Side

Side View of Proposed Gabions with Rebar Spacing

Maximum Angle of Rebar/Drillhole Pattern

15°

Back of BasketFront of Basket

Bedrock

Bedrock

Vertical No. 10 Rebar

Max Tilt of Rebar/Drillhole

Back of BasketFront of Basket BackfillStreamside

0' to 2' Max

Stream Bottom

0' to 2.0' Max

Note:

1. Drill holes for Rebar shall be 1 3/8" diameter. The use of epoxy or non-shrink grout is not required.

The rebar shall be driven by hammer to the required depth without bending.

2. Care shall be taken by the contractor to prevent damage to the rebar during gabion filling operations.

3. Different gabion bottom basket configurations will require additional rebar by repeating the pattern shown.

Foundation Preparation Payment Limits

Varies

Varies

Stream Bottom

1.25'No. 10 Rebar Typical

1.25' 1.25'

No. 10 Rebar Typical

2.5' Max.

1.25'

2.5' Max.

2.5' Max. 2.5' Max.

Foundation Preparation Payment Limits

4.5'

2.5'

1.5'

Varies

2.5'

No. 10 Rebar

~1.5'

~2.5'

FOUNDATION PREPARATION on SHALLOW BEDROCK (Use When Bedrock is Less than Two Feet From Stream Bottom)

No Scale

1' Min to 1.5' Max

1.5'

2.5'

Note: Final pattern and spacing to be directed by NRCS technician in the field.

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1/3 BW

~ 1

(See Site Plan)

Provide Positive Drainage

~2

~1

~1

Final Stream Bottom Shall be Rough & Irregular Provide Positive Drainage Toward Subchannel

Deposition (Varies)

Existing Groundline

Subchannel

Bottom Width (BW)

Notes:

1. Final location of subchannel to be located in the field by the NRCS representative. The subchannel shall be transitioned as necessary to meet existing grades at the upstream and downstream site extents.

2. Subchannels are not required for bedrock streambeds.

3. Use material from the required excavations and/or approved fill from offsite to reconstruct streambanks as necessary. Seed and Mulch per construction specification 6, Seeding, Sprigging and Mulching.

4. Actual gabion configuration and height may vary.

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