West_Basin_Scour_Repairs_Phase_2_Plans_-_For_Solicitation.pdf

FOR SOLICITATION

EXISTING GRADE

FROM KEY CONSTRUCTION

EXCAVATED MATERIAL

WIDTH VARIES

TIE R-400 RIPRAP INTO RTB

THAN 1.5H:1V

NOT STEEPER

SLOPE VARIES

OF 2.5'

MIN. THICKNESS

R-400 RIPRAP

R-400 RIPRAP

1H:1V 1H:1V

FLOOD SIDE LEVEE TOE

EXISTING GRADE

FROM KEY CONSTRUCTION

EXCAVATED MATERIAL

WIDTH VARIES

TIE R-400 RIPRAP INTO RTB

THAN 1.5H:1V

NOT STEEPER

SLOPE VARIES

OF 2.5'

MIN. THICKNESS

R-400 RIPRAP

R-400 RIPRAP

1H:1V 1H:1V

FLOOD SIDE LEVEE TOE

KEY CONSTRUCTION

EXCAVATED MATERIAL FROM

RTB

OF 2.5'

MIN. THICKNESS

R-400 RIPRAP

EXISTING GRADE

HORIZONTAL OFFSET OF KEY = 50'

KEY

KEY CONSTRUCTION

EXCAVATED MATERIAL FROM

RTB

OF 2.5'

MIN. THICKNESS

R-400 RIPRAP

EXISTING GRADE

KEY

HORIZONTAL OFFSET OF KEY = 50'

SEE KEY DETAIL A

SEE KEY DETAIL B

SEE NOTE 6 BELOW.

WATER SURFACE ELEVATION

SEE NOTE 6 BELOW.

WATER SURFACE ELEVATION

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380 380

-260 -240 -220 -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 20 40 60 80

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KEY DETAIL A

KEY DETAIL B

0 020' 40' 20' 40'

TYPICAL CROSS SECTION

PROTECTED SIDE

B

/LC

/L

R T

B

FLOOD SIDE

TYPICAL CROSS SECTION

PROTECTED SIDEFLOOD SIDE

B

/LC

/L

R T

B

SCALE: NTS

B C

HORIZONTAL SCALE:1"=20' VERTICAL SCALE:1"=20'

0 020' 40' 20' 40'

HORIZONTAL SCALE:1"=20' VERTICAL SCALE:1"=20'

SCALE: NTS

B C

C-300

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1.5 H

1.5 H

1V

1V

C) THE KEY BOTTOM WIDTH SHALL BE 1.5', DIMENSION C.

FROM THE EXCAVATION POINT SHOWN IN THE KEY DETAIL, DIMENSION B.

B) THE DEPTH OF THE KEY SHALL BE 4 FEET BELOW EXISTING GRADE

POINT SHOWN IN THE KEY DETAIL.

THE RIGHT TOP BANK (RTB) TO THE BOTTOM OF KEY EXCAVATION

A) HORIZONTAL OFFSET OF KEY DISTANCE SHALL BE MEASURED FROM

NOTES:

C) THE KEY BOTTOM WIDTH SHALL BE 1.5', DIMENSION C.

FROM THE EXCAVATION POINT SHOWN IN THE KEY DETAIL, DIMENSION B.

B) THE DEPTH OF THE KEY SHALL BE 4 FEET BELOW EXISTING GRADE

POINT SHOWN IN THE KEY DETAIL.

THE RIGHT TOP BANK (RTB) TO THE BOTTOM OF KEY EXCAVATION

A) HORIZONTAL OFFSET OF KEY DISTANCE SHALL BE MEASURED FROM

NOTES:

MAX SLOPE 5H:1V

SLOPE TO DRAIN

MAX SLOPE 5H:1V

SLOPE TO DRAIN

SURFACE ELEVATION AT THE TIME OF CONSTRUCTION. STAGE HYDROGRAPHS ARE PROVIDED ON SHEET X-100.

SEA 1600801 SURVEY WAS COMPLETED AND IS SHOWN FOR REFERENCE ONLY AND SHOULD NOT BE USED TO DETERMINE OR ANTICIPATE THE WATER

6) THE WATER SURFACE ELEVATION SHOWN IN THE TYPICAL CROSS SECTIONS WAS THE WATER SURFACE ELEVATION AT THE TIME WHEN THE 2017

DURING THE PROJECT.

TYPICAL CROSS SECTIONS ARE BEING PROVIDED IN ORDER TO SHOW DIFFERENT EXISTING GRADE SCENARIOS THAT THE CONTRACTOR MAY SEE

5) THE TYPICAL CROSS SECTIONS PROVIDED SHOW THE SAME CONSTRUCTION REQUIREMENTS FOR REPAIRING ALL OF THE SCOUR SITES. TWO

EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION IS SEEDED & MULCHED ACCORDING TO THE PROJECT SPECIFICATIONS.

4) CONTRACTOR SHALL ENSURE THE SPOIL AREAS LOCATED IN BETWEEN THE CHANNEL RIGHT TOP BANK AND FLOOD SIDE LEVEE TOE THAT RECEIVE

BE PLACED AS SEMI-COMPACTED BACKFILL AS SPECIFIED IN THE PROJECT SPECIFICATIONS.

RIGHT TOP BANK AND FLOOD SIDE LEVEE TOE SHALL NOT EXCEED A MAXIMUM FINAL THICKNESS OF 1'. THIS EXCAVATED MATERIAL SHALL ALSO

3) THE EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION THAT IS PLACED IN THE SPOIL AREAS LOCATED IN BETWEEN THE CHANNEL

EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION WHEN PLACED IN THE SPOIL AREAS SHALL BE NO STEEPER THAN 5H:1V.

IN THE SPOIL AREAS SHALL BE DETERMINED IN THE FIELD BY THE CONTRACTING OFFICER. HOWEVER THE MAX ALLOWABLE FINAL SLOPE OF THE

THE CHANNEL RIGHT TOP BANK FOR THE DURATION OF THE PROJECT. THE SPECIFIC GRADE OF THE EXCAVATED MATERIAL WHEN IT IS PLACED

LOCATED IN BETWEEN THE CHANNEL RIGHT TOP BANK AND FLOOD SIDE LEVEE TOE IS SLOPED TO DRAIN AWAY FROM THE LEVEE AND TOWARDS

2) CONTRACTOR SHALL ENSURE THAT THE EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION THAT IS PLACED IN THE SPOIL AREAS

SCOUR REPAIR SITES. THE APPROXIMATE LEVEE BASELINE STATION LIMITS FOR EACH OF THE SCOUR REPAIR SITES CAN BE FOUND ON SHEET G-002.

BE TRANSITIONED DOWN TO ITS FULL DEPTH FROM EXISTING GRADE AT THE START AND END LEVEE BASELINE STATION LIMITS FOR EACH OF THE

1) THE RIPRAP KEY SHALL BE EXCAVATED TO ITS FULL DEPTH FOR THE ENTIRE LENGTH OF EACH OF THE SCOUR REPAIR SITES. THE KEY SHALL NOT

NOTES:

SURFACE ELEVATION AT THE TIME OF CONSTRUCTION. STAGE HYDROGRAPHS ARE PROVIDED ON SHEET X-100.

SEA 1600801 SURVEY WAS COMPLETED AND IS SHOWN FOR REFERENCE ONLY AND SHOULD NOT BE USED TO DETERMINE OR ANTICIPATE THE WATER

6) THE WATER SURFACE ELEVATION SHOWN IN THE TYPICAL CROSS SECTIONS WAS THE WATER SURFACE ELEVATION AT THE TIME WHEN THE 2017

DURING THE PROJECT.

TYPICAL CROSS SECTIONS ARE BEING PROVIDED IN ORDER TO SHOW DIFFERENT EXISTING GRADE SCENARIOS THAT THE CONTRACTOR MAY SEE

5) THE TYPICAL CROSS SECTIONS PROVIDED SHOW THE SAME CONSTRUCTION REQUIREMENTS FOR REPAIRING ALL OF THE SCOUR SITES. TWO

EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION IS SEEDED & MULCHED ACCORDING TO THE PROJECT SPECIFICATIONS.

4) CONTRACTOR SHALL ENSURE THE SPOIL AREAS LOCATED IN BETWEEN THE CHANNEL RIGHT TOP BANK AND FLOOD SIDE LEVEE TOE THAT RECEIVE

BE PLACED AS SEMI-COMPACTED BACKFILL AS SPECIFIED IN THE PROJECT SPECIFICATIONS.

RIGHT TOP BANK AND FLOOD SIDE LEVEE TOE SHALL NOT EXCEED A MAXIMUM FINAL THICKNESS OF 1'. THIS EXCAVATED MATERIAL SHALL ALSO

3) THE EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION THAT IS PLACED IN THE SPOIL AREAS LOCATED IN BETWEEN THE CHANNEL

EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION WHEN PLACED IN THE SPOIL AREAS SHALL BE NO STEEPER THAN 5H:1V.

IN THE SPOIL AREAS SHALL BE DETERMINED IN THE FIELD BY THE CONTRACTING OFFICER. HOWEVER THE MAX ALLOWABLE FINAL SLOPE OF THE

THE CHANNEL RIGHT TOP BANK FOR THE DURATION OF THE PROJECT. THE SPECIFIC GRADE OF THE EXCAVATED MATERIAL WHEN IT IS PLACED

LOCATED IN BETWEEN THE CHANNEL RIGHT TOP BANK AND FLOOD SIDE LEVEE TOE IS SLOPED TO DRAIN AWAY FROM THE LEVEE AND TOWARDS

2) CONTRACTOR SHALL ENSURE THAT THE EXCAVATED MATERIAL OBTAINED FROM THE KEY CONSTRUCTION THAT IS PLACED IN THE SPOIL AREAS

SCOUR REPAIR SITES. THE APPROXIMATE LEVEE BASELINE STATION LIMITS FOR EACH OF THE SCOUR REPAIR SITES CAN BE FOUND ON SHEET G-002.

BE TRANSITIONED DOWN TO ITS FULL DEPTH FROM EXISTING GRADE AT THE START AND END LEVEE BASELINE STATION LIMITS FOR EACH OF THE

1) THE RIPRAP KEY SHALL BE EXCAVATED TO ITS FULL DEPTH FOR THE ENTIRE LENGTH OF EACH OF THE SCOUR REPAIR SITES. THE KEY SHALL NOT

NOTES:

B

A

N.T.S.

EROSION CONTROL BERM DETAIL

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US Army Corps

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SILT FENCE DETAIL

N.T.S.

C-500

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SECURED AT A SUPPORT POST.

6" MINIMUM OVERLAP AND BE

SPLICED JOINTS SHALL BE A

NOTE:

6' MAX.

RUNOFF

4"6"

EARTH BACKFILL

END OF FABRIC

OF FABRIC

10" BURIED END

APPROVED EQUAL

WOODEN POST OR

FABRIC

FILTER

FABRIC

OVERLAPPING

END OF

GROUND LINE

RUNOF

F

34" MAX.

16" MIN.

GROUND SURFACE

DRIVE POST 24" BELOW

EQUAL - 5' MIN. LENGTH.

WOODEN POST OR APPROVED

7) FIELD ADJUSTMENTS ALLOWED AS NECESSARY TO ENSURE PROPER PLACEMENT AND FUNCTION.

SILT FENCE AND STABILIZE WITH PERMANENT SEEDING AND MULCHING.

6) UPON CONSTRUCTION COMPLETION, PRIOR TO FINAL ACCEPTANCE, REMOVE ALL EROSION CONTROL BERM AND/OR

5) SILT FENCE SHALL BE PLACED ALONG SLOPE CONTOURS TO MAXIMIZE PONDING EFFICIENCY.

AND CAN BE PERMANENTLY STABILIZED.

4) REMOVED SEDIMENT SHALL BE DEPOSITED TO AN AREA THAT WILL NOT CONTRIBUTE SEDIMENT OFF-SITE

REACH 1/3 THE HEIGHT OF THE SILT FENCE BARRIER.

3) INSPECT AND REPAIR SILT FENCE AFTER EACH STORM EVENT. SEDIMENT SHALL BE REMOVED WHEN DEPOSITS

2) SILT FENCE MAY BE USED IN LIEU OF EROSION CONTROL BERM.

BY THE SPECIFICATIONS.

BERMS TO COMPLY WITH THE DESIGN GRADE REQUIREMENTS AS SHOWN IN THE PLANS AND AS REQUIRED

1) UPON CONSTRUCTION COMPLETION AND PRIOR TO FINAL ACCEPTANCE, REGRADE ALL EROSION CONTROL

NOTES:

EXISTING GRADE

0.5' MIN

1' MIN

1' MIN