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Attached to
Big Bend Left Abutment Collector Pipe System Federal contract opportunity
Solicitation number
W9128F23B0005
Issued by
Department of the Army Corps of Engineers Engineering District Omaha

About this file

This federal solicitation seeks a contractor to replace the left abutment collector pipe system near the toe of the dam at Fort Thompson, South Dakota. The work includes dewatering the area, properly disposing of contaminated soil and water, excavating and removing slotted and solid pipes, placing a two-stage filter, installing manholes, backfilling, and seeding. The two-step IFB process will begin with Step One posted on December 1st, 2022 and proposals due by January 4th, 2023 at 2:00 PM Central Time. A tentative site visit is scheduled for December 12th, 2022 at 10:00 AM Central Time. The solicitation number is W9128F23B0005 and is being issued by the Department of the Army Corps of Engineers Omaha District.

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Text version

C-504

O U

T F

A L L D

E T

A

IL

S B

B

C

.D

G

NEYE BOLT DETAIL

NO SCALE

(APPLICABLE TO RELIEF WELLS RW-66R, RW-66AR, RW-66B)

(APPLICABLE TO RELIEF WELLS RW-67R, RW-68R, RW-68AR, AND RW-68BR)

DETAIL I - RELIEF WELL OUTFALL

DETAIL H - RELIEF WELL CASING OUTFALL

R E

P L

A C

E M

E N

T R

E L

IE

F W

E L

NO SCALE

CONNECTION DETAIL PLAN.

6. ALL CONNECTION TYPES AND DETAILS MUST BE APPROVED IN THE PIPE PRODUCTION AND

GEOSNYTHETIC MAT MUST BE LIMITED TO THE EXTENT REQUIRED FOR OUTFALL INSTALLATION.

WELL CHANNEL MUST BE REMOVED PRIOR TO EXCAVATION. REMOVAL EXTENTS OF

5. FOR RW-66R AND RW-66AR, THE EXISTING GEOSYNTHETIC MAT ON THE SLOPE OF THE RELIEF

4. OUTFALL LENGTHS ARE SUBJECT TO FIELD VERIFICATION AND AS BUILT LOCATIONS.

RELIEF WELLS WILL BE INSTALLED THIS CONTRACT.

AND WILL BE PROVIDED TO THE CONTRACTOR. CASING OUTFALLS FOR THE REPLACEMENT

AWARD ARE APPROXIMATE. FINAL LOCATIONS MAY VARY FROM WHAT IS SHOWN ON DRAWINGS

3. LOCATION OF REPLACEMENT RELIEF WELLS TO BE INSTALLED BY USACE PRIOR TO CONTRACT

DAMAGED.

2. CONTRACTOR MUST ENSURE THAT THE BENTONITE SEAL IS NOT EXCAVATED OR OTHERWISE

SPECIFICATION 02 61 13.

1. ALL CONTAMINATED SOILS WILL BE HANDLED AND DISPOSED OF IN ACCORDANCE WITH

:NOTES

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DOWNSTREAM

UPSTREAM

V A

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FLOW

APPLICABLE

MANHOLE, IF

INSTALL 36" I.D. HDPE CASING

(APPLICABLE TO ALL RELIEF WELLS, EXCEPT RW-66B (SEE NOTE 5 FOR RW-66R AND RW-66AR)

COLLECTOR PIPE

HDPE RELIEF WELL

NEW SOLID/SLOTTED

PLAN - TYPICAL REPLACEMENT RELIEF WELL CASING OUTFALL

(SEE NOTE 4)

HDPE PIPE

INSTALL 8"

(SEE NOTE 6)

HDPE PIPE

ATTACH 8" I.D.

WELL ELEVATION

7 FOR TOP OF RELIEF

RISER PIPE. SEE TABLE

CUT EXISTING STEEL

(SEE NOTE 2)

EXISTING BENTONITE SEAL

(SEE NOTE 3)

WELL INSTALLED BY USACE

REPLACEMENT RELIEF

36" DIAMETER HDPE CASING

TYPICAL DETAIL FOR SOLID WALL

3"

5"

1'- 0"

1' - 0"

2.5"

O U T S

ID

E O

F R

IS

E R

1/2"

1/2"

FOR RELIEF WELL CASINGS

ALUMINUM COVER DETAIL

NO SCALE

33 26 00.00 10

SPECIFICATION

REQUIRMENTS SEE

NOTE: FOR LOCKING

FLOW

(SEE NOTES 4 AND 5)

WELL CASING OUTFALL PIPE

INSTALL 8" HDPE RELIEF

EXISTING FILTERPACK

DEPTH VARIES, SEE NOTE 2.

EXISTING BENTONITE SEAL

BE REMOVED

SLURRY FILLING TO

EXISTING BENOTNITE

APPROXIMATE GROUND EL.

CHANNEL FILL

FINAL GRADE

DEPTH VARIES

INTERMITTENT ANCHORING

AND SEEDING

6" TOPSOIL

12" IMPERVIOUS FILL

EXISTING 3" GRAVEL

AGGREGATE

EXISTING 6" FINE

FINE AGGREGATE

EXISTING 6"

GRAVEL

EXISTING 6"

FILTER SAND

SEE THIS SHEET FOR DETAIL

INSTALL ALUMINUM COVER

AND SEEDING

6" TOPSOIL

2' MIN.

SEE REINFORCEMENT DETAIL.

REINFORCEMENT MID DEPTH.

BASE SLAB WITH #4

INSTALL 4'X4'X6" CONCRETE

AREAS. SEE NOTE 5.

TO BE REMOVED IN EXCAVATED

GEOSYNTHETIC MAT

WITH ANCHORED

EXISTING 3" GRAVEL

2" INTO CONCRETE SLAB.

EMBED 36" HDPE CASING

ELEVATION.

CUT EXISTING RISER PIPE TO FINAL

BACKFILL

RANDOM

BACKFILL

RANDOM

BACKFILL

RANDOM

BEDDING

FILTER SAND

COLLECTOR PIPE

NEW 18" HDPE

INSTALL 36" HDPE CASING

ELEVATION.

FOR OUTFALL INVERT

REFER TO TABLE 4

PIPE BEDDING DETAILS

SEE SHEET C-505 FOR

DOWNSTREAM

UPSTREAM

(SEE NOTE 6)

HDPE PIPE

ATTACH 8" I.D. 5

.7

RW-66B

COLLECTOR PIPE

NEW 18" HDPE

FLOW

F L O

W

PLAN - RELIEF WELL RW-66B CASING OUTFALL

(APPLICABLE ONLY TO RELIEF WELL OUTFALL RW-66B)

(SEE NOTE 4)

NEW 18" HDPE COLLECTOR PIPE

FROM RW-66B TO CONNECT TO

EXTEND EXISTING HDPE OUTFALL

FROM RW-66B

EXISTING OUTFALL

3/16" ALUMINUM DISC PLATE

6 1/2"

2"

3 7/8"

WELD

4 1/4" R.

1 1/16" R.

/4

WATERTIGHT WELD

RELIEF WELL VALVE ASSEMBLY DETAIL

DISC GUIDES

3/8" ALUMINUM ROD

NO SCALE

LIFTING HANDLE

WITH STAINLESS STEEL CLAMP TO CASING

ATTACH STAINLESS STEEL WIRE ROPE

SEE DETAIL THIS PAGE

RELIEF VALVE ASSEMBLY

SEE DETAIL THIS SHEET

INSTALL ALUMINUM COVER

(SEE NOTE 2)

EXISTING BENTONITE SEAL

FILTER SAND BEDDING

APPROX. GROUND ELEV.

TABLE 4 FOR INVERT ELEVATION.

OUTFALL PIPE (SEE NOTE 4) AND

8" SOLID CORRUGATED HDPE

(SEE NOTE 3)

WELL INSTALLED BY USACE

REPLACEMENT RELIEF

36" DIAMETER HDPE CASING

TYPICAL DETAIL FOR SOLID WALL

6"

2' MIN.

2" INTO CONCRETE BASE

EMBED 36" HDPE PIPE

NO SCALE

AND SEEDING

6" TOPSOIL

1'- 0"

O U T S

ID

E O

F R

IS

E R

SEE REINFORCEMENT DETAIL.

REINFORCEMENT MID DEPTH.

BASE SLAB WITH #4

INSTALL 4'x4'x6" CONCRETE

DETAIL, THIS SHEET

SEE EYE BOLT

RANDOM BACKFILL

RANDOM BACKFILL

LOCKING PURPOSES

IRON CHAIN FOR

3"

3"

3"

REINFORCEMENT DETAIL

RELIEF WELL CASING BASE SLAB

14" 14"

AT MID-DEPTH

REINFORCEMENT

INSTALL # 4

WITH NUT

3/8" EYE BOLT

HDPE WALL THICKNESS

DETAIL FOR EYE BOLT LOCATION

NOTE: SEE 36" HDPE CASING

APPROX. GROUND EL.

FLOW

DEPTH VARIES, SEE NOTE 2

EXISTING BENTONITE SEAL

2' MIN.

AND SEEDING

6" TOPSOIL

AGGREGATE

COARSE

AND SEEDING

6" TOPSOILAND SEEDING

6" TOPSOIL

FILTER SAND

BE REMOVED

SLURRY FILL TO

EXISTING BENTONITE

SEE DETAIL THIS SHEET

INSTALL ALUMINUM COVER

FILTERPACK

EXISTING

2" INTO CONCRETE SLAB.

EMBED 36" HDPE CASING

ELEVATION.

CUT EXISTING RISER PIPE TO FINAL

HDPE CASING

INSTALL 36"

BACKFILL

RANDOM

BACKFILL

RANDOM

BACKFILL

RANDOM

24" IMPERVIOUS BACKFILL

INVERT ELEVATION

FOR OUTFALL

REFER TO TABLE 4

SEE REINFORCEMENT DETAIL.

REINFORCEMENT MID DEPTH.

CONCRETE BASE SLAB WITH #4

INSTALL 4'x4'x6" CAST-IN PLACE

PIPE BEDDING DETAILS

SEE SHEET C-505 FOR

(SEE NOTE 4)

OUTFALL PIPE

RELIEF WELL CASING

INSTALL 8" HDPE

APPLICABLE

OUTLINE IF

MANHOLE

COLLECTOR PIPE

NEW 12" SLOTTED HDPE

COARSE AGGREGATE BEDDING

FILTER SAND BEDDING

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NOT TO SCALE

AGGREGATE

COARSE

VARIES12" 12" 12"12"

12"

MIN. 12"

FILTER SAND

12" FILTER SAND BEDDING

SEE NOTE 1.

REPOSE

ANGLE OF

12" COARSE AGGREGATE BEDDING (SEE NOTE 2)

6" TOPSOIL

DETAIL FOR SLOTTED HDPE FOR LEFT ABUTMENT COLLECTOR PIPE

(STATIONS 0+00 TO 7+20, 10+00 TO 13+03, 14+00 TO 15+04, 16+00 TO 16+73)

PIPE TYPES AND EXTENTS. ALSO SEE NOTE 4.

SLOTTED HDPE PIPE. SEE PROFILE SHEETS FOR

SEE NOTE 1

REPOSE

ANGLE OF

(SEE NOTE 5)

24" - IMPERVIOUS BACKFILL

12" Min. 12" Min.

ORIGINAL GROUND SURFACE

HDPE PIPE

8" SOLID

NO SCALE

AND SEED

6" TOPSOIL

BACKFILL

RANDOM

SAND BEDDING

MIN. 6" FILTER

EXCAVATION

TRENCH

DETAIL J - REPLACEMENT RELIEF WELL OUTFALLS

(SEE NOTE 1)

REPOSE

ANGLE OF

(EXCEPT RW-66B AND RW-67R)

V A

R

IE

S D

E P

T H

NOT TO SCALE

AGGREGATE

COARSE

12" 12" 12"12"

MIN. 12"

FILTER SAND

6 - 8 FEET, FIELD VERIFY

APPROXIMATE DISTANCE

POWER POLE

DEPTH UNKNOWN

12"

TO PROTECT POWER POLES

TEMPORARY SHORING OR BRACING

PROJECTED EXCAVATION

24" - IMPERVIOUS BACKFILL

6" TOPSOIL

(STATIONS 3+20 TO 3+30)

TRENCH EXCAVATION DETAIL FOR RW COLLECTOR PIPE NEAR POWERPOLE

NOTE 1

REPOSE SEE

ANGLE OF

AND EXTENTS.

PROFILES PIPE TYPES

15" SOLID HDPE (SEE

15"

12" FILTER SAND BEDDING

(SEE NOTE 2)

12" COARSE AGGREGATE BEDDING

FILTER SAND

12" IMPERVIOUS FILL

6" TOPSOIL

CHANNEL

TOP OF EXISTING

EXTENSION

24" RCP

OUTFALL

NEW 18" HDPE

DEPTH VARIES

TOP OF EXISTING CHANNEL

EXISTING 6" FINE AGGREGATE

INTERMITTENT ANCHORING, DEPTH VARIES

EXISTING 3" GRAVEL

REMOVED IN EXCAVATION AREAS

FILLED WITH GRAVEL - TO BE

EXISTING 3" GEOSYNTHETIC MAT

EXISTING GRAVEL

EXISTING FINE AGGREGATE

SEE NOTE 6

STABILIZATION RIPRAP

SEE NOTE 7

FILTER SAND BEDDING

DEPTH VARIES

NOT TO SCALE

FILTER SAND

6" TOPSOIL

EXISTING GROUND

12"12"

DEPTH VARIES

8"

6" FILTER SAND BEDDING

FILL DETAIL - RELIEF WELL RW-66B HDPE OUTFALL EXTENSION

12" - IMPERVIOUS FILL (SEE NOTE 5)

SOLID HDPE PIPE

NOT TO SCALE

FILTER SAND

6" TOPSOIL

(STATIONS 7+20 TO 8+15)

SEE NOTE 1.

REPOSE

ANGLE OF

EXISTING GROUND

18" 24"24"

6" FILTER SAND BEDDING

12" - IMPERVIOUS BACKFILL (SEE NOTE 5)

DEPTH VARIES

EXCAVATION AND BACKFILL DETAIL - 18" HDPE COLLECTOR PIPE

SOLID HDPE PIPE

SEE NOTE 1

REPOSE

ANGLE OF

24" CMP

MIN 12" COVER

IMPERVIOUS FILL

2'2'

6" TOPSOIL AND SEEDING

6" FILTER SAND BEDDING

EXISTING GRADE

CROSSING STATION 21+05

RELIEF WELL COLLECTOR PIPE

C-505

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IP

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NO SCALE

TYPICAL CROSS SECTION - RELIEF WELL CHANNEL FILL DETAIL

NO SCALE

(STATIONS 20+70 TO 21+08)

DETAIL A - CULVERT "A" 24" CMP EXTENSION

EXCAVATION. REMOVAL EXTENTS OF GEOSNYTHETIC MAT MUST BE LIMITED TO THE EXTENT REQUIRED FOR OUTFALL INSTALLATION.

7. FOR 24-INCH RCP EXTENSION AND RELIEF WELL COLLECTOR PIPE, THE EXISTING GEOSYNTHETIC MAT ON THE SLOPE OF THE RELIEF WELL CHANNEL MUST BE REMOVED PRIOR TO

GEOSYNTHETIC MAT. SEE SHEET FIO-12 FOR ADDITIONAL INFORMATION.

6. CONTRACTOR MAY ENCOUNTER STABILIZATION RIPRAP FROM PREVIOUS CONTRACT IN BOTTOM AND WEST SLOPE OF RELIEF WELL CHANNEL BENEATH THE GRAVEL-FILLED

5. IMPERVIOUS BACKFILL TRANSITIONS FROM 24 INCHES THICK AT STATION 6+89 TO 12 INCHES THICK AT STATION 7+39.

STATIONS 7+20 AND 7+21.

4. COARSE AGGREGATE BACKFILL SURROUNDING THE SLOTTED HDPE ON THIS DETAIL SHALL EXTEND LATERALLY 1 FOOT PAST THE SLOTTED PIPE TO SOLID HDPE TRANSITION BETWEEN

02 82 00, TITLED ASBESTOS-CONTAINING MATERIAL FOR DISPOSAL REQUIREMENTS.

3. THE EXISTING 8", 12" AND 15" PERFORATED CMP, RISERS 1, 2, 3, AND 4 ALONG WITH RELIEF WELL OUTFALLS HAVE ASBESTOS TREATED BITUMINOUS COATED PIPE. SEE SPECIFICATION

PURPOSES AS LONG AS MINIMUM THICKNESS REQUIREMENTS FOR COARSE AGGREGATE AND FILTER SAND ARE MAINTAINED.

2. COARSE AGGREGATE LIMITS SHOWN ON THIS SHEET DEPICT MINIMUM LAYER THICKNESS. CONTRACTOR MAY INCREASE LAYER THICKNESS AS NECESSARY FOR CONSTRUCTIBILITY

VERTICAL EXCAVATION AND TRENCH BOXES AND/OR OTHER MEANS OR METHODS MAY BE USED, SUBJECT TO APPROVAL OF THE SHORING PLAN SUBMITTAL AND THE COR.

1. THE EXCAVATION AND SLOPES SHOWN ON THIS SHEET ARE FOR VISUAL REFERENCE ONLY. ALL EXCAVATIONS MUST MEET ALL FEDERAL AND OSHA REQUIREMENTS FOR EXCAVATION.

NOTES:

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