Amendment 0007_THA-HV-129 E-501.pdf
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- Solicitation number
- W912WJ22B0014
About this file
This solicitation package includes plans and specifications for upgrades to electrical systems and installation of a new standby generator at the Hodges Village Dam in Oxford, Massachusetts. The major work components involve installing a new diesel generator; coordinating an underground utility service connection with the local power company; constructing concrete duct banks, vaults, and equipment pads; and performing selective upgrades to existing electrical equipment to comply with safety standards. The solicitation was issued by the U.S. Army Corps of Engineers New England District for a fixed-price construction contract. The closing date for proposals is not specified in the documents provided.
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Text version
12"
A7 SCALE: N.T.S
CONSTRUCTION DETAIL
NOTES:
3"
3" 2" 3"
MIN.
2"
MAX.
30"
12"
FINISHED GRADE
24"
SEE NOTE #2
SEE NOTE #1
ELECTRICAL DUCT. REFER TO
IDENTIFICATIONS SCHEDULE
AND DUCT BANK SECTIONS
FOR SIZE AND QUANTITY
CONDUIT SPACERS, 5'-0" ON
CENTER. SPACERS SHALL BE
INTERLOCKED HORIZONTALLY
ONLY. SPACERS SHALL BE
STAGGERED VERTICALLY
6" PLASTIC WARNING TAPE.
SEE NOTE #3
1. BACKFILL DUCT BANK WITH SELECT MATERIAL. BACKFILL IN LAYERS.
2. SAND BACKFILL. WHEN PLACING SAND POUR SLOWLY AND DISTRIBUTE IT CAREFULLY SO AS NOT TO
DISLODGE THE SPACERS.
3. PLASTIC WARNING TAPE SHALL BE "EXTRA STRETCH," 6" WIDE. COLOR CODE SHALL BE AS FOLLOWS:
RED-ELECTRIC, ORANGE-COMMUNICATIONS. IMPRINTED TEXT SHALL IDENTIFY DUCTBANK SERVICE.
UTILIZE NON-DETECTABLE TAPE FOR ELECTRIC DUCTS AND METALLIZED DETECTABLE TAPE FOR
COMMUNICATION DUCTS.
4. PROVIDE 6 INCHES OF TOPSOIL TO GRADE AND SEED ABOVE THE BACKFILL.
SEE NOTE 4
NOTES:NOTES:
1. REFER TO DETAIL D7 "TYPICAL REINFORCED CONCRETE
DUCTBANK CONSTRUCTION DETAIL" FOR ADDITIONAL
INFORMATION.
2. REFER TO SHEET E-601 "ELECTRICAL PROPOSED ONELINE
DIAGRAM" FOR CONDUCTOR REQUIREMENTS.
3. PROVIDE 12INCH MINIMUM SPACING BETWEEN PRIMARY AND
COMMUNICATIONS DUCTBANKS (FACE OF CONCRETE) IN
ACCORDANCE WITH UTILITY COMPANY REQUIREMENTS.
1 4" SCHEDULE 40 PVC - ACTIVE
CONDUIT IDENTIFICATION SCHEDULE
D5 SCALE: N.T.S
REINFORCED CONCRETE DUCTBANK SECTIONS
#4 REBAR AT 18" O.C. IN PAIRS (TYP.)
FINISH GRADE
NOTES:
SEE NOTE 3
(MIN.)
3"
(MIN.)
7 1/2"
3" (MIN.) 7 1/2" (MIN.)
30"
(MAX.)
3"
(MIN.)
12"
(MIN.)
CL
LC
LC
24"
(MIN.)
D7 SCALE: N.T.S
6" PLASTIC WARNING TAPE
HOLD DOWN BAR. ANGLE IRON WITH
0.5" DIA (APPROX.) HOLES
CONDUIT SPACERS, 5'-0" ON CENTER. SPACERS
SHALL BE INTERLOCKED HORIZONTALLY ONLY.
SPACERS SHALL BE STAGGERED VERTICALLY
CONTINUOUS #5 REBAR AT 7 1/2"
TOP, BOTTOM & SIDES. SEE NOTE 2
ELECTRICAL DUCT. REFER TO SPECIFICATIONS
FOR TYPE AND DUCT BANK SECTIONS AND
SCHEDULES FOR SIZE
GROUND CONDUCTOR. REFER TO BUILDING
GROUNDING ELECTRODE SYSTEM DETAIL.
SEE NOTE 9
NO. 3, DRIVEN AT 15°
ANGLE. SEE NOTE 5
1. REFER TO DUCTBANK TRENCH DETAIL D4 ON SHEET C-501.
2. DUCT BANK SHALL BE ENCASED IN CONCRETE WITH A LEAST THREE INCHES OF CONCRETE AT THE TOP, BOTTOM AND SIDES. THIS IS A TYPICAL EXAMPLE OF DUCT BANK CONSTRUCTION. FOR ADDITIONAL COLUMN
AND/OR ROW OF CONDUIT PROVIDE AN ADDITIONAL #5 REBAR SPACED AS NOTED ABOVE.
3. THE CONCRETE SHALL INCORPORATE 3/8" AGGREGATE WITH A NOMINAL COMPRESSIVE STRENGTH OF 2,500 LBS. PER SQUARE INCH. THE SLUMP SHALL BE AT THE UPPER END OF THE RANGE, PREFERABLY 7 TO 8 INCHES. IT SHOULD HAVE JUST ENOUGH SLUMP TO FLOW TO THE BOTTOM OF THE DUCT BANK AND YET NOT BE SO WET AS TO CAUSE THE CONDUITS TO FLOAT EXCESSIVELY. COORDINATE EXACT REQUIREMENTS WITH
CIVIL ENGINEER.
4. WHEN PLACING CONCRETE AROUND CONDUITS ADJUST THE DELIVERY CHUTE SO THE FALL OF THE CONCRETE INTO THE TRENCH IS MINIMAL. POUR THE CONCRETE SLOWLY AND DISTRIBUTE IT EVENLY SO AS NOT TO
DISLODGE THE SPACERS.
5. THE REBAR STAKES AND HOLD DOWN BARS ARE REQUIRED TO PREVENT THE FLOTATION OF THE DUCT BANK.
FLOTATION IS CAUSED BY DUCT BUOYANCY AND CHURNING OF THE CONCRETE DURING THE POUR. FOUR SETS OF REBAR STAKES AND HOLD DOWN BARS SHOULD BE USED PER 20 FEET OF DUCT BANK. THE 3" EXTENSION
OF THE REBAR ABOVE THE DUCTS IS TO BE USED AS A CONCRETE GAUGE.
6. STEEL REINFORCING RODS SHALL BE INTERFACED WITH BUILDING FOUNDATION AND MANHOLE WALLS TO
MINIMIZE SHEARING.
7. CONCRETE CONSTRUCTION JOINTS SHALL NOT BE SPACED LESS THAN 40 FEET O.C.
8. REQUIRED FOR SERVICE ENTRANCE DUCTBANK ONLY. REFER TO DETAIL A3 ON SHEET E-502.
TYPICAL REINFORCED CONCRETE DUCTBANK
CONSTRUCTION DETAIL
NOTES:NOTES:
1. REFER TO DETAIL A7 "TYPICAL DIRECT BURIED DUCTBANK
CONSTRUCTION DETAIL" FOR ADDITIONAL INFORMATION.
2. REFER TO SHEET E-601 "ELECTRICAL PROPOSED ONELINE
DIAGRAM" FOR CONDUCTOR REQUIREMENTS.
4" SCHEDULE 40 PVC - ACTIVE
4" SCHEDULE 40 PVC - SPARE WITH PULL
STRING
CONDUIT IDENTIFICATION SCHEDULE
B5 SCALE: N.T.S
DIRECT BURIED DUCTBANK SECTIONS
SECTION DB-DB
SECTION DA-DA
2 2
SECTION CA-CA
3 2" SCHEDULE 40 PVC - GENERATOR
CONTROLS
3 3
4 2-1/2" SCHEDULE 40 PVC - ACTIVE
5 2-1/2" SCHEDULE 40 PVC - SPARE
WITH PULL STRING
2 4" SCHEDULE 40 PVC - SPARE
WITH PULLSTRING
TYPICAL DIRECT BURIED DUCTBANK
4" SCHEDULE 40 PVC - COMMUNICATION
SECTION CB-CB
SEE NOTE 3
SECTION CC-CC
12" (MIN.)
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