060_508-D-60085_Amendment_0007_0007.pdf
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- Solicitation number
- 140R2021R0004
About this file
This document is an amendment to a federal contract for the BF Sisk Safety of Dams (SOD) Modifications, Phase I project. The project scope includes construction of shear keys, stability berms, and spillway modification to address issues with select foundation materials at the BF Sisk Dam and help prevent destabilization, reduce safety concerns, and maintain water supply deliveries. The Bureau of Reclamation is the contracting agency. Work will involve grouting abandoned toe drain pipes and modifying the existing dam to improve stability. Drawings and specifications provide details on grout pipe installation, vent locations, mixture requirements, and sequencing for the grouting operations.
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SW145 EXISTING TOE
DRAIN GROUTING
SECTION, PROFILE, AND
DETAILS
DENVER, CO 2021-05-28
0 10' 20'
Existing weir boxes to be removed
Existing downstream outfall pipes to be removed to extent of excavationExisting HDPE pipe extension to be removed
Existing 8-in sewer pipe toe drain, to be grouted and abandoned
Existing drainage channel
Existing access road
Existing dam surface
GROUTING SEQUENCE
STAGE 1 GROUTING
1. Inflate Cherne Muni ball sewer plug.
2. Open all valves for grout pipes (GP) and vent pipes (VP) at the start of grouting.
3. Pump low pressure air into VP1 and monitor for blockages in all GPs and
VP2.
4. Remove blockages with low pressure water. Turn off water and air once all blockages are removed.
5. Begin grouting GP1.
6. Close VP1 when heavy grout return is observed.
7. Close GP2 when grout return is observed. Continue grouting GP1.
8. When grout return is observed from GP3, close GP1 and begin grouting
GP2.
9. When grout return is observed from VP2, close GP2 and begin grouting
GP3.
10. Stage 1 grouting is complete when heavy grout return is observed from
VP2 while grouting GP3.
STAGE 2 GROUTING
1. To begin a minimum of 10 hours after completion of Stage 1 grouting.
2. Deflate Cherne Muni ball sewer plug unless directed otherwise by the COR.
3. Seal the annulus between the 1-1/4-in schedule 80 PVC stage 2 grout pipe and 1-in PVC pipe inserted through Cherne Muni ball pass through.
4. Begin grouting 1-in PVC stage 2 grout pipe.
5. Grouting is complete when:
5.1. Further grouting would require pumping at
pressures greater than 20 psi.
5.2. Based on conditions, the COR approves
completion of grouting prior to volume and pressure limits.
GENERAL GROUTING NOTES
1. Prior to grouting operations, the toe drain outfall pipe shall be cleaned with a low pressure wash to remove any sediment in the pipe invert.
2. Stage 1 and stage 2 grouting operations must be completed in a sequence with a minimum of 10 hours between activities.
3. Each toe drain pipe (left and right) will be grouted from the downstream outfall in two stages.
4. Grout pipes and vent pipes are 1-in diameter schedule 40 PVC pipe.
5. Each PVC pipe is continuous, connected together using solvent-welded couplers.
6. Two air vent pipes (VP1 and VP2) are required in the bulkhead near the crown of the toe drain at the downstream outfall for Stage 1 grouting.
7. Vent pipes shall be equipped with vertical riser pipe on the downstream end and valves on the end of the risers. VP1 riser shall extend 1.0 above the downstream crown of the drain pipe. VP2 riser shall extend 2.5 above the downstream crown of the drain pipe.
8. Use a grout pressure of 5 to 20 psi for grouting operations as approved by
COR.
9. Grout pipes should be installed on the toe drain invert or centralized. Vent pipes should be installed as close as feasible to the toe drain crown as shown.
10. Grout soaked burlap is intended to provide backer for placement of the concrete plug and to prevent grout leaks.
11. The concrete plug is un-reinforced and placed as dry pack. The grout and vent pipes shall be thoroughly surrounded by the concrete plug.
12. Prior to grouting, install threaded brass valves with quick disconnect (cam-lock) connections, operated by lever handles for quick shutoff, into the exposed threaded ends of each grout and vent pipe. Plastic valves are not acceptable.
13. The grouting must be pressure-controlled using a grout manifold, see (40-D-7100).
14. The water/cement ratio of the grout mixture shall be 0.9:1 by volume. A grout fluidifier shall be added to the grout mix to improve flowability. Use manufacturer's recommended dosage rate.
15. The grout sequence presented may have to be modified in the field to fit field conditions. The COR may direct changes to the grout program to fit field conditions.
16. Record grout volumes from Stage 1 grouting and Stage 2 grouting for each toe drain outfall pipe (left and right) and submit to COR upon completion of grouting.
NOTES
1. All dimensions are in feet unless otherwise noted.
2. For survey information, see (805-208-60101).
3. For additional information regarding instrumentation, see (60075) and (60076).
4. Toe drains consist of left and right toe drains sections. Grout left and right toe drains sections separately. Grouting may be performed from other access points, as approved by the COR.
5. If grout is observed in toe drain sections separate from that not currently being grouted, pause grout operations and notify COR. COR will evaluate and approve further grouting operation.
2.0
GP2, 40.0
Cherne muni-ball sewer plug
2-in female pipe connection
1/4-in inflation pipe
Remove HDPE drain pipe extension prior to grouting
60085 NOT TO SCALE
VP1 VP2
GP2
GP1
2-in female pipe connection
1/4-in inflation pipe
1-1/4-in schedule 80 PVC pipe, stage 2 grout pipe
1-in dia PVC pipe inserted through stage 2 grout pipe Threaded to accommodate valves (not shown)
VP1, 1.0
VP2, 2.5
Vent pipe shall be equipped with riser pipe, see general grouting note 7
90° connection
Threaded to accommodate valves (not shown)
Dry pack concrete plug
VP1
VP2
GP3
GP2
1/4-in inflation pipe
Wrap grout and vent pipes and completely plug cross section of existing 8" dia drain with grout soaked burlap
0.5 0.5
Existing 8-in dia clay sewer pipe
60085
60085
Cherne muni-ball sewer plug
℄ 1-in dia PVC grout pipe inserted through Stage 2 grout pipe
VP1, 5.0
VP2, 77.0
Apx 82.0
GP1, 5.0
GP3, 77.0
1/4-in inflation pipe
1-1/4-in schedule 80 PVC pipe, stage 2 grout pipe
See Detail 1
Existing 8-in dia drain pipe, clay sewer pipe
See Detail 2
1.5
Adaptor from Cherne Muni-ball sewer plug to stage 2 grout pipe
1-1/4-in schedule 80 PVC pipe, stage 2 grout pipe
1-in dia PVC pipe inserted through stage 2 grout pipe
Sewer plug pass through
Existing 8-in dia clay sewer pipe
Apx location, 90-degree pipe bend
GP3
GP1
60085 NOT TO SCALE
60085 NOT TO SCALE
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Re le as ed
Specifications No. 20-C0909 Amendment No. 0007
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