015_508-D-60025_Amendment_0007_0007.pdf
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- Solicitation number
- 140R2021R0004
About this file
This document is an amendment to specifications for a federal construction contract. It provides details for Phase I of safety modifications to the BF Sisk Dam, including excavating shear keys and stability berms, and modifying the spillway. The work addresses issues with the dam's select foundation materials and will help prevent destabilization, reduce safety concerns, and ensure water deliveries. The contract is solicited by the Bureau of Reclamation within the Department of the Interior. Deliverables include excavating shear keys and berms per the amendment's specifications, treating bedrock and earth foundations, removing existing structures, and establishing controls to monitor progress.
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Text version
3624 3625
3635 3634
3642 3643 3644
365236533654
3659 3660 3661
500500
525525
550550
E. 6,395,800
N . 1
,8
,1
E. 6,396,300
N . 1
,8
,3
E. 6,397,000
N . 1
,8
,5
30+0035+0040+0045+0050+00
DH-18-101
DH-18-102
PTP-40-1
PTP-40-3
Weir27+40
GW-9
SI-37
Excavation Control Point Table
Point #
Northing
1840077.1
1839922.3
1839434.1
1839317.9
1839161.5
1838955.5
1838804.5
1838688.8
1838642.8
1838586.7
1838527.1
1838625.8
1838795.4
1839078.2
1839230.9
1839386.0
1839803.1
1839965.9
1840096.0
1839934.9
1839449.9
1839337.2
1839250.0
1839210.2
1838957.7
1838810.8
1838685.5
1838630.5
1838568.1
1838520.7
1838794.3
1839044.9
1839219.3
1839377.3
1839766.6
1839960.8
1840119.3
1840049.5
1839985.0
1839491.7
1839182.5
1838557.1
1838571.0
1838645.9
Easting
6396165.1
6396270.9
6396503.5
6396618.6
6396686.6
6396729.8
6396724.7
6396718.2
6396644.6
6396596.9
6396553.4
6396536.7
6396520.3
6396490.3
6396430.0
6396359.9
6396140.4
6396051.7
6396168.0
6396289.4
6396521.2
6396638.9
6396674.7
6396692.0
6396755.6
6396737.0
6396730.6
6396658.5
6396601.4
6396539.5
6396508.1
6396458.2
6396400.5
6396339.6
6396136.1
6396038.3
6396149.4
6396029.8
6395966.1
6396145.6
6396258.2
6396487.0
6396633.8
6396709.3
Elevation
462.0
450.8
426.6
401.0
395.9
408.7
436.6
457.0
457.7
458.5
460.8
452.6
435.9
400.8
404.9
415.6
442.2
460.9
474.8
465.7
442.1
419.7
414.7
413.5
425.9
443.4
465.5
470.0
468.6
469.9
444.1
428.0
426.0
430.4
455.0
470.5
472.4
476.3
479.7
479.7
479.7
479.9
472.3
473.6
EL
EV
A
TI
O N
Excavation depth varies, see Note 5
A
LW
A
YS
T H
IN
K
S A
FE
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SHEET
D
C
B
A
D
C
B
A
B U
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EA
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F R
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LA
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U .S
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A R
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EN
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TH
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IN
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LAR M TA IOCE N
C A D
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A ut oC A D
4.
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F
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A M
E
5- D
-6
-R
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.D W
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LA
S T
S A V
ED
D A
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-1 0-
LA
S T
S A V
ED
B Y
C S
TR
IC
K
LA
N D
C
EN
TR
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V A
LL
EY
P
R O
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C T
W
ES
T S A N
J O
A Q
U
IN
D
IV
IS
IO
N
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F.
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IS
K D
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S O
D M
O D
IF
IC
A
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S
PH
A S E
I S W
SW36 SHEAR KEY
EXCAVATION
PLAN AND SECTION
DENVER, CO 2021-05-28
NOTES
1. All dimensions are in feet unless otherwise noted.
2. For survey information, see (805-208-60101).
3. Contour interval is 5 feet.
4. Existing ground surface shall be cleared, grubbed, and stripped below all portions of the berm and shear key.
5. Depth of excavation may differ from that shown on drawings. Refer to the specifications.
6. See specifications and (60134) for bedrock surface treatment requirements.
7. Existing toe drain and outfall not shown. Toe drain to be abandoned between Sta. 31+00 and Sta. 47+00 as shown on (60084). Remove existing weirs, vaults, outfall pipes and appurtenant structures downstream of existing dam. Dispose of unless otherwise directed by COR. Grout existing toe drain pipes in accordance with specifications.
8. Remove existing rock blanket within footprint of shear key and berm construction.
9. Dewatering/unwatering not shown. See (60024).
10. See specification for treatment of soil foundation prior to placing fill.
11. Asphalt roadway to be removed. Refer to (60127) for limits of asphalt removal.
12. See (60024) and (60078) for temporary inclinometers locations.
13. Shear key excavation limits apply. Refer to specifications.
℄ Dam crest
See Note 11
See Note 7
Existing ground surface
See Note 6
60025 Horizontal Scale
LEGEND
Existing inclinometer
Existing piezometer
Existing weir
Observation well
Excavation control point
Aquatic resource area
Drainage/ditch
Existing access road
Existing ground contours
Excavated surface contours
See Note 4
Limits of rock blanket removal, see Note 8
Vertical Scale (5x Exaggeration)
0 100' 200'
0 100' 200' 0 20' 40'10'
See Note 4
Bench
Toe of dam after rock blanket removal
REFERENCE DRAWINGS
Survey Control and Alignment_ _ _ _ _ _ _ _ _ _ _805-208-60101 Site Use and Topography (3 of 4)_ _ _ _ _ _ 805-D-60019 SW36 Dewatering and Monitoring Plan, Section and Details _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 805-D-60024 SW36 Shear Key Excavation Sections_ _ _ _ _ _ _ _ 805-D-60026 Inclinometers_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 805-D-60078 Instrumentation Abandonment (1 of 2) _ _ _ _ _ _ _ 805-D-60082 Instrumentation Abandonment (2 of 2) _ _ _ _ _ _ _ 805-D-60083 SW36 Toe Drain Abandonment Plan_ _ _ _ _ _ _ _ _ 805-D-60084 Dam Crest Access Road Plan, Profile and Section_ _ 805-D-60127 Foundation Treatment_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 805-D-60134
*Points also define top of Zone 10
See Note 5
Earth foundation, see Note 10
Earth foundation, see Note 10
See Note 7 Slope variesSlope varies
1.5:1
1.
5:
2:
1.5:1
1.
5:
-1 0-
D
A dd ed a qu at ic r es ou rc e ar ea s.
U pd at ed el ev at io n fo r ex ca va tio n co nt ro l p oi nt s sh ow n in th e ta bl e.
Re le as ed
Specifications No. 20-C0909 Amendment No. 0007
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