HomeMy WebLinkAboutItem 29 - ValveMEMO TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL
FROM: BRUNO RUMBELOW, CITY MANAGER
MEETING DATE: NOVEMBER 7, 2023
SUBJECT: RATIFICATION OF RAW WATER VAULT VALVE PURCHASE
RECOMMENDATION: City Council to consider the ratification of the emergency purchase of a
valve for the raw water vault from Rangeline Utility Services LLC.
FUNDING SOURCE: Funds are available in the Utility Enterprise Fund in the estimated amount
of $100,000.
BACKGROUND: This ratification authorizes the installation of two, 30" valves on piping
within our raw water vault supply located on the downstream side of the
dam. This includes the purchase of a new 30" valve and the installation of
a second 30" valve that the City has in the warehouse.
The raw water vault is the diversion structure used to convey water
released from the lake to the raw water pump station that feeds untreated
water to the Water Treatment Plant. There is currently one valve that
cannot be operated and is in need of replacing. These valves will allow for
better control of the intake flows to the raw water pump station. The valve
being ordered has a 16-week lead-time. Early next year the US Corps of
Engineers has repairs planned to the downstream stilling basin and our
valves will be replaced at the same time since the Corps will temporarily
shut off all water being released from the dam structure.
Rangeline Utility Services LLC is the only contractor that provided a
responsive bid to this project and had the required welders to complete
this work. The proposed work is estimated to be $95,472 and rounded to
$100,000 for additional contingencies that may be discovered as the work
commences.
Staff recommends approval.
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REPLACE E NG V VAULT CONCRETE TOP
SLAB AND IN L CO HATCH. MINIMUM 8"
THICK SLAB, 4, SI CONCRETE, WITH #6 AT
12" O.C. APP B SIZE IS 6.5'X10.75'
SEE INSET V B
W 30" W i
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STING 79" nPFN TnP
DENTOtA CREEK
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REMOVE EXISTING 30" GATE VALVE AND INSTALL I \I NEW 30" BUTTERFLY VALVE AND MECHANICAL 1�� , •
ACTUATOR INSIDE EXISTING VAULT (E) _
TOP OF PIPE ELEVATION APPROXIMATELY 476.0 0
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/30 -GROUND ELEVATION APPROXIMATELY 495.25 X
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I / SEE INSET VIEW A
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\ INSTALL NEW 30 BUTTERFLY = /
- \ VALVE WITH MECHANICAL
ACTUATOR INSIDE VAULT (S)
\ \ SEE INSET VIEW A I ,
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GRAPHIC SCALE IN FEET
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ON 11 "X17" SHEET, SCALE IS 1 "=20"
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EXISTING GOLF COURSE
IRRIGATION PUMP STATION
TO BE UPGRADED IN FUTURE
12" WL
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Replace existing
gate valve
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Inset View A:
Tee location inside vault showing the
valve to be replaced and the location
of the new valve to be installed
Inset View B:
Location of valve vault concrete slab
to be replaced and Bilco hatch to be
installed.
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