HomeMy WebLinkAbout12/02/1997, C6 - WATER TRANSMISSION MAIN REPLACEMENT, CALIFORNIA BLVD. TO RESERVOIR 2, SPECIFICATION NO. 96-35B council lVecember2, 1997
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CITY O F SAN LUIS O B I S P O
FROM: Michael D. McCluskey,Public Works Director
Prepared by: Bridget Fraser,Engineering Assistant
SUBJECT:
Water Transmission Main Replacement,California Blvd.to Reservoir 2, SpecificationNo.96-35B
CAO RECOMMENDATION:
1. Approve plans and specifications for the Water Transmission Main Replacement, California
Blvd.to Reservoir No. 2, SpecificationNo. 96-35.
2. Appropriate $429,000 from available water fund working capital to amend the project budget
from $3,371,000 to $3,800,000.
3. Authorize staff to advertise for bids.
4. Authorize the CAO to award the construction contract if the accepted bid plus contingencies is
within the available budget.
DISCUSSION:
The existing transmission main is a welded steel pipe,over 40 years old,with some portions installed
as early as 1942. It is one of two transmission mains from the City's Water Treatment Plant and
serves the upper water zones of the City and Cal Poly. The line has been scheduled for replacement
due to the increasing number of leaks and repairs. In July of 1996, the City hired Montgomery
Watson Americas, Inc., of Walnut Creek to provide plans and specifications for this project. The
plans include installationof a new 600mm(24')transmissionmain starting at ReservoirNo. 2. It then
follows Stenner Creek Road for approximately 2300 meters (1.5 miles) to a point adjacent to the
City's transfer pump station. From there, it is routed another 2900 meters (1.8 miles) through Cal
Poly property and down California Blvd. to a point just north of Hathaway. The plans also include
installation of a fiber optics conduit from the Water Treatment Plant entrance to the end of the new
pipeline on California Blvd.
Staff recommends the appropriation of$429,00 from water fund available working capital to amend
the project budget from $3,371,000 to $3,800,000. The original project budget was based on a
reconnaissance level review of the project. Detailed information and analysis during the design stage
provided more information about the cost of building through the difficult construction corridor of
Stenner Creek Road - from the City's water treatment plant to the 7.5 million gallon Reservoir#2.
Additionally,the original budget preparation for this project did not include the installation of a fiber
optic conduit,which accounts for over$75,000 of the needed additional funds. Finally,some changes
to the project alignment and scope occurred during preliminary engineering performed by the City's
consultant,Montgomery Watson.
CONCURRENCES:
• Community Development Department has determined that this project will not cause significant
harm to the environment and has filed a mitigated negative declaration of environmental impact.
• Cal Poly has granted the City a temporary permit for construction of the pipeline that passes
Council Agenda Report- Water Transmission Main Project: Calif. Blvd. To Reservoir No. 2
Page 2
through their property. After installation of the pipeline has been completed, a final easement
will be drawn up based on the actual installed location.
• This project is subject to approval by the U.S. Army Corps Engineers, California Regional
Water Quality Control Board and the State Department of Fish & Game. A permit has been
received from Fish & Game, however permits are still pending from the other two agencies.
Work may not begin until the permits have been received.
FISCAL IMPACT:
A total of$3,371,000 was approved as part of the 1995-97 and 1997-98 Capital Improvement Plans
to support the construction phase of the transmission main replacement (1995-97 Financial Plan,
Appendix B, p.44 and 1997-99 Financial Plan, Appendix B, pp.51-52). The Engineer's estimate
(see detail below) is $3,800,000. It is recommended that Council appropriate $429,000 from
available working capital to amend the project budget to $3,800,000.
Based on actual financial results in the water fund for 1996-97 and projected revenues and
expenditures for 1997-98, adequate balances are available to fund this project and maintain working
capital at above policy levels.
The estimated project costs are as follows:
Engineer's Estimate: $ 3,555,161
Contingencies @ 5.5%: $ 194,839
Construction Administration: 50.000
Total Estimate of Costs: $3,800,000
The bid documents have been set up to include alternate piping materials. The base bid includes the
use of welded steel pipe which is the material recommended by the City's consultant. An alternate bid
item is included that would allow some or all of the pipeline to be installed using ductile iron pipe.
This will allow substantiallymore flexibility in meeting the project goals and budgetary constraints.
ALTERNATIVES:
Deny the project. This is not recommended due to the age of the pipeline and its importance to the
water delivery system.
Defer the project. Deferring the project is not recommended as nearly two years of planning and
design work have been completed and the project is ready to begin construction in the spring. The
construction time frame has been carefully structured with other involved agencies.
Defer other water projects. Deferring other planned capital projects is not recommended at this
time,as it may not be necessary and will result in added costs,as staff resources have been expended
to bring them to their current stage of engineering and design.
Plans and Specifications are available for review in the Council Office.