HomeMy WebLinkAbout10-15-2013 c4 sewer lin replacement
FROM: Daryl R. Grigsby, Director of Public Works
Prepared By: Matt Horn, Supervising Civil Engineer
SUBJECT: SEWERLINE REPLACEMENT, SPECIFICATION NO. 90916C
RECOMMENDATION
1. Reject all bids received for the Sewerline Replacement, Specification No. 90916B project.
2. Approve the plans and specifications for the Sewerline Replacement, Specification No. 90916C.
3. Authorize staff to advertise for bids and authorize the City Manager to award the contract if the
lowest responsible bid is within the Engineer’s Estimate of $850,000.
4. Approve the transfer of up to $264,600 into the construction phase of the project account at the
time of project award from the Sewer Fund Completed Projects Account and the Wastewater
Collection Master Account.
DISCUSSION
Replacement of wastewater collection pipes is part of an ongoing program to replace aging and
deteriorating infrastructure. This program has several objectives: 1) Ensure reliable removal of waste;
2) Reduce the need for emergency repairs; 3) Reduce the need for preventive maintenance; and 4)
Ensure uninterrupted wastewater flow without health hazard or effluent leakage. This project will
accomplish these objectives for part of the City’s wastewater collection system.
The scope of this project includes replacing sewerlines in portions of Beach, Islay and Chorro
Streets. The existing sewerlines are maintenance intensive and need additional capacity. Portions of
the existing sewer system will be increased in size from six and eight inch diameter pipes to eight,
ten, and 12 inch diameter pipes increasing the system’s capacity. Maintenance needs will be
reduced because of the new and larger sewerlines.
In 2011 this project was awarded to a contractor to complete all planned work. A utility conflict in
Pismo Street required the cancellation of that contract, completion of portions of the Pismo Street
work in coordination with ConocoPhillips, and re-advertisement of the remaining work. On July 2,
2013 Council authorized the re-advertisement of the remaining work. The bids received on July 25,
2013 were in excess of the estimated construction costs of $785,000. Staff recommends rejecting
all bids, revising the estimated construction costs and rebidding the project. Bidders identified
several manholes that were deeper than typically found requiring larger excavations and additional
cost.
Experience and Reference Requirements
Meeting Date
Item Number 10/15/13
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Sewerline Replacement, Specification No. 90916C Page 2
This project will require the contractor to replace these sewerlines using a predominantly trenchless
process. The two specified methods of installation are pipe bursting and pipe reaming. Using a
trenchless process will allow for a higher quality seamless pipe to be installed at a lower cost due to
the lower pipe installation cost as compared to conventional trenching.
While the trenchless installation process for sewerline replacement is advantageous in this situation,
it requires a contractor with specific experience and expertise to complete this work. A contractor
with limited trenchless pipe installation experience could damage the sewer system, cause sewage
spills, and increase public inconvenience during the installation process. For these reasons, staff is
requesting the contractors to submit references documenting the experience of the firm completing
the trenchless installation work.
CONCURRENCES
The Community Development Department has given this project a categorical exemption from
environmental review.
FISCAL IMPACT
This sewerline replacement project is originally identified in the 2009-11 Financial Plan and carried
over to the 2011-13 Financial Plan, Appendix B, on page 3-92, which identifies a $1,300,000
budget estimate for this project. Supplemental funding of up to $264,600 is requested from the
Sewer Fund Completed Projects account and the Wastewater Collection Master account, which has
an available balance of $200,000 and $570,500 respectively to support this request. Staff
recommends transferring funding from these accounts (not to exceed $264,600) to the project
account at time of contract award, based on construction bid amounts.
ATTACHMENT
Vicinity Map
Construction (Engineer's Estimate):$850,000
Construction Contingencies:$85,000
Total for Construction:$935,000
Materials Testing:$11,000
Miscellaneous (incl. printing)$500
Total for other costs:$11,500
Total Cost of Project $946,500
Project Account (90916) Available Funding:$682,100
Sewer Fund Completed Projects Account $200,000
Master WWC System Account (90239) Available Funding:$570,500
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Sewerline Replacement, Specification No. 90916C Page 3
AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE
Plans and Special Provisions
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