HomeMy WebLinkAbout05-15-2018 Item 08 - Osos Leff Santa Barbara swerline replacemnt project - Spec no 91438Meeting Date: 5/15/2018
FROM: Daryl R. Grigsby, Director of Public Works
Prepared By: Hai Nguyen, Engineer II
SUBJECT: OSOS/LEFF/SANTA BARBARA SEWERLINE REPLACEMENT PROJECT
SPECIFICATION NO. 91438
RECOMMENDATION
1.Approve plans and specifications for the Osos/Leff/Santa Barbara Sewerline Project,
Specification Number 91438 (Attachments “b” and “c”); and
2.Authorize staff to advertise for bids; and
3.Authorize the City Manager to award the construction contract if the lowest responsible bid
is within the Engineer’s Estimate of $950,000.
DISCUSSION
Background
Replacement of wastewater collection pipes is part of an ongoing program to replace aging,
deteriorating, or deficient sewer infrastructure. This program has several objectives, inc luding,
provide uninterrupted sewage flow, eliminate potential health hazards and/or effluent leakage,
reduce the need for emergency repairs and reduce maintenance requirements. Furthermore,
repairing defective components of sanitary sewer collection systems will reduce the
infiltration/inflo w of groundwater and surface runoff into the sanitary sewer system thereby
reducing operational costs.
Project
This project will replace approximately 700 linear feet of sewer main by open trenching on Santa
Barbara and Osos. The project also includes installation of 1,750 feet of sewer main by pipe
bursting on Leff, Church and Osos Streets. See Attachment “a” for a vicinity map of the project.
The pipe bursting method installs a new sewer main inside the existing sewer main resulting in a
new sewer main that is equal to or greater than the prior sewer main size. Replacing these sewer
mains will result in lower costs to the City and reduced customer impacts associated with
emergency repairs.
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ENVIRONMENTAL REVIEW
This project is categorically exempt from environmental review pursuant to section 15301 of the
CEQA Guidelines (Existing Facilities) since it is a maintenance and replacement project. A
Notice of Exemption has been filed through the Community Development Department.
FISCAL IMPACT
Sewerline improvements identified in this project are included in the 2017 -19 Financial Plan
page E2-142 for the Waste Collection System Improvements master account. The 2017 -2019
Financial Plan allocated $780,000 for this project.
Funding is available in the Wastewater Collection System Master Account (90239), which has a
current balance of $2,735,495. Of the current balance, a total of $1,015,937 is available to
support this request (this amount includes the $780,000 specifically allocated in the 2017-2019
Financial Plan). Additional funding of $134,563 will be taken from completed projects to meet
the total project budget. There are future proposed Wastewater Collection projects which are
slated for the Master Account balance.
All utility improvement projects are classified as high-risk due to many unknown subsurface
conditions. Previous sewerline replacement projects indicate that higher contingencies (20%-
25%) are required to cover the additional cost of modifying unknown utility conflicts and
hazardous excavation encountered during construction. Staff identified 20% contingencies for
this project which is not included in the Engineer’s Estimate.
Wastewater Collection
Engineer's Estimate:$950,000
Contingencies (20%):$190,000
Material Testing:$10,000
Printing:$500
Total for Project:$1,150,500
Total account balance $2,735,495
Total account funding
available for project $1,015,937
Remaining Balance $1,719,558
Osos/Leff/Santa Barbara Sewerline Replacement
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ALTERNATIVES
Deny or defer approval to advertise. The City Council may choose to deny or defer the approval
to advertise this project. Staff does not recommend this option, as the sewer main will continue
to deteriorate and pose a high risk of catastrophic failure, resultant in sewer overflows, water
quality violations, and potential fines.
Attachments:
a – Vicinity Map
b - Council Reading File - 91438 Plans
c - Council Reading File - 91438 Specifications
Attachments:
a - Vicinity Map
b - Council Reading File - 91438 Plans
c - Council Reading File - 91438 Specifications
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N
VICINITY MAP
OSOS/LEFF/SANTA BARBARA
SEWERLINE REPLACEMENT
1" = 250'
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