HomeMy WebLinkAbout06/06/2006, C8 - PREFUMO CREEK SILT REMOVAL, SPECIFICATION NO. 90581 council. '�°�� June 6, 2006
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CITY O F SAN LUIS O B I S P O
FROM: Jay D. Walter,Public Works Direct !�
Prepared by: Daniel Van Beveren, for Civil Engineef�
SUBJECT: PREFUMO CREEK SILT REMOVAL, SPECIFICATION NO. 90581
CAO RECOMMENDATION:
1. Approve plans and specifications for "PREFUMO CREEK SILT REMOVAL,
SPECIFICATION NO. 90581".
2. Authorize staff to advertise for bids.
3. Authorize the CAO to award the construction contract if the lowest acceptable bid is within
the engineer's estimate of$60,000.
DISCUSSION
The portion of Prefumo Creek between Los Osos Valley Road and Laguna Lake is a location where
the creek slope flattens, flow velocity decreases, and sedimentation accumulates as the water in the
creek slows down prior to entering Laguna Lake. Sedimentation is removed from this location
every few years in order to maintain the capacity of.the creek channel and to help prevent the
accumulated sediment from migrating into the lake. This sediment removal work was last done in
2002.
Currently there exists approximately the same amount of sediment in this location as existed prior
to the 2002 sediment removal project. If this work is not periodically carried out, sedimentation
will continue to accumulate and result in the decreased capacity of the creek channel and an
increase in the rate at which Laguna Lake is currently being filled with sediment.
The sediment material removed is granular;containing-a large amount of gravel and sand; and
has been found to be a useful as a structural fill material. After removing the sediment from the
project site, the contractor will transport the material to another location where it can be of
beneficial use.
CONCURRENCES
This project has received a Mitigated Negative Declaration and a grading permit from the City's
Community Development Department, a Water Quality Certification from the Regional Water
Quality Control Board, as well as a permit from the Army Corps of Engineers. Covered under the
jurisdiction of the Army Corps of Engineers' permit are supporting statements from both the
National Marine Fisheries and Fish and Wildlife Services. The project plans as proposed for
approval are consistent with the "requirements of the City's Mitigated Negative Declaration and
the terms of the various permits received:
N
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Council Agenda Report—Prefumo Creek Silt Removal,Spec.#90581
Page 2
This project is subject to approval by the State Department of Fish and Game. A permit has been
applied for and is still pending. Work will not begin on this project until the permit has been
received.
FISCAL IMPACT
Prefumo Creek Silt Removal is identified in the 2005-07 Financial Plan.
Total Project Budget $80,000
Project Costs to Date (survey work) -$10,550
Remaining Project Budget $69,450
Construction Costs
Engineer's Estimate: 60,000
10% Contingencies: +6,000
Total for Construction: $66,000
Miscellaneous project costs (printing, mailing, etc.) +3,000
Total: $69,000
Current Balance in Project Account: $69,450
ATTACHMENTS:
1. Project Location Map
AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE
1. Project Special Provisions
2. Initial Study/Notice of Determination
i:Lcar repons120061d;1\90581 prefumo creek sift remova*0581•adv.doc
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ATTACHMENT #1
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C of PREFUMO CREEK SILT REMOVAL
San lu,S omeapo PROJECT LOCATION MAP
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