TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Frank Lucido, Engineering Manager
SUBJECT: Approval of Plans and Specifications, Authorization to Advertise for Bids for the “Redwood Road 5.76 Slide Repair Project”, RDS 21-05
RECOMMENDATION
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Approve the Plans and Specifications for the “Redwood Road 5.76 Slide Repair Project,” and authorization to advertise for sealed bids, and opening of the bids at a time, date, and location to be published by the Director of Public Works pursuant to Section 20150.8 of the Public Contract Code. (No Fiscal impact)
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BACKGROUND
Heavy rains in February of 2017 oversaturated a portion of Redwood Road near mile post marker (MPM) 5.76 which serves a small number of residents, causing a slide into Redwood Creek and roadway distress for a distance of about 60 feet directly above the slide and another 80 feet of adjacent to the slide area. On January 5, 2022, the board approved $555,746 from Measure T funds to start the investigation and design process for the project. Two alternatives were considered for this project. The most expensive alternative has an estimated project cost of $1,800,000 and involves drilling deep into competent material, casting concrete piers and constructing a concrete roadway over the piers. While this option allows for a slightly wider roadway and can be constructed over an area that slid it is not recommended for not being the best value. The roadway narrows in many places in the vicinity of the repair and having a localized area that is wider provides little advantage to passing traffic and since the are hasn’t slid yet, there isn’t a need to implement this more expensive option. The selected option has an estimated project cost of $815,000 and also involves drilling into competent material and casting a wall of concrete piers. These piers will be tightly spaced to secure soil in the roadway and take advantage of the fact that the roadway hasn’t slid. Because the majority of the work for this recommended option is on the roadway it also has less impact to the creek bank and environment.
The Plans and Specifications are complete and ready for approval by the Board of Supervisors. The Director is requesting authorization to advertise for bids. Staff will return to the Board of Supervisors at the time of construction to present a detailed project budget based on the lowest responsible bid and to request a budget amendment to fund construction.
Requested Actions:
Approve Plans and Specifications for the “Redwood Road 5.76 Slide Repair Project”, RDS 21-05 and authorize to advertise for sealed bids.
FISCAL
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Is there a Fiscal Impact? |
No |
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Is it Mandatory or Discretionary? |
Discretionary |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: Consideration and possible adoption of a Categorical Exemption Class 1: It has been determined that this type of project does not have a significant effect on the environment and is exempt from the California Environmental Quality Act. [See Class 1 (“Existing Facilities”) which may be found in the guidelines for the implementation of the California Environmental Quality Act of 14 CCR §15301; see also Napa County’s Local Procedures for Implementing the California Environmental Quality Act, Appendix B.]