Stonybrook Creek Crossings and Fish Passage Improvement Project
Palomares Road at Postmiles 8.60 and 8.75
THIS PROJECT IS NOW CLOSED FOR BID SUBMISSIONS
Download the Bid Results here:
Stonybrook Creek Bid Results 3-20-15
**Despite what may be listed on the Dodge website, the bid open date has not changed and remains, Friday March 20th at 4:00pm.**
INFORMAL BID NOTICE TO CONTRACTORS
Download the Bid Packet and Project Plans below for more information (pdf format).
Bid Packet includes the following:
- Notice to Contractors
- Special Provisions
- Appendices A (Construction Special Provisions)
- Appendices C-E
Appendix B Project Plans (Parts 1-3)
Q&A and Addendums
Bidders are NOT required to purchase plans to bid on the project.
If you would like to purchase printed copies of the bid packet you may do so for $20. We do not accept credit cards.
For questions please contact the Project Manager at the Alameda County Resource Conservation District, 3585 Greenville Road, Suite 2, Livermore, California 94550-6710, (925) 371-0154 extension 115.
Sealed proposals for the work shown on the plans entitled:
STONYBROOK CREEK CROSSINGS AND FISH PASSAGE IMPROVEMENT PROJECT
PALOMAES ROAD AT POSTMILES 8.60 AND 8.75
will be received at the office of the Alameda County Resource Conservation District (the “District”), 3585 Greenville Road, Suite 2, Livermore, California, 94550-6710, until 4:00 PM. on Friday, March 20, 2015, at which time they will be publicly opened and read at the above address.
A mandatory pre-bid meeting is scheduled on Monday, March 2, 2015 at 9:00 AM. at the staging area located on the right hand side of Palomares Road (see Drawing Number G-002 for location of staging area. It is the first pull-off to the right after turning onto Palomares Rd from Niles Canyon Road). Bids will not be considered from Contractors who were not represented at the meeting.
General Work Description:
The Stonybrook Creek Crossings and Fish Passage Improvement Project includes two culvert improvements that cross Stonybrook Creek, a tributary of Alameda Creek along the County of Alameda-maintained Palomares Road at Mile Post (MP) 8.60 and 8.75 to improve anadromous and resident fish passage. Additional work will occur within the stream on privately owned lands. The project will include a full replacement of culvert MP 8.60 and a culvert retrofit at MP 8.75. The crossings are spaced 800 feet apart and the overall channel slope between them is 9.0 percent.
Upstream Crossing, Mile Post 8.60
The culvert crossing at MP 8.60 is located approximately 6,400 feet (1.21 miles) upstream of the Stonybrook Creek confluence with Alameda Creek. The existing crossing consists of a grouted masonry channel 31 feet in length and a concrete bridge deck in good condition. The masonry channel under the bridge was constructed in 1938 and has since been grouted. It has a trapezoidal shape with a bottom width of approximately 9.0 feet and bottom slope of 3.9 percent.
The design at the upstream crossing includes: removal of the existing concrete and masonry culvert while providing temporary traffic access, re-grading of the channel in the vicinity of the crossing, with the placement of a new pre-cast concrete bridge. The bridge replacement consists of modular blocks that are used to construct wingwalls and bridge abutments, and precast deck panels that span the bridge opening.
Paving of the final roadway over the new bridge is also included. A custom bridge design is required to be completed by the Contractor and submitted to the County and District for review.
During construction, a temporary crossing will be used. Contractor shall furnish and install a Temporary Creek Crossing that will allow vehicular travel in a single direction for the duration of the construction. Lane width shall be 14 feet minimum. Crossing must accommodate CalFire vehicles. Guard rails shall be attached to the temporary crossing. Contractor shall grade and provide the approaches from the existing Palomares Road to the temporary crossing. A custom temporary bridge design is required to be completed by the Contractor and submitted to the County and District for review.
Downstream Crossing, Mile Post 8.75
The culvert crossing at MP 8.75 is located approximately 5,500 feet (1.04 miles) upstream of the Stonybrook Creek confluence with Alameda Creek. The crossing is a reinforced concrete box that is 8 feet wide and 9 feet tall. The culvert is 89.4 feet in length, including the inlet and outlet aprons, and has an overall slope of 7.3 percent. The crossing contains a large fill prism and the roadway is over 25 feet above the culvert invert.
The plan for the crossing at MP 8.75 includes installation of baffles throughout the box culvert and re-grading the upstream channel to eliminate the severe boulder jam in front of the culvert inlet. The preliminary baffle design optimizes fish passage conditions while avoiding a reduction in culvert capacity.
To eliminate the boulder jam at the inlet and improve upstream fish passage, this aggraded material will be removed. The channel will be regraded to have an overall slope of 10.8 percent, which is similar but slightly steeper than the natural channel grade between the two crossings. However, removal of additional material upstream to reduce the channel slope would necessitate excavation into bedrock. When regraded, the channel profile will be shaped into a step-pool morphology. The step-pool morphology will dissipate flow energy and provide fish passage conditions similar to the upstream channel.
Equipment access for work at MP 8.75 will be via the northeastern bank of the creek to the east of the existing roadway pull off.
All equipment will be staged in the eastbound lane of Palomares Road between MP 8.60 and MP 8.75. A staging area is located near the intersection of Palomares Road and Niles Canyon Road. Native rocks from the downstream boulder jam will be used for regrading the stream channel at the upper and lower crossings. Any excess material will be removed to the staging area. The project is located in an environmentally sensitive area and work must comply with permit requirements including dewatering of the work area, avoidance of sensitive habitat, and coordination with biological monitors.