Site work for a civil project in Winton, California. Completed plans call for site work for a bridge / tunnel.

The Project consists of work aimed at improving fish habitat and water reliability in the Merced River by consolidating three points of diversion and enhancing aquatic habitat for salmonids. Two ponds, Pond 11 and Pond 12, that serve as current points of diversion will be converted into seasonally inundated off-channel habitat through removal of headworks and structures, and the placement of coarse sediment and new box culverts. At Pond 11, existing intake structures will be removed along with an outflow box structure. Grading in Pond 11 will occur to increase the amount of seasonally inundated rearing habitat, but also generate material to be used as fill throughout other work areas. Within Pond 11, "fines" and "fish rock" sediment will be placed in the channel. A new box culvert with wing walls will be placed at the outlet of Pond 11 to allow for access. The culvert will be embedded with "fish rock" and "6" coarse sediment" will be placed for erosion control at the culvert inlet and outlet. Similarly, at Pond 12, existing intake structures will be removed along with an outflow box structure. Grading in Pond 12 will occur to increase the amount of seasonally inundated rearing habitat. Within Pond 12, "fines" and "fish rock" sediment will be placed in the channel. A new box culvert with wing walls will be placed at the outlet of Pond 12 to allow for access. The culvert will be embedded with "fish rock" and "6" coarse sediment" will be placed for erosion control at the culvert inlet and outlet. To mitigate for the loss of Pond 11 as a water source, an upright delivery structure, a 27" PVC pipeline, a pump irrigation box and a screening irrigation box will be installed. An existing concrete weir will be removed near Pond 11 and in its place a spawning riffle will be constructed using a specific gradation of river rounded sediments called "fish rock". An existing gabion diversion and headworks will be removed and replaced with two cone fish screens, a 72-inch diameter pipeline and flow control structure that will transition into an existing ditch. The flow control structure will have a concrete headwall and rip-rap transition to the existing ditch. At the upstream limit, an anabranch will be constructed to allow for more flow to enter the main channel. The anabranch will be constructed by excavation and placement of a layer of "fish rock" sediments. Adjacent to the anabranch, a neck cutoff area will be graded, and an engineered riffle installed to allow low flows to stay in the main channel and pass the diversion. The engineered riffle will be constructed of 12-inch coarse sediment. Willow staking will occur in areas filled with excess fine sediments adjacent to the engineered riffle. The material excavated from Pond 11 will be the primary material source for fill activities. Screening of this material will occur to generate the five different sediment mixtures. These mixtures are defined on the plans but are called, "fines", "fish rock", "fish rock coarse," "6" coarse" and "12" coarse." If suitable material is not generated from this area there are two areas designated on the plans that could be used to generate material. Otherwise, material will need to be imported. Excess material will be placed following the owner's representative direction. The Project will require the operation of construction equipment (e.g., rubber-tired front-end loaders, excavators, and articulated haulers, etc.) in the Project boundary. Gravel and cobble will be deposited in-stream and placed by rubber-tired front-end loaders (e.g., Caterpillar 950 Loader). To minimize any potential negative effects on salmonids, in-stream gravel placement activities will occur during summer/early-fall (15 July to 15 October) when flows are low (approximately 200-cubic feet per second (cfs)) and active salmonid spawning is not occurring. However, the contractor should be comfortable working under a range of flows, typically between 200-cfs to 3,000-cfs, as dam releases may change during construction. Construction is anticipated to occur over one season and will require approximately 20 weeks. Work will occur Monday-Friday from 7:00 am to 5:00 pm to ensure minimal disturbance to local landowners. WORK LOCATION: The project is located in and adjacent to the Merced River, approximately 3.8 miles downstream of the Highway 59 bridge and 1.7 miles northwest of the intersection of Princeton Road and Buhach Road in Merced County, CA. Bids shall be accompanied by a Proposal Guaranty of a certified check or Bidder's bond of not less than ten percent (10%) of the total amount of the Bid, made payable to the order of the Merced Irrigation District, to be retained as liquidated damages by the District if the successful Bidder fails to enter into a Contract. Upon entering into a contract, the successful Bidder will be required to furnish a Performance Bond and a Payment Bond, each for 100 percent of the contract amount. Milestone 3: Substantial completion on or before December 15, 2024. Milestone 4: Final completion on or before January 15, 2025. The Merced Irrigation District reserves the right to reject any or all Bids, or to waive any informalities. If awarded, a contract will be awarded within 10 calendar days of the Bid opening. The Contract shall be signed within 10 working days after receipt of the Notice of Award. Questions deadline: 6/21/24 at 5:00 PM Every request for interpretation or correction of any ambiguity, inconsistency, or error, should be submitted through the MID Procurement Portal, under Messages/Opportunity Q&A Online.