Mosquito Rd at South Fork American River Bridge Replacement Project, Placerville CA

This is a 580 working day Project. Construction consists of a cast-in-place pre-stressed concrete segmental box girder bridge over South Fork American River; construction of soil nail, tie-back, soldier pile, and reinforced concrete retaining walls; construction of cast-in-drilled-hole (CIDH) concrete piles and optional micropiles; and grading, paving, and drainage system improvements for the re-aligned roadway. Performance, construction or installation of other items or details not mentioned above, that are in the Plans, Standard Plans, Standard Specifications, or these Special Provisions. Bidding for this Project consists of a Base Bid (Schedule A) with all Pier 2 Alternative Bids (Schedule B through D) and Pier 3 Alternative Bids (Schedule E through H) in accordance with the Proposal, Special Provisions, and Agreement. All bids will be compared by the summation of Proposal Pay Items and Bid Price Schedule for the Base Bid (Schedule A), lowest schedule bid for Pier 2 (Schedules B, C, or D), and lowest schedule bid for Pier 3 (Schedules E, F, or G).

Additional Description: BASE BID (SCHEDULE A): Consists of constructing bridge pile caps, abutments, piers, superstructure, approach slabs, and barrier rails; bridge abutment return walls and Type 1A retaining walls; pier soldier pile, tie-back, and soil-nail retaining walls; roadway approach sections, Type 1 & 1A retaining walls, culvert, drainage structures, and Midwest Guardrail Systems (MGS); all associated excavation, structure backfill, embankment fill, and rock slope protection. PIER 2 ALTERNATIVE BIDS (SCHEDULES B – D): Consists of construction and installation of CIDH piles. All Pier 2 alternatives (Schedules B – D) consisting of 36”, 48”, and 60” CIDH must be bid. After bid opening, the lowest cost Pier 2 alternative schedule will be the Contract Pier 2 Alternative Bid Schedule for construction. PIER 3 ALTERNATIVE BIDS (SCHEUDLES E – H): Consists of construction and installation of CIDH piles or micro-piles. All Pier 3 alternatives (Schedules E – H) consisting of 36”, 48”, and 60” CIDH, and 10” micropile alternative schedules must be bid. After bid opening, the lowest cost Pier 3 alternative schedule will be the Contract Pier 3 Alternative Bid Schedule for construction.  Project Completion date to be 11/1/2024.