I-80 / Central Avenue Operational Improvements Phase 1

Ghirardelli Associates was selected by CCTA to provide construction management services for this project which improves the traffic operations at the I-80/Central Avenue interchange and along Central Avenue between Rydin Road and San Pablo Avenue. The project will be completed in two phases. Phase 1 redirects left turns from westbound (WB) Central Avenue onto I-80 WB to the adjacent I-580 eastbound onramp at Rydin Road during weekend peak hours; and installs traffic signals at the I-580 ramps. The project also included installing 17 new ADA curb ramps along Central Avenue between Highways 80 and 580.

Ghirardelli Associates staff inspected the signalization of two 4-way stop intersection, the installation of four new variable message signs and overhead sign structure, the removal and replacement of 17 new ADA compliant curb ramps and the removal and installation of 100-feet of new barrier rail over the Union Pacific Railroad (UPRR) and Highway 580. We monitored compliance with the contract plans and specifications, as well as recorded and reported all construction activities and maintained reports in a project file. We maintained construction diaries that included documentation of the work progress, materials tested, and any other pertinent information in a daily diary for permanent record of events.
Photographs of project progress were taken on a regular basis and kept for permanent records to verify quality for acceptance.

The project also processed a million-dollar change order to remove and replace 3,000 tons of asphalt concrete along Central Avenue between Pierce Street and the I-580 overcrossing.
This project included many different inspection disciplines including, structures, civil, and electrical and required coordination with multiple different entities including, Contra Costa Transportation Authority, City of Richmond, Caltrans, East Bay Municipal Utility District, AT&T, UPRR, Stege Sanitation, and PG&E. The project staff, especially our field inspector, work very hard to make this project a success for both Ghirardelli Associates and our client.

Client: Contra Costa Transportation Authority (CCTA)
Location: Richmond, CA

GAI Awarded Construction Management Services for Slope Stabilization Project


Ghirardelli Associates was selected by OCTA to provide construction management services for the Los Angeles – San Diego – San Luis Obispo Rail Corridor (LOSSAN) Right of Way (ROW) Slope Stabilization Project.
The scope of work requires working within an active rail corridor and brings a unique set of challenges that require a combination of both methodical planning and the ability to adapt to the types of unforeseen conflicts typical of underground construction.
The LOSSAN rail corridor serves Metrolink, Amtrak, as well as Union Pacific and BNSF freight trains and is identified as the second most heavily traveled intercity passenger rail corridor in the nation. With combined annual ridership in excess of 7 million passengers, and the transport of countless tons of cargo, the maintenance and operation of this corridor is a key element in the functionality of the region’s overall transit system. The LOSSAN Slope Stabilization project is intended to repair previous erosion damage and to prevent future issues via a combination of enhanced drainage facilities and slope armoring.
Key Project Elements include:

  • Selective Slope Grading and Geosynthetic Armor Installation
  • Install Shotcrete along Slopes Close to Tracks
  • Railway Coordination
  • Utility Protection and Carrier Coordination
  • Underdrain Construction
  • Gunite Channel Construction
  • Rip-Rap Energy Dissipation Installations
  • Storm Water Pollution Prevention Planning (SWPPP) and Execution
  • Site Management Per SCRRA Requirements
  • Federal Transit Administration Funded Project

Client: Orange County Transportation Authority (OCTA)
Location: Orange, CA

GAI Awarded Washington District Sustainable Community Infrastructure Project


Due to its age and the demands of urban development, additional strain has been revealed in the Washington District’s infrastructure, including inadequate water, sewer, storm drain, and transportation backbones. Substantial utility and street improvements are needed in order to accommodate existing and alternative modes of travel in the neighborhood.
Ghirardelli Associates was selected by the City of West Sacramento to provide construction management services for the District project to correct infrastructure deficiencies. Sidewalks will be made more accessible, bike lanes added, and several roadways will be re-evaluated for more efficient multi-modal traffic flow. Large street canopy trees will be preserved, and new street trees will be planted. The project will also be designed to handle a future streetcar extension that will circulate along the Third Street corridor, jogging west to 5th Street and then east on C Street and over the new bridge to connect to Railyards Boulevard in Sacramento. Water, sewer, and storm lines will be upsized and replaced, and overhead utilities will be placed underground where feasible.
Construction is currently underway and is expected to be completed by January 2019. The funding sources will be a $4.2 million climate investment fund grant awarded by the California Strategic Growth Council for Infrastructure, the state Active Transportation Program (ATP), and local match by the city of West Sacramento’s community investment fund and sewer impact fees. The estimated design and construction cost is $5.7 million.
Client: City of West Sacramento
Location: West Sacramento, CA