San Leandro High School New Gymnasium

Overaa is constructing a new state-of-the art gymnasium for the San Leandro Unified School District. The 55,000 square foot facility includes three courts and approximately 3,000 seats as well as academic and athletic support spaces. The work includes site improvements and demolition of an existing gymnasium on campus.

CCCSD Pump Station Phase 2A

For our long time client, Central Contra Costa Sanitary District, we are installing two new 12.4 MGD sewage pumping stations and the associated equipment in Martinez, CA. The work includes heavy civil, mechanical, electrical, instrumentation, and controls, and the installation of new PG&E services, demolition and decommissioning of the existing pump stations.

Gilroy WWTP Plant Expansion

South County Regional Wastewater Authority (SCRWA) manages the treatment of wastewater and also operates a recycled water facility to irrigate local parks, golf courses, landscape medians, agriculture and industrial uses. The expansion project expands the WWTP using membrane bioreactor (MBR) technology to increase the current capacity of 8.5 MGD to 11 MGD to accommodate planned […]

Salinas Valley Health Parking Structure

Salinas Valley Health has roots running back to 1953 when its hospital was first founded to service the Monterey County community.  To provide more parking at the campus, Overaa is expanding the existing parking garage. The design build project includes four levels of parking above a basement level containing support spaces and loading dock. The […]

Central Contra Costa Sanitary District Mechanical & Concrete Renovations

Construction of a temporary bypass pump station plus renovations and replacement of failing mechanical equipment. This included renovations of sluice gates and primary sedimentation guide rails, and the repair of Fiberglass Reinforced Plastic (FRP) odor control equipment, crack repair, concrete coating and permeation grouting. The final design included 11 diesel driven pumps that required full […]

Columbine Station Improvements

Columbine Station serves as the primary water storage facility for many residents in San Jose, CA. This project involves the demolition of the 19.6 million gallon concrete reservoir built in 1963 and the construction of two new 5 million gallon pre-stressed concrete water storage tanks. Upon completion, the new tanks will provide 10 million gallons […]

Manteca TCP Mitigation Project

Design and construction of the installation of Granular Activated Carbon (GAC) treatment systems to treat and remove 1,2,3 -Trichloropropane (TCP) from City of Manteca, CA, groundwater. Scope included start-up and commissioning of the new systems and associated improvements for five existing wells at four separate sites. Careful coordination of construction near and sometimes adjacent to […]

Marin Academy Aquatic Center

Replacement of an existing 90-year old pool on campus with a new 13-lane competitive swimming pool. Construction included an all-new support building to house locker rooms, shower and bathroom facilities, office space, mechanical equipment, plus delivery/storage areas. The Aquatic Center serves Marin Academy students, faculty, and staff in both athletic and academic endeavors while also […]

Central Contra Costa Sanitary District Filter Plant & Clearwell Improvements

Modifications to a wet weather holding basin plus the construction two 3 million gallon recycled water storage tanks, an electrical substation, and a motor control center to allow a 54 MGD treatment plant to allocate more of its treated water for recycled water uses within the community. Scope also included rehabilitations to pump stations and […]

Contra Costa County Fire Station NO. 86

New 10,856 SF LEED Silver designed fire station station that replaced the existing Fire Protection District Fire Station #86. The new one-story structure includes three apparatus bays, kitchen, dorm rooms, offices, restrooms, training, exercise, storage, day and dining rooms along with all associated HVAC, electrical, civil site work, and landscaping. The new station also includes […]