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 to replace the existing Fire Protection District Fire Station #86. The 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 an […]

Brentwood WWTP Expansion Phase II

Expansion of a wastewater treatment plant from 5 MGD to 10 MGD. Scope includes modifying existing wastewater treatment facilities and constructing new wastewater facilities, including process structure and buildings, roads, civil/site work, and landscaping.  

Gilroy Wastewater Treatment Plant Expansion

Expansion of a wastewater treatment plant from 8.5 MGD to 11 MGD. Construction includes a new membrane bioreactor (MBR) complex with new headworks, solids dewatering, and electrical buildings. Scope also covers new structures for oxidation, membrane equipment, blowers, utility/WAS/MLT pump station, chemical facilities and emergency power.

Las Positas College Agriculture Science Horticulture Facility

New 7,970 SF Horticulture Facility designed to achieve LEED Silver certification and includes new classrooms, labs, offices and resource area, a greenhouse, plus outdoor growing areas and learning patio. Scope also covers a new parking lot, sitework, and utilities.

Las Positas College Public Safety Complex & Advanced Manufacturing Transportation Facility

New LEED Silver buildings to provide modern career technology facilities and support spaces for the Fire Technology, Administration of Justice, Emergency Medical Service, Auto Technology and Welding programs at the college. The Public Safety Complex (PSC) and Advanced Manufacturing and Transportation (AMT) buildings are co-located to allow for shared linkages between programs, classrooms and event […]

El Portal Place

San Pablo Micro Units

In a unique public-private partnership, Overaa will renovate an old building in San Pablo to accommodate 54 residential units. The project will provide permanent supportive housing for up to 58 people experiencing, or at risk of experiencing, homelessness. The design-build, adaptive reuse project will reimagine the two-level, 27,000 SF building as a community of small […]