Offices


ConcordGeolocation: 38.0191, -122.0318

The Concord office is conveniently located to serve the cities in Contra Costa County.

In addition to our core service lines of environmental, geotechnical, and materials, the Concord office is the “center of excellence” for providing aquatic design and swimming pool engineering services for public and privately funded projects throughout the United States. RI joined Terracon in December of 2014. RI has been a proven leader in aquatic design and engineering for more than 40 years, and has designed more than 600 commercial swimming facilities for numerous publicly funded and private entities. The combination of experience from these key acquisitions has resulted in an expansion of aquatic design services. Our services include in-house aquatic design, swimming pool structural engineering, and swimming pool electrical engineering. In addition, the office laboratory is AASHTO accredited for soil and aggregate.

Key Projects


Aquatic Design and Swimming Pool Engineering at Novato High SchoolGeolocation: 38.0896, -122.5728

Terracon completed a swimming and water polo competition regulation pool for the Novato Unified School District in Novato, Calif. The pool is used by two of the districts high schools’ student athletes and the community. Aquatic competition courses include 25-meter and 25-yard swimming, 25-meter water polo and 1-meter springboard diving.


Calaveras Dam ReplacementGeolocation: 0, 0

Folsom Dam Auxiliary Spillway, Phase IVGeolocation: 0, 0

The $900 million Folsom Dam Auxiliary Spillway Project is a cooperative effort between the US Army Corps of Engineers and the US Department of the Interior, Bureau of Reclamation to help the Sacramento region improve its ability to withstand and manage large flood events by constructing a new spillway for the historic Folsom Dam. The project involves the fourth and final phase of spillway construction which includes a temporary coffer dam, concrete work for the 1 mile chute and energy dissipation blocks and stilling basin, and installation of instrumentation and controls.

Neil O.…


Gaffey Street Pool (Hey Rookie Pool)Geolocation: 33.7137, -118.2929
The Gaffey Street (“Hey Rookie”) Pool was built in 1943 on what was the former Fort MacArthur military base. The pool was built with funds from an Army road show called “Hey Rookie” and was the spot of synchronized swim shows featuring actor Sterling Holloway. It was later opened to the public in 1954, and was eventually added to the National Register of Historic Places. The once popular World War II era pool recently completed extensive renovations in order to re-open to the public. Terracon worked together with Paul Murdoch Architects and the City of Los Angeles to restore the…

Geotechnical Engineering at Yosemite Slough RestorationGeolocation: 37.775, -122.4183

Terracon performed grading operations of approximately 265,800 cubic yards of soil to increase wetland area from nine to more than 20 acres at the Yosemite Slough Restoration in San Francisco. This included nesting islands, nursery acres for fish, interpretive trails and center, and 2.5 acres of recreation area. Terracon provided quality control services including inspection of cut and fill materials, wetland top soil and upland fill and cover. The team also conducted compaction testing to verify wetland soils met critical minimal and maximum density requirements and specifications.


Materials Testing for the Rankin Aquatic CenterGeolocation: 38.0138, -122.1449

Terracon provided geotechnical, swimming pool engineer-of-record, material testing, and inspection agency services for construction of the two community aquatic centers for the City of Martinez, Calif. The team managed quality assurance and quality control including site grading, field density testing, lime treatment, concrete, rebar sample and tagging, reinforcement, masonry, and asphalt paving.


Perris Dam Seismic RemediationGeolocation: 0, 0
Perris Lake is the final reservoir of the California Aqueduct in Southern California. In 2005, DWR identified potential seismic safety risks in a section of the foundation of the 126 foot high earth fill dam and lowered the operation lake level 25 feet to ensure maximum public safety until dam repairs could be made. Remediation consists of Cement Deep-Soil Mixing (CDSM) and a new toe berm along a 1 mile section of the dam toe. Due to concerns construction activities associated with the remediation work would have on dam stability, DWR required an extensive real time monitoring system…