News and Events

Be sure to visit our new Environmental and GeoForensics Division Web Sites!


San Diego State University EIS Complex
Benjamin Serna, PE, GE

Group Delta Bay Area Manager Ben Serna will be speaking at the 2016 Annual Fall Conference of the California-Nevada Section of the American Water Works Association (CA-NV AWWA). The conference will be held in San Diego, California October 24 through 27. He will discuss "Building a Water Storage Tank within 100 Yards of the San Andreas Fault: A Collaborative Approach" along with Jeffrey Wanlass of West Yost Associates and Kevin Peacock of DN Tanks. The AWWA was founded in 1881 to ensure safe and clean drinking water for everyone. AWWA and the CA-NV Section of AWWA are two associations linked together by a common belief and a common passion – safe and reliable drinking water. For more information and to register for the conference visit



San Diego State University EIS Complex

San Diego State University's new 90,000 ft2, 5-story Engineering and Interdisciplinary Sciences Complex (EIS) is taking shape. Group Delta is working closely with the Design-Build Contractor to provide as-needed geotechnical consultation for SDSU throughout its construction. Because of the sensitive nature of the equipment being utilized in the building, one of the key elements of the design included precise stabilization of the foundation and structure to avoid any potential ground movement and control vibration throughout the building. The complex was founded directly within dense formational materials using conventional shallow foundations at basement grades. The beginning phase of construction included tied-back soldier piles with wood lagging to safely excavate the new basement area.

Group Delta has provided geotechnical recommendations for grading, showing and foundation design, and is providing geotechnical testing and observation services during construction of the new complex. Watch it develop on SDSU EIS website's live cam at

With a 2017 completion date, the new EIS Building will be open in no time, ready to provide state-of –the-art instructional and research laboratory space for future scientists and engineers.



Anaheim Unified High School District Lab Visit

Group Delta is honored to be a part of Anaheim Union High School District's P21 Mentorship Program (Partnership for 21st Century Learning) representing an exciting and innovative collaborative opportunity. The focus of the program is on empowering students to succeed in academics, career, their community, and life. It was a pleasure to be able to host the first event at our Anaheim Laboratory with 20 selected seniors from Katella High School!



Rob Stroop
Photo by Port of Long Beach

On September 29, about 3,200 cubic yards of concrete was poured in and around 2,240 square feet of rebar forms to create a nearly two-story-tall pile cap to serve as a base for a tower at the Gerald Desmond Bridge Replacement Project. [Read Full Story].


I-405 Improvements

The Los Angeles Department of Building and Safety (LADBS) after a thorough review by its professional staff of geologists has confirmed that the Millennium Hollywood development site has no active earthquake faults or risk of surface rupture. On July 6, the LA Times reported "Studies by Millennium's geotechnical consultant, Group Delta, showed that there is probably a fault deep below the property that roughly follows the path indicated on the state's zoning map. However, contrary to the state's conclusions, the studies showed that the inferred fault was estimated to be at least 150,000 years old. City officials in June agreed with this conclusion, which was also reviewed by a third-party firm, Earth Consultants International." [Full Article]


ARTIC is Project of the Year

The Anaheim Regional Transportation Intermodal Center (ARTIC) project was selected as the Project of the Year (2014) by the Orange County Branch of the American Society of Civil Engineers (ASCE). The 67,000 square foot iconic transportation hub increases mobility options for residents, local businesses, commuters, and visitors to Anaheim, Orange County, and the entire Southern California region. The building reaching 117-feet high is housed in a diagrid steel shell structure (pictured above) and features the largest ETFE (Ethylene Tetra Fluoro Ethylene) roof expanse in North America. ARTIC is the first LEED Platinum Certified transit station in the world.

Group Delta
provided construction materials testing and inspection services during the construction of ARTIC. Some of the testing and inspections we provided included: rebar, concrete, forms, fireproofing, shop steel inspection, steel ultra-sonic testing, welding/bolting/field inspections, building inspection/MEP/HVAC.


I-405 Improvements

The Orange County Transportation Authority (OCTA) teamed up with The California Department of Transportation (Caltrans) for the San Diego Freeway (I-405). Currently, the San Diego Freeway (I-405) between State Route 73 (SR-73) and Interstate 605 (I-605) is in its initial stages of the widening process. This project will improve travel conditions for work, commerce, school, and recreation by improving traffic and interchange operations, increasing freeway capacity, and enhancing road safety to meet state and federal standards. The San Diego I-405 Improvement Project will be partially funded by Measure M (Orange County's half-cent sales tax) for this transportation improvements.

Group Delta conducted an aerially deposited lead (ADL) study in areas where near surface soil will be disturbed. Each bridge proposed to be reconstructed will be analyzed for the presence of asbestos containing material and lead based paint. Groundwater at the existing bridges located near potential recognized environmental concerns will be evaluated for any possible groundwater contamination.

In addition, Group Delta is providing preliminary geotechnical recommendations for foundation design, liquefaction potential, maximum credible seismic events and PBA, ARS curves, design level geotechnical investigations, and reports of subsurface conditions for this segment of the I-405 and its bridges.



Group Delta ISO-IEC 17025:2005 Certificate of Accreditation

Group Delta is pleased to announce that our San Diego laboratory has been awarded accreditation to the technical competence and quality assurance requirements of ISO/IEC 17025 as determined by the AMerican Association of State Highway and Transportation Officials (AASHTO).



NFL Stadium Hollywood Park

Group Delta is proud to announce that we are working on the new NFL-caliber football stadium to be located in Inglewood, California. The proposed 80,000-seat stadium will be built between the Forum concert hall and the former site of the Hollywood Park horse racing track. The stadium will be a multipurpose facility and designated to host future football games, soccer games, and Olympic events. If voters approve, the stadium could be completed by 2018 and will be built alongside a $2 billion complex that will house residential, retails, hotels, and office complexes. Group Delta will be conducting geotechnical subsurface explorations, laboratory testing, and engineering analysis.

In November 2014, the California Geologic Survey released the finalmap of earthquake fault zones in the Hollywood Quadrangle. The map shows estimated traces of the Hollywood Fault running through downtown Hollywood. In the video below, Group Delta CEO Michael Reader discusses the trench investigations we conducted at four sites where the fault was thought to exist.

The map defines a new earthquake hazard zone in Hollywood that requires most new construction projects within this zone to conduct a fault rupture investigation prior to construction permits being issued. Group Delta has a team of expert geologists and paleoseismologists who have decades of experience in locating faults within Alquist-Priolo Zones. See our page on fault investigations for more details.



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Group Delta Consultants, Inc.
32 Mauchly, Suite B, Irvine, CA 92618
370 Amapola Avenue, Suite 212, Torrance, CA 90501
9245 Activity Road, Suite 103, San Diego, CA 92126
1320 S. Simpson Circle, Anaheim, CA 92806
1035 S Milliken Ave, Suite G, Ontario, CA 91761
1970 Broadway, Suite 1100, Oakland, CA 94612