News and Events

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


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].


Rob Stroop

Rob is a Geotechnical & Civil Engineer with nearly 30 years of experience on a wide range of local and international projects. Rob will combine his wide-ranging experience with Group Delta Consultant's extensive resources to continue to fulfill his primary goal of providing value to clients by devising engineering solutions to decrease the cost of constructing their projects. As a Project Manager in our San Diego office, Rob's primary focus will be to continue to fully understand client processes to provide engineering services in a timely and efficient manner. He has undertaken leadership roles on major infrastructure projects with construction values from $500 Million to over $1 Billion. Rob has completed projects throughout California and Internationally. His most recent projects include the San Diego Central Court (construction value of $550 Million) and the One La Jolla Center office building.


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.


SDSU South Campus Plaza

San Diego State University's South Campus Plaza, a mixed-use housing and retail project began construction in the fall of 2014 (live webcam). This $143-million project will include housing for more than 600 students, all while creating an on campus destination for shopping and dining. Located in the heart of campus and directly South of the SDSU Transit Center, South Campus Plaza creates a more accessible gateway to the university for students, as well as those in the surrounding neighborhood. South Campus Plaza is a major redevelopment project providing two new 6 story mixed-use complexes. This provides the campus with 225,000 gsf of residential and retail space along with a new 6 story 122,000 gsf parking structure.

  • Group Delta provided a design geotechnical report, as needed design support, plan & specification review.
  • Group Delta will be providing the earthwork observation & testing.

The renovation is scheduled to be completed Fall 2016. SDSU is determined to maintain a commitment to sustainability, and South Campus Plaza is no exception. The South Campus Plaza is designed to be Leadership in Energy and Environmental Design (LEED) Silver Certified, along with introducing measures to reduce water use.

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
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