Lettis Consultants International, Inc.

Lettis Consultants International, Inc. (LCI) is a private earth science and engineering geology consultancy headquartered in Concord, California. The firm is recognized throughout the United States and internationally as a leader in seismic hazard analysis for critical and high-consequence facilities, including nuclear power plants, dams, pipelines, LNG facilities, port terminals, and conventional structures. LCI's practice centers on integrating geologic, geomorphic, seismic, paleoseismic, and geospatial data to produce state-of-the-art geologic hazard characterizations for projects ranging from small targeted studies to multi-year programs. The company's technical services span geologic hazards, engineering geology, geotechnical engineering, and geospatial information management. Specific capabilities include paleoseismology, fault activity assessments and Alquist-Priolo fault studies, seismotectonic modeling, fault displacement hazard analysis, earthquake-induced liquefaction evaluation, post-earthquake investigations, and fault rupture mapping. LCI also provides detailed geologic mapping, subsurface exploration, landslide investigation and stabilization, foundation characterization, seismic retrofit studies, dam siting and deconstruction services, levee and embankment stability analyses, and licensing and regulatory compliance support. Its GIS and information management practice covers 4D GIS mapping, scientific visualization, remote sensing, drone imagery, LiDAR, multibeam, and radar data analysis. LCI serves a broad client base that includes large utilities and power companies, state and federal agencies, water districts, and local municipalities. Named clients include Pacific Gas & Electric, the California Department of Water Resources, SoCal Gas, Bechtel Corporation, URS Corporation, CalTrans, Santa Clara Valley Water District, East Bay Municipal Utility District, Lawrence Berkeley National Laboratory, and the U.S. Geological Survey. The firm has completed seismic hazard projects throughout the Americas, Europe, Africa, and Southeast Asia. LCI maintains a corporate headquarters in Concord, California, with additional offices in West Sacramento, Valencia, and Augusta, Georgia. Its staff includes geologists, seismologists, geotechnical engineers, GIS specialists, and information technology professionals, many holding advanced degrees and professional certifications such as CEG, PG, PE, and GISP. The firm is privately held and does not trade on a public exchange.

Lettis Consultants International, Inc. (LCI) was founded by William Lettis, a geologist, and is headquartered in Concord, California. The firm built its reputation on specialized expertise in seismic hazard analysis for critical and high-consequence facilities, a niche that requires integrating geology, geomorphology, seismology, paleoseismology, and geospatial data. Over time, LCI expanded its service lines to include engineering geology, geotechnical engineering, and GIS/information management, and it grew its geographic footprint with offices in Northern California (West Sacramento), Southern California (Valencia), and the Southeastern United States (Augusta, Georgia). LCI's project portfolio includes seismic hazard studies for nuclear power plants, oil and gas pipelines and offshore platforms, dams, LNG facilities, port terminals, water treatment plants, and other built structures. The firm has completed seismic hazard projects throughout the Americas, Europe, Africa, and Southeast Asia. Notable project experience cited by the company includes a surface-fault rupture hazard assessment of the Green Valley and Cordelia faults for CalTrans, a fault rupture evaluation for the Alameda County Water Agency, and a long-term seismic hazard program for Pacific Gas & Electric conducted at SSHAC Level III. LCI staff also worked on the Oroville Spillway emergency repair, the Caldecott Tunnel 4th Bore, and geotechnical investigations for Lawrence Berkeley National Laboratory. LCI emphasizes a strong commitment to research, participating in the latest scientific developments to provide innovative solutions. Its staff includes numerous professionals with advanced degrees and certifications such as CEG, PG, PE, and GISP. The firm remains privately held and continues to operate from its Concord headquarters and regional offices.

• Founded by William Lettis

• Established corporate headquarters in Concord, California

• Opened Northern California office in West Sacramento

• Opened Southern California office in Valencia

• Opened Southeastern United States office in Augusta, Georgia

A specialized, research-driven earth science consultancy recognized for state-of-the-art seismic and geologic hazard analysis on high-consequence infrastructure.

• Seismic hazard analysis

  Analysis for nuclear power plants, dams, pipelines, LNG facilities, and other critical structures.

• Paleoseismology and fault studies

  Fault activity assessments, Alquist-Priolo fault studies, fault kinematics, and fault displacement hazard analysis.

• Engineering geology and geotechnical services

  Detailed geologic mapping, subsurface exploration, liquefaction evaluation, landslide investigation, foundation characterization, and seismic retrofit studies.

• GIS and information management

  4D GIS mapping, scientific visualization, remote sensing, drone imagery, LiDAR, multibeam, and radar data analysis.

1. 1Lettis Consultants International, Inc. – Earth Science Consultantslettisci.com
2. 2Contact Us – Lettis Consultants International, Inc.lettisci.com
3. 3Geologic Hazards Services – Lettis Consultants International, Inc.lettisci.com
4. 4Engineering Geology Services – Lettis Consultants International, Inc.lettisci.com
5. 5Lettis Consultants International (United States) – Wikidatawikidata.org