Rogers E. Johnson & Associates provides geologic and hydrogeologic consultation to a variety of clients throughout central California. Since our inception in 1977, our primary objective has been to provide technical consulting services of the highest quality, ranging in scope from small, focused investigations to large, multi-disciplinary studies. We cater to a broad spectrum of clients, including individual homeowners, private developers, attorneys, governmental agencies, and major industries. Some of our recent institutional and corporate clientele include:

• City of Carmel-by-the-Sea Planning Department
• City of Santa Cruz Planning Department
• Pajaro Valley Water Management Agency
• University of California, Santa Cruz
• Santa Cruz County Planning and Public Works Departments
• Santa Cruz Municipal Transit District
• Aromas/San Juan School District
• Loma Prieta School District
• Natividad Medical Center
• Barry Swenson Construction
• Pebble Beach Company
• Hanover-Monterra Investors
• Nolan, Hamerly, Etienne & Hoss, Land Use Attorneys
• Lombardo & Gilles, Land Use Attorneys
• Richard Beale, Land Use Planning
• AAA - California

Services Provided
Rogers E. Johnson & Associates provides a full range of geological and environmental assessment services, from initial site evaluation to project planning and hazard mitigation. We use a variety of subsurface exploration, sampling and testing methods in our investigations, such as large-diameter downhole borings, hollow-stem augering, rotary drilling, hand augering and backhoe trenching. Our reports are prepared in accordance with the requirements of all concerned governmental agencies. We offer a wide variety of geologic services encompassing:

• Coastal hazards analysis
• Earthquake fault evaluation
• Landslide analysis
• Seismic ground-shaking parameters for slope stability analysis and structural design
• Probabilistic and deterministic seismic hazards analysis
• Hydrogeology
• Evaluation of liquefaction potential
• Land-use development studies
• Stereo aerial photograph analysis

Working in conjunction with local geotechnical (soils) engineering firms, we have established design criteria for landslide repairs, foundation design, excavation parameters, retaining walls, surface and subsurface drainage systems, and coastal protection structures.