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Employee Profiles: Senior Professionals
Philip L. Johnson
Supervising Engineering Geologist
Registration
Registered Geologist in California, RG 6196
Certified Engineering Geologist in California, CEG 2019
Education
M.S., Geology: San Jose State University, San
Jose, California, 1990
B.A., Geology: San Francisco State University, San Francisco, California,
1987
Areas of Specialty
Investigation and repair of landslides; landslide
mapping and aerial photograph interpretation; subsurface investigation
of landslides; geotechnical construction defect litigation support;
dam site investigations; seismic hazard assessment; and sedimentary
geology
Representative Experience
Mr. Johnson has over 19 years of experience in the field of engineering geology, working on projects throughout California. He has been involved with numerous geologic investigations involving slope stability, seismic hazards, sea bluff retreat, groundwater, and other geotechnical issues. He also regularly participates in peer review for communities in the San Francisco bay area. He has a variety of areas of expertise including:
• Geologic characterization of landslides for design of mitigation measures. He has investigated numerous landslides ranging from large, deep-seated landslide complexes to shallow colluvial landslides and debris flows.
• Landslide mapping and aerial photograph interpretation. He has mapped landslides in a wide variety of terrain utilizing both field mapping and aerial photograph interpretation.
• Subsurface investigation utilizing downhole logging of large-diameter boreholes, core logging, and trench logging methods.
• Engineering geologic aspects of surface mine reclamation with emphasis on stability of former mine slopes.
• Assessment of seismic ground shaking and fault rupture hazards for large engineered structures as well as light construction. Projects include fault rupture hazard and paleoseismic investigations on the San Andreas, Las Positas, and Valley Side faults.
• Investigation of geotechnical construction defect and building distress related to expansive soils, fill settlement, incipient slope deformation, and landsliding.
• Engineering geologic investigation of dam sites. He was Project Geologist for two potential dam sites for East Bay Municipal Utility District. He also participated in a seismic hazard investigation of the Foothills fault system for the New Hogan Dam in the Sierra Nevada foothills. He also mapped the geology exposed during construction of a soft ground tunnel at Crystal Springs Reservoir. Recently, he conducted subsurface investigation, field mapping, and permeability testing at an existing dam on the Stanislaus River.
• Fluvial sedimentology with particular emphasis on the use of detailed fluvial architecture to evaluate tectonic basin subsidence and basin history.
• Hydrostratigraphic investigations utilizing core samples, borehole geophysical, and hydrogeologic data.
Recent projects include photogeologic and field mapping of landslides in the Ridge Basin
in Los Angeles County; photogeologic mapping of fluvial geomorphic features in the San Joaquin River delta; downhole logging of large-diameter borings during investigation of landslides in the
City of Richmond; inspection and evaluation of quarry slopes in Santa Clara County; investigation of an incipient
landslide in Clayton; evaluation of fault rupture hazards on the east side of the Coast Ranges; investigation of
debris flows in Pacifica, Lafayette, and Orinda; photogeologic evaluation of landslide and fault rupture hazards
in Santa Rosa; subsurface investigation of a large, deep-seated landslide in Santa Barbara; a fault rupture hazard
investigation along the San Andreas fault in Pacifica; investigation of a large, deep-seated coastal bluff failure
in Daly City; subsurface investigation of a gravel quarry slope failure in alluvial and lacustrine sediments in
Livermore; photogeologic and field mapping to evaluate geologic constraints to a proposed bicycle trail alignment
adjacent to a large landslide complex in San Jose.
As a graduate student, Mr. Johnson studied Tertiary
fluvial rocks exposed on the flanks of the Rock Springs Uplift in
southwest Wyoming. Based on the spacing of fluvial channels within
overbank deposits and thickening of synorogenic sedimentary packages,
he was able to evaluate the timing and pattern of Paleocene to early
Eocene subsidence across the southern Greater Green River Basin
and relate this to thrust faulting within the Uinta and Rock
Springs uplifts.
Professional History
Supervising Engineering Geologist, 1995-Present; Cotton,
Shires and Associates,
Los Gatos, California
Staff Geologist, 1992-1995; Dames & Moore, San Francisco, California
Staff Geologist, 1990-1992; Earth Sciences Associates, Palo Alto,
California
Professional Affiliations
American Geophysical Union
Association of Engineering Geologists
Geological Society of America
International Association of Sedimentologists
Society for Sedimentary Geology (SEPM)
Publications
Johnson, Philip L. 2009, Landslides and geomorphic mapping along the Rodgers
Creek - Healdsburg fault, Sonoma County, California: in Proceedings of the 52nd Annual
Meeting of the Association of Engineering and Environmental Geologists, Lake Tahoe, California, p. 81
Johnson, Philip L. and David W. Andersen, 2009, Concurrent growth of uplifts
with dissimilar orientations in the southern Green River Basin, Wyoming: implications for Paleocene-Eocene
patterns of foreland shortening: Rocky Mountain Geology, v. 44, p. 1-16
Johnson, Philip L., Marcum, Dale R. 2007, The Northridge Bluff Landslide:
rapid bluff retreat associated with a major coastal landslide in Daly City, California: in Schaefer,
V. R., Schuster, R. L., and Turner, A. K., eds., Conference Presentations, First North American
Landslide Conference, Association of Environmental and Engineering Geologists Special Publication No. 23, p. 1694-1706
Johnson, Philip L., Shires, Patrick, O., 2007, Engineering geologic evaluation of quarry slopes and compliance
with California's Surface Mining and Reclamation Act: in
Proceedings of the 50th Annual Meeting of the Association of Engineering Geologists, Los Angeles, California
p. 94
Johnson, Philip L., 2005, The Glen Creek Landslide:
a case study in the misuse of the Jahnsian steps during hillslope
development: in Ehlen, J., Haneberg, W.C., and Larson, R. (eds.)
Humans as Geologic Agents, Geological Society of America,
Reviews in Engineering Geology, v.11, no. 1, p. 111-121.
Johnson, Philip L., and Cotton, William L., 2005,
The Santiago landslide and associated ridge-top graben: implications
for paleoseismic landslide studies: Environmental and Engineering
Geoscience v. 11, no. 1, p. 5-16
Johnson, Philip L. and Cotton, William R., 2003,
An alluvium-buttressed landslide complex and the impact of late
Quaternary sea level change on landslide topography [abs.]: in Proceedings
of the 46st Annual Meeting of the Association of Engineering Geologists,
Vail, Colorado, p. 62.
Johnson, Philip L. and Cotton, William R., 2002,
The Santiago Landslide and associated ridge-top graben: implications
for paleoseismic landslide studies [abs.]: in Proceedings of
the 45nd Annual Meeting of the Association of Engineering Geologists,
Reno, Nevada, p. 70-71.
Johnson, Philip L. and Cole, William F., 2001,
The use of large-diameter boreholes and downhole logging in landslide
investigations: in Horacio Ferriz (ed.) Engineering Geology
in Northern California, California Department of Conservation,
Division of Mines and Geology, Bulletin 210, p. 95-106.
Wallace, J.M. and Johnson, Philip L., 1999, The
use of large-diameter boreholes and downhole logging techniques
in landslide investigations [abs.]: in Proceedings of the 42nd
Annual Meeting of the Association of Engineering Geologists,
Salt Lake City, Utah, p. 88.
Johnson, P.L., 1990, Laramide basin subsidence
and fluvial architecture of the Fort Union and Wasatch Formations
in the southern greater Green River basin [abs.]: American Association
of Petroleum Geologists Bulletin, v. 74, p. 687.
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