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Employee Profiles: Senior Professionals
John M. Wallace
Principal Engineering Geologist
Registration
Registered Geologist in California, RG 6151
Certified Engineering Geologist in California, CEG 1923
Education
M.S., Geology: San Jose State University, San
Jose, California, 1991
B.S., Geology: University of Southern California, Los Angeles, California,
1985
Areas of Specialty
Investigation and characterization of unstable
hillsides; investigation of hydroelectric facilities and siting
studies for dam sites; geologic mapping of vertical rock slopes
using rock climbing techniques; tunnel and shaft geologic mapping;
seismic site assessment; evaluating geotechnical data for planning
and community development; photogeologic mapping from aerial photographs;
large-scale and regional engineering geologic field mapping; coordination,
logging, and analysis of subsurface exploration programs; installation
and monitoring of slope inclinometers and piezometers; geotechnical peer review
Representative Experience
Mr. Wallace has over 20 years of experience in
the fields of geology and engineering geology, working on projects
in both northern and southern California as well as Colorado, Utah, South Dakota
and Hawaii. Mr. Wallace has extensive experience in landslide investigation,
characterization, and mitigation. He has recently performed detailed
geologic investigations of several large, active landslides that
severely distressed roadways and residential areas, including the Sycamore
Ranchito Landslide in Santa Barbara, the Northbeach Rockslide in San Francisco,
the Ocean Trails Landslide in Rancho Palos Verdes, the Montellano Landslide
in Los Angeles, in addition to other past large landslide investigations
including Amesti Road Landslide in Watsonville; the Alpine Road Restoration
Project in Portola Valley; Old Santa Cruz Highway landslides, Santa Clara County;
Anaheim Hills Landslide, the Partridge Knolls Landslide; The Weeks Creek Landslide,
and the Manoa Valley Landslide in Oahu, Hawaii. These projects involved extensive
surface and subsurface investigation, instrumentation, and analysis. He also
performed geologic mapping and evaluation of steep rock slopes affecting
more than 20 penstocks and powerhouses within PG&E's hydro-generation facilities
in northern, central and southern Sierra Nevada, in addition
to extensive experience in hydro-projects as mapping dam abutments, tunnels
and penstock alignments, as well as tunnel, abutment, and portal rock bolting.
Mr. Wallace has also been involved with geologic mapping and siting studies
for several fault and landslide constrained reservoirs, and recently mapped
unstable coastal bluffs in Mendocino, Bodega Bay, Capitola, Aptos, and Pacifica.
Many of these projects involved using rock climbing techniques to safely access steep rock
slopes.
As a field geologist with Electrowatt/Gibbs and
Hill from 1986 to 1988, Mr. Wallace participated in the exploration
and construction phases of the North Fork Stanislaus Hydroelectric
Project, where he was involved in siting studies for four dam sites
(including one thin-arch concrete dam, one concrete-face rockfill
dam, and two concrete gravity dams) and over ten miles of pressure tunnel and shafts.
His responsibilities included geologic mapping, exploratory drilling
and core logging, rock bolt support layout for dam abutments, geotechnical
instrumentation installation and monitoring, exploratory trench
logging, and extensive tunnel mapping of 10 miles of pressure tunnels
and shafts, tunnel rock bolt support layout, and pressure grouting
supervision.
Professional History
Staff to Supervising Engineering Geologist, 1990
- Present; Cotton, Shires and Associates, Inc., Los Gatos, California
Field Geologist, 1986-1988; Electrowatt Engineers/Gibbs and Hill,
North Fork Stanislaus Hydroelectric Project, Murphys, California
Field Geologist, 1986; United States Geological Survey, Denver,
Colorado
Professional Affiliations
Association of Engineering Geologists
Selected Publications
GEOLOGIC AND GEOTECHNICAL CHARACTERIZATION OF
THE WEEKS CREEK LANDSLIDE, SAN MATEO COUNTY, CALIFORNIA: 1994 (with
William F. Cole and Patrick O. Shires), National Earthquake Hazards
Reduction Program, U. S. Geological Survey grant 1434-93-G-2340.
GEOLOGIC INVESTIGATION OF MECHANISMS CAUSING DEFORMATION
OF COYOTE LAKE DAM, SANTA CLARA COUNTY, CALIFORNIA: 1994 (with Tim
Hall, Michael Angell, and William F. Cole), in Geological Society
of America, Cordilleran Section 90th Annual Meeting, March 21-23,
1994, San Bernardino, California, Abstracts with Programs, p. 56.
GEOLOGIC CONSTRAINTS ON THE QUATERNARY TECTONIC
HISTORY OF THE NORTHEASTERN MARGIN OF THE CENTRAL SANTA CRUZ MOUNTAINS,
CALIFORNIA: 1994 (with William R. Cotton, and William F. Cole),
in EOS, Transactions, American Geophysical Union, 1994, Fall Meeting,
p. 682.
INSTABILITY OF AN ABANDONED QUARRY SLOPE: LESSONS
LEARNED FROM FRANCISCAN COMPLEX CHERT, SAN FRANCISCO, CALIFORNIA:
2002 (with Dale R. Marcum), in Program with Abstracts, Association
of Engineering Geologists, 2002, Annual Meeting, Page 89.
ROCKFALL HAZARD EVALUATION AT THE KERN INTAKE,
KERN CANYON PENSTOCK, KERN RIVER, SOUTH-CENTRAL CALIFORNIA: 2002
(with William D. Page, Dale R. Marcum and Joseph M Durdella), in
Program with Abstracts, Association of Engineering Geologists, 2003,
Annual Meeting, Page 70.
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