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Patrick F. Lehrmann,
RGP
Principal Geophysicist
EDUCATION
Bachelor of Science, Geology,
1995, University of Wisconsin, Oshkosh, Wisconsin
REGISTRATIONS AND CERTIFICATIONS
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Registered Geophysicist, California, RGP 1043
OSHA 40-Hour Health and Safety Training (with annual
updates)
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PROFESSIONAL EXPERIENCE AND
RESPONSIBILITIES
Mr. Lehrmann’s 8 years
of professional experience includes performing geophysical, geotechnical,
and environmental evaluations for municipal, commercial, industrial, and
military projects. As a Geophysicist, Mr. Lehrmann
manages and conducts geophysical field evaluations including seismic
refraction, ground penetrating radar, magnetic, electrical resistivity and electromagnetic studies; and prepares
and reviews reports documenting methodologies and findings, and presents
conclusions and recommendations. Mr. Lehrmann’s
recent project experience includes:
- Leo
Carrillo State Beach,
Malibu California: Geophysicist for the proposed
installation of a Geotube, intended to mitigate future erosion of site
improvements located along the State beach. Services provided
included the performance of seismic refraction surveys, electrical resistivity soundings, and ground penetrating
radar profiles in the area of the proposed Geotube;
data compilation; and preparation of a written report. The purpose
of the geophysical surveys was to characterize the subsurface
materials and to delineate the depth to competent materials.
- USEPA
Unexploded Ordnance Removal Site, Southern California: Geophysicist for survey services
and geophysical analysis for the evaluation of a 13-acre portion of
a suspected unexploded ordinance (UXO) property located within the
Inland Empire region of California. The U.S. Army used the subject
site and an additional 213 adjoining acres during World War II
(WWII) as a munitions storage and transfer facility. Following WWII, and from the
mid-1950s to about 1993, private industry used portions of the area
for the storage, manufacturing, assembling, and testing of a variety
of explosives and pyrotechnic materials (fireworks). Services
included conducting initial/reconnaissance level surveys using
highly sensitive hand held metal detectors to delineate any
surface/near surface UXO. Following the initial survey, a highly
detailed survey was conducted using EM 61 and a total field
magnetometer. Data were processed in the field. The results of the
survey uncovered several UXO which were later detonated by the San
Bernardino Bomb Squad.
- North Island Naval Air
Station Landfill Delineation Project, San Diego, California: Project Manager and field Geophysicist
reviewing background information and previous geophysical reports
for the target area; coordinating and supervising field operations;
and serving as primary author of the report presenting our
geophysical evaluation of former disposal pit sites. Environmental hazards identified
during our surveys included a relatively large pod of debris.
- City of Carlsbad
Municipal Facilities Expansion, Carlsbad, California:
Geophysicist
reviewing trench logs of the target site; managing field operations;
and serving as primary author of the report. He also performed seismic
refraction profiles to determine the thickness of unconsolidated
fill, engineered fill, and depth to bedrock. Seismic data combined with trench
log data confirmed the existence and limits of unconsolidated fill.
- Pacific Center
Building, San
Diego, California: Geophysicist
for a void detection survey below the Pacific Center
Building. The purpose of the evaluation was
to delineate the presence of voids resulting from an underground
fire water main rupture. The evaluation consisted of conducting ground penetrating radar (GPR) across the first floor of the
building. The results of this survey indicated the presence of voids
along the fire water main trench. Cores were performed which
validated the GPR results.
- Espola Road Widening, Poway,
California: Geophysicist reviewing geotechnical drilling
logs of the target site, performance of seismic refraction profiles
to evaluate rock rippability, and depth to
bedrock, and serving as primary author of the report. The purpose of the study was to
assess the geotechnical conditions underlying the project area and
indicate which areas would need blasting to achieve desirable
ripping rates.
- Holmes and Hawthorne
Elementary Schools,
Geophysical Surveys, San Diego, California: Geophysicist during the evaluation
of underground utilities at the Holmes and Hawthorne Elementary
Schools. Purpose of the study was to
create as-built drawings of underground utilities. Services included
performing ground penetrating radar (GPR), electromagnetic and
magnetic surveys in order to locate the presence of utilities.
- Rancho High
School Utility Evaluation, Las Vegas, Nevada:
Geophysicist during the
evaluation of underground utilities at the High School property.
Purpose of the study was to create as-built drawings of underground
utilities. Services included performing ground penetrating radar
(GPR), electromagnetic and magnetic surveys in order to locate the
presence of utilities.
- Squaw Valley Ski Resort Environmental Hazard Assessment,
Squaw Valley, California: Project
Manager and field Geophysicist reviewing air photos and phase one
reports for the target area; coordinating and supervising field
operations; and serving as primary author of the project
report. The purpose of the
study was to search the accessible portions of the site in an
attempt to determine if any underground storage tanks or foundation
remnants still exist in the subsurface. Hazards identified during the
surveys included a number of tanks associated with the skating rink
cooling process, as well as, numerous deadman
anchors for the former facilities super structure.
- Proposed Railroad Spur Addition Fort Irwin, California: Geophysicist reviewing geotechnical
drilling logs of the target site, performing seismic refraction
profiles to evaluate rock rippability, and
depth to bedrock,
and serving as primary author of the report. The purpose of the study was to
assess the geotechnical conditions underlying a proposed ten-mile
extension of the railroad spur, and indicate which areas would need
blasting to achieve desirable ripping rates.
- Corona Housing Development
Blast Monitoring, Corona,
California: Geophysicist
conducting seismic vibration monitoring to evaluate the
effect of ongoing blasting activities. The purpose of the monitoring
study was to assess the effects of blasting on existing structures
in the surrounding community.
- SR 51 Widening Vibration Monitoring, Phoenix, Arizona:
Project Manager and
field Geophysicist reviewing background information and previous
geophysical reports for the target area; coordinating and
supervising field operations.
The purpose of the study was to assess the effects of heavy
equipment use on existing structures in the surrounding community.
- Former
Gas Station Site, Orange
Boulevard, Pasadena, California: Geophysicist
evaluating the removal of an underground storage tank for a former
gas station. Services included conducting ground penetrating radar
(GPR), electromagnetic and magnetic surveys across the site. The use
of GPR was instrumental in delineating the former location of the
storage tank.
- USEPA Los Angeles Drum Recycling Facility, Los Angeles, California: Geophysicist for
a criminal investigation project. Services included conducting
ground penetrating radar (GPR), electromagnetic and magnetic surveys
to delineate unauthorized drum burial. Mr. Lehrmann
worked with the FBI in performing these services to locate these
drums at an existing facility.
PROFESSIONAL AFFILIATIONS
San Diego
Association of Geologists
FOREIGN
LANGUAGE
Indonesian
E-mail me at:
plehrmann@southwestgeophysics.com
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