Patrick Lehrmann, PG, PGP

Principal Geologist / Geophysicist


Bachelor of Science, Geology, 1995, University of Wisconsin, Oshkosh, Wisconsin


Professional Geophysicist, California, PGP 1043

Professional Geologist, California, PG 8058

OSHA 40-Hour Health and Safety Training (with annual updates)

Refinery Safety Overview (RSO)

Los Angeles Clean Card (LACC)


AutoCAD, EarthImager, MagMap, Microsoft Office, Pathfinder, Photoshop, Radan, ReMi, SeisOpt Pro, SIPwin, Surfer, SurfSeis


Mr. Lehrmann’s 16 years of professional experience includes performing geophysical, geotechnical, and environmental evaluations for municipal, commercial, industrial, and military projects. As a Principal 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 project experience includes:

  • Leo Carrillo State Beach, Malibu California:Principal 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.
  • Orange County Sanitation District, Plant 2, Huntington Beach, CA: Principal Geophysicist performing and overseeing geophysical services for the City Water Pump Station Standby Power project. Services included review of background documents, the detection of underground utilities/obstructions in the area of planned improvements, and coordination with survey crews. Several utilities lines were detected and mapped in areas where lines were not expected.
  • University of California, Irvine (UCI) On-Call Contract: Principal Geophysicist performing and overseeing geophysical services conducted for numerous projects at the UCI campus. Projects included the proposed Anteater Recreation Center, School of Business Building, Telemedicine Facility, and the Social and Behavioral Sciences Building. Services included review of background documents, the detection of underground utilities/obstructions in the area of planned improvements, and coordination with survey crews.
  • USEPA Unexploded Ordnance Removal Site, Southern California: Principal 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.
  • Proposed Railroad Spur Addition Fort Irwin, California: Principal Geophysicist reviewing geotechnical drilling logs of the target site; managing field operations; and serving as primary author of the report. He also performed seismic refraction profiles to evaluate rock rippability, and depth to bedrock. The purpose of our 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.


San Diego Association of Geologists