Landslide Invenstigations la cresta geotechnicalLandslide Investigations

La Cresta Geotechnical, Inc. is a geotechnical engineering firm. We strive to provide our clients with excellent personalized service, in a timely cost effective manner. We work closely with our clients to solve geotechnical engineering related challenges, from the single-family project to the larger and more technically complex project. Mark Sweeney, owner and chief geologist, has well over 26 years experience working in the geotechnical engineering field. We look forward to working with you on your next project.

Mark Sweeney is a 1985 graduate of Humboldt State University, in Arcata, California, where he recieved his degree in Geology with an emphasis in Engineering. Famous now for its extensive programs and achievements in the geotechnical field, Humboldt State has a reputation for graduating students with integrity and professionalism in geological sciences.

La Cresta Geotech is proud to be a member in good standing with the San Diego Association of Geologists. La Cresta Geotech is also a member in good standing with both the Inland Geological Society and the American Society of Civil Engineers, Geotechnical Engineering Division.

Professional responsibilities of La Cresta Geotech include:

  • Conducting geotechnical evaluations, including logging and sampling of exploratory excavations.
  • Civil inspection of grading and construction project activities.
  • Installation and subsequent monitoring of geophysical and hydrological instrumentation.
  • Coordination of the activities of field and laboratory technicians.
  • Perform phase I and phase II geologic and property damage evaluations of distressed structures.
  • Perform geologic mapping and research.
  • Perform percolation testing and design septic systems, including alternative treatment systems.


Mark Sweeney has over 26 years of experience providing geotechnical services, including investigations and soil testing services during large hillside grading, streets and improvement projects to small single-family projects. Select projects Mark Sweeney has worked on include 1) Aviara, Carlsbad, California, 2) Eastlake Greens and The Woods, Chula Vista, California, and 3) Black Mountain Reservoir Project, San Diego, California.

  • Provide Civil Inspection for over four years during construction of the Diamond Valley
  • Reservoir, Hemet, California. Provided inspection during the embankment placement. Provided inspection of instrumentation installation and subsequent monitoring and interpretation of data. Oversight and inspection of drilling activities, including geologic logging of rock cores, construction of plastic concrete cut-off wall and blasting act ivies.
  • Performance and oversight of Caltrans test methods during soil, concrete and asphalt placement for the SR-91 Toll Road project in Orange County, California.
  • Geotechnical services performed during grading of the San Joaquin Hills Toll Corridor (SR-73) project, Orange County, California, including observation and testing during grading, cut and fill slope mapping and stability analysis, landslide analysis and remediation.
  • Performed phase I and phase II geologic and property damage evaluations of numerous structures in Los Angeles County, California, after the Northridge earthquake of 1994.
  • Performed percolation test studies and septic designs for numerous singe-family and large scale subdivisions as well as commercial projects in San Diego and Riverside Counties, California.

For a more complete discussion of our full geotechnical engineering services, please phone or email us.

Member ASCE

La Cresta Geotechnical Performs Geotechnical Services and Percolation Testing in the following cities within Riverside County, California:

Temecula, Murrieta, Winchester, - Perris, Lake Elsinore, Hemet, Palm Desert, Palm Springs, Nuevo, San Jacinto, Riverside, Lake Mathews, Mira Loma, Norco, Indio, Corona, Cherry Valley, Homeland, Romoland, Sage, Twin Pines, Idyllwild, Beaumont, Banning, Menifee, Sun City, Desert Hot Springs, Running Springs, Yucaipa, Colton, Crestline, San Bernardino County - San Bernardino, Ontario, Big Bear, Fontana, Colton, Moreno Valley, Redlands, Victorville, Highland, Apple Valley, Hesperia, Upland, Rancho Cucamonga, Yucca Valley and more. Also serving and San Diego County, Carlsbad, Oceanside, Escondido, lakeside, Bonsall,