November 2025 SCGS Meeting

South Coast Geological Society invites you to attend our next meeting and lecture! Don Terres, President and Principal Geologist of Terrestrial Solutions, Inc., will present his lecture titled: Lake Isabella Reconstruction Project: Rock Quality Characterization using Blast Hole Penetration Rate Data (What does a DAM Geologist do?)

Abstract:

This talk will highlight the key activities that a geologist provides on a large dam re-construction project. The majority of the talk is about how a small group of geologist used drill penetration rates to model the site geology and predict the quality of rock to more effectively blast and develop the Emergency Spillway quarry at the Lake Isabella reconstruction project. Conclusion - You can use drill penetration rates to characterize the geologic conditions at a site.

Speaker Information:

Don received his BS in geological sciences from Principia College in Indiana. After completing graduate studies in geology at UC Santa Barbara, Don worked with Leighton and Associates, and later Pacific Soils Engineering, before starting Terrestrial Solutions in 2009. Overall, Don has more than 40 years experience in the field of engineering geology, including performing active/potentially active fault investigations, seismic hazard evaluations, groundwater characterization, landslide and slope stability studies, and geotechnical reporting for residential, commercial, and public works projects.

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Thank you to our individual and corporate sponsors whose generous donations help make these events sustainable! If you or your company would like to become a 2026 corporate sponsor, please contact [email protected].

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Dave and Busters

20 City Blvd West

Orange, CA

Member : $50

Non-Member: $60

Students: $20

2025 Membership dues can be paid here as a registration add-on: $40

6:00 PM - Check-in and social hour

6:30 PM - Dinner served

7:00 PM - Presentation begins after brief announcements

Please register by Friday, October 31. Walk-ins are accepted, but early registration helps ensure enough food is prepared.

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