We hope you will join us for our third 2026 AEG Inland Empire meeting. The meeting will be held Wednesday, March 11, at the Old Spaghetti Factory, in Rancho Cucamonga. This is a “north” venue of our roving AEG-IE meeting locations. Looking forward to seeing you there!
UPCOMING MEETING NOTICE
*** Wednesday, March 11, 2026 ***
Download the Announcement 
| Topic: | Retrospective of the Earthline Hazardous-Waste Landfill Failure, a Case Study of Legacy Landfills and Dumps and Improving Field Inspections to Reduce Groundwater Contamination With Remarks about Geoscience in Politics |
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| Speaker: | Dr. Christopher (Chris) Stohr, PhD, PG, CEG 2025-2026 Richard H Jahns Distinguished Lecturer |
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| Date: | Wednesday, March 11, 2026 Social hour: 5:30 pm Dinner: 6:30 pm Presentation: 7:30 pm |
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| Location: | The Old Spaghetti Factory 11896 Foothill Blvd Rancho Cucamonga, CA 91730 |
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| Cost: | $45 per person with advance reservations for AEG members, $50 for non-AEG members, $50 for anyone without reservations (at the door), and $10 for students with a valid student ID and current AEG Student membership; the Student Membership is FREE, but it sometimes takes a few days to receive a student membership. |
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| Food: | Food from The Spaghetti Factory |
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| RSVP: | Registration has closed as of 12:00pm on March 9, 2026. With questions, please email meetings@aeg-ie.org. | Email AEG-IE at meetings@aeg-ie.org Please make reservations prior to 12:00pm on March 9, 2026. |
| Presentation Summary: | |
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Subject of a landmark, legal-precedent setting trial, an unlined, hazardous-waste landfill was said by experts ‘not to leak in 100 years’ however, contaminants were detected in monitoring wells 3 meters from the burial trenches only 3 years after closure. Field and lab tests, and remote sensing measurements showed causes for the ‘faster than predicted’ contaminant migration from a hazardous waste landfill, but why? Legacy landfills are unlined, thinly-covered cemeteries of waste similarly constructed throughout the world. Most landfill inspections mostly rely upon institutional memory and traditional ‘walk over’ traverses to identify flaws and deficiencies for written reports. These defects can be better identified and mapped by image processing of freely-available airborne lidar, historical black and white photography and modern color infrared orthoimagery using GIS technology to direct low-cost, spot repairs for maintenance and custodial care to reduce undesired contamination from legacy waste structures. |
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| Speaker Biography: | |
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Dr. Christopher ‘Chris’ Stohr (retired, Illinois State Geological Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign), Mahomet Aquifer Council, Illinois Board of Licensing for Professional Geologists, former Champaign County [IL] Board Member [3 terms], currently 2025-2026 Richard H. Jahns Distinguished Lecturer. Dr. Stohr is a professional geologist with more than 40 years of experience in applied geology, remote sensing, and environmental investigations across the United States, Africa, and South America. His career includes work with state geological surveys, international fault and nuclear facility studies, and extensive research on landslides, landfills, and remote sensing applications. Dr. Stohr is a Professional and Certified Engineering Geologist, a former Fulbright Senior Specialist, and an active member of AEG, GSA, and ASPRS. |
