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Chicago Chapter Dinner Meeting
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When: October 18, 2016
5:15 pm Cocktails - 6:15 pm Dinner
Where: Rodity's
222 S Halsted St
Chicago, Illinois 
United States
Contact: Glenn Wittman

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Association of Environmental & Engineering Geologists
CHICAGO CHAPTER (Formerly North Central Section)
“Serving Professionals in Engineering, Environmental and Groundwater
Geology Since 1957”

October 2016 Dinner Meeting - Tuesday, October 18, 2016

LOCATION: Rodity's, 222 S. Halsted St., Chicago, IL (312) 454-0800

PROGRAM TOPIC: Origins of Early Landfill Studies in Illinois and Development of Low-Cost Monitoring of Closed Landfills by Remote Sensing

SPEAKER: Christopher Stohr, Engineering GeologistIllinois State Geological Survey

WHEN: Tuesday, October 18, 2016
Cocktails @ 5:15 pm
Dinner @ 6:15 pm
Presentation following dinner

$35 Members
$40 Non-Members
$15 Students and Professors

RSVP: Please RSVP by phone or email by 5 PM Monday, Oct 17, 2016 (224) 610-3531 (please leave message) or

TOPIC SYNOPSIS: Segregation of wastes from potable water resources is a foundation of modern sanitation and public health. Office and field studies of prospective landfills, as part of groundwater protection, rose from cooperative geologic mapping for land use and water supply in metropolitan Chicago in the 1960s. Early applied research at the ISGS provided timely hydrogeologic information using piezometers to measure groundwater mounding; water chemistry; soil chemistry and physics; field versus lab hydraulic conductivity; temperature, electrical earth resistivity, geophysical surveys to delimit leachate plumes; and remote sensing to identify defects and infiltration through earthen covers. The latter contributed to failure of a hazardous waste landfill which set new legal precedents. Periodic “walkover” inspections of landfills provide limited information about cover conditions. Field surveys might not find all defects in the cover because of time constraints and limited visibility of features. Rather than relying solely upon traverses to identify every serious defect, onsite inspections can be improved by interpreting aerial imagery to identify features of interest prior to field reconnaissance. Two sources of publicly available, digital, georeferenced, high-resolution, remote sensing imagery useful for postclosure monitoring are, 1)airborne lidar enhanced elevation data; and2)digital, orthorectified, color and near-infrared(VNIR) photography. Defects were manually identified on enhanced, multi-date imagery for several closed landfills to test the technique. Measurements and interpretations were incorporated into a GIS-based image service to make a defect tracking database. Initial results of field tests appear promising and additional refinements are being developed.

BIOGRAPHICAL SKETCH: Christopher Stohr is an engineering geologist specializing in remote sensing, image processing, photogrammetry, LiDAR, geophysics, 3D mapping, conventional and satellite surveying, natural hazards, and waste management at the Illinois State Geological Survey, Prairie Research Institute at the University of Illinois at Urbana-Champaign. BS St. Joseph's College, Rensselaer, IN; MS Purdue University/Laboratory for Applications of Remote Sensing; PhD University of Illinois at Urbana-Champaign; Professional Geologist, Certified Engineering Geologist

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