Meeting/Event Information

Technical Talks: The Minnesota Section of AIPG holds technical talks September through May, generally the first Tuesday of the month. The talks are designed to fulfill 1 Professional Development Hour (PDH). Professional Geologists, as licensed in the State of Minnesota, are required to complete 24 PDHs every biennium licensing period, including 2 PDHs of ethics.  The technical talks feature important subjects of interest to professional geologists.

The cost includes a buffet lunch and is $21 for non-members, $16 for members, and $0 for students when registering in advance.  We have limited same-day registration for $25. 

As always, non-members and non-geologists are welcome to attend!

Antea Group International

AIPG MN Jan Meeting - Drinking Water Quality Across the Glacial Aquifer System!

January 07, 2020
11:30 AM - 1:00 PM

DoubleTree by Hilton Roseville
2540 North Clevelenad Avenue
Roseville, MN 55113

Registration for the AIPG MN Section's January meeting is now open online! The cost is $21 for non-members and $16 for members when registering before Monday, January 6, 2020 at 11:00 AM. Students may attend free of charge by registering in advance.  Same day registration is $25.  As always, non-members and non-geologists are welcome to attend!   



Drinking Water Quality Across the Glacial Aquifer System, Northern US: Measured and Modeled Concentrations of Arsenic and Manganese!

by Dr. Mindy Erickson, United States Geological Survey


Presentation Abstract

Groundwater contamination can limit its use as a drinking-water supply. Recent national-scale groundwater monitoring by the USGS National Water Quality Assessment Project (NAWQA) indicates that geologic-sourced contaminants such as arsenic and manganese occur more frequently at high concentrations (exceeding their human-health benchmarks) compared to anthropogenic contaminants such as pesticides or volatile organic compounds. Arsenic and manganese in drinking-water supplies can be detrimental to human health due to carcinogenic risk and adverse neurological effects. Machine learning methods in the form of ensemble decision trees (boosted regression trees) are being used by NAWQA teams to map predicted high concentrations of arsenic and manganese, and geochemical drivers (redox conditions and pH) in important US drinking water aquifers.

Groundwater withdrawals from the glacial (GLAC) aquifer system, northern US, serve about 30 million people and account for about 5% of water supply in the US. High concentrations (above a benchmark) of trace elements are widespread, across 28% of the study area, with an estimated 5.7 million people rely on groundwater with high concentrations of a trace element (manganese and arsenic are most commonly found at high concentrations). Conversely, nitrate concentrations are high in 4.0% and organic compounds (including pesticides and volatile organic compounds) high in 2.0% of the assessed study area.

Boosted regression tree models allow evaluation of the relative importance of predictor variables, and they describe relations between predictor variables and high arsenic or manganese concentrations. In the GLAC, the most influential predictors of high arsenic include likelihood of anoxic groundwater conditions, pH, and hydrologic position. The most influential predictors of high manganese include the likelihood of anoxic groundwater conditions, precipitation, hydrologic position, well depth, and pH. Model results demonstrate that these new tools help identify areas at greater risk for exceedances of health standards and better inform drinking water regulators, public health professionals, water suppliers and well owners.



Dr. Melinda (Mindy) Erickson is a research hydrologist in the USGS Upper Midwest Water Science Center - Minnesota office. She is also an adjunct associate professor at the University of Minnesota. Prior to joining USGS in 2009, Dr. Erickson worked for a local environmental consulting company and in several Minnesota state agencies. She has BS and MS degrees in Geological/Civil Engineering, and a PhD in Water Resources Science, all from the University of Minnesota. Her primary research interest is the occurrence, geochemistry, fate, and transport of geogenic constituents (e.g., arsenic, iron, manganese) in groundwater in glacial and bedrock aquifer systems.


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$21.00 Non-Member

$0.00 Student


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