Meeting/Event Information

Minnesota Section of AIPG September Luncheon

September 03, 2013
11:45 AM to 1:00 PM
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Radisson Hotel Roseville
2540 North Cleveland Avenue
Roseville, MN 55113

Please email our Communications Director, Mary Sitko, by 10am, Thursday August 29th if you plan on attending

An accurate head count saves the chapter money. 

Cost is $20 for non-members and $15 for members.

September's meeting will be sponsored by American Engineering Testing, Inc.

Presentation Abstact

Approximately 78 percent of Minnesota’s population uses groundwater as drinking water. It is, therefore, critical to understand the quality and vulnerability of Minnesota groundwater to anthropogenic contamination. This study was designed to determine the occurrence of contaminants of emerging concern (CEC) in shallow groundwater in urbanized areas of Minnesota. CEC are chemicals that are not commonly monitored or regulated in the environment. Examples of CEC chemical classes include prescription and over-the-counter pharmaceuticals, fire retardants, pesticides, personal care products, hormones, and detergents.

From 2009 to 2012, water samples were collected from 118 wells screened in vulnerable sand and gravel or Prairie du Chien-Jordan aquifers. The water samples were analyzed for steroidal hormones, human-use pharmaceutical compounds, human and animal-use antibiotic compounds, and a broad suite of organic compounds typically found in wastewater. Preliminary results show that during this study, 23 distinct chemicals (out of 125 CEC analyzed) were detected among all water samples collected. The number CEC detected in individual water samples ranged from 0 to 8, and approximately 25% of samples had at least one CEC detected. 

The antibiotic sulfamethoxazole was the most frequently detected CEC. Other CEC detected in more than one sample include sulfadiazine, azithromycin, lincomycin, sulfamethazine, carbamazepine, and diphenhydramine (human and animal-use pharmaceuticals); camphor (flavor, fragrance); 4-cumylphenol (nonionic detergent metabolite); metolachlor and carbazole, (pesticide active ingredients); FYROL CEF (plasticizer and flame retardant); bisphenol A (plastic and resin component); tributyl phosphate (corrosion inhibitor); and isopropylbenzene (fuel and paint thinner component). Bisphenol A was detected at the highest concentration of any CEC. Developed land use settings had significantly more CEC detections than undeveloped areas, such as forests and parkland. The greater frequency of detection in wells located in developed land use settings indicate that domestic, commercial, industrial, or agricultural wastewater is likely a source of some of the CEC. All detections in this study were below health-based water quality standards, but 80 percent of the CEC analyzed do not have health-based water quality standards and thus could not be compared to a standard.

Speaker Biographies

Dr. Mindy Erickson is the groundwater specialist in the Minnesota Water Science Center of the U. S. Geological Survey and a faculty member of the University of Minnesota. She has been working in the hydrogeology field since 1993.  She started in consulting and then moved into groundwater-related research in 1998, first in state government with the Minnesota Department of Health and the Minnesota Pollution Control Agency, and since 2009 in the federal government with USGS.  Dr. Erickson’s primary research interests are the geochemistry, fate, and transport of organic chemicals and metals in groundwater.

Sharon Kroening is a research scientist at the Minnesota Pollution Control Agency. She has worked in the environmental sciences since 1994. From 1994 to 2007, Ms. Kroening worked for the U.S. Geological Survey, both in the Minnesota and Florida Water Science Centers, on surface and groundwater quality investigations. She has worked for the Minnesota Pollution Control Agency since 2007 and leads the agency’s ambient groundwater quality monitoring.