Event Title

Use of Geological Approaches in Determining the Source, Transportation Pathways and Food Chain Impacts of Recent DDT Contamination in Squam Lake, NH

Faculty Sponsor(s)

Lisa Doner

Abstract

In 2017, high levels of DDT (exceeding levels of its metabolites) were detected in surface sediments for two inlets into Squam Lake, NH. My first objective is to identify DDT source area(s) by collecting sediment and soil samples in depositional areas of the lake, the streambed, slightly upstream of tributaries and the soils of surrounding banks, until I am able to identify the source(s). Another objective is to test the hypothesis that the release of the DDT is associated with an extreme weather event such as a flood that could have exposed and mobilized buried DDT-bearing sources. To test this, I will take a lake freeze core close to the inlet where DDT has been detected. I will date and analyze samples in the core for DDT to see if DDT is entering at the same time as extreme watershed erosion events. My final objective is to identify if new DDT has entered the food chain by analyzing benthic macroinvertebrates for DDT residues. Identifying these objectives will allow adequate measures to be taken to mitigate the DDT impacts on the lake, food chain, human health and recreational uses of the lake.

Location

Hartman Union Building Courtroom

Start Date

5-2-2019 4:00 PM

End Date

5-2-2019 5:00 PM

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May 2nd, 4:00 PM May 2nd, 5:00 PM

Use of Geological Approaches in Determining the Source, Transportation Pathways and Food Chain Impacts of Recent DDT Contamination in Squam Lake, NH

Hartman Union Building Courtroom

In 2017, high levels of DDT (exceeding levels of its metabolites) were detected in surface sediments for two inlets into Squam Lake, NH. My first objective is to identify DDT source area(s) by collecting sediment and soil samples in depositional areas of the lake, the streambed, slightly upstream of tributaries and the soils of surrounding banks, until I am able to identify the source(s). Another objective is to test the hypothesis that the release of the DDT is associated with an extreme weather event such as a flood that could have exposed and mobilized buried DDT-bearing sources. To test this, I will take a lake freeze core close to the inlet where DDT has been detected. I will date and analyze samples in the core for DDT to see if DDT is entering at the same time as extreme watershed erosion events. My final objective is to identify if new DDT has entered the food chain by analyzing benthic macroinvertebrates for DDT residues. Identifying these objectives will allow adequate measures to be taken to mitigate the DDT impacts on the lake, food chain, human health and recreational uses of the lake.