EMERITUS
Email:
dbkent@usgs.gov
Office Phone:
650-329-4461
ORCID:
0000-0003-3758-8322
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a) Developing defensible conceptual models of processes influencing the mass transfer of inorganic contaminants between aqueous and solid phases. b) Translating conceptual models into quantitative models that can be used to predict the influence of mass-transfer processes on contaminant fate and transport in field applications. c) Developing approaches to obtain parameters required to describe contaminant mass transfer in quantitative fate and transport models that are, to the maximum extent possible, independent of field observations. d) Testing these approaches in laboratory experimental studies, field experimental studies, and field-scale plume characterization studies.
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This data release presents results from a laboratory study designed to measure the effect of temperature on denitrification rates in sediments collected from 5- to 30-cm depth below the lake bottom, at a location where groundwater discharges to the lake. Sediment cores were collected June 25, 2014 from the West site (Fishermans Cove) in Ashumet Pond, Cape Cod, MA then shipped to Boulder, CO for laboratory experiments. Groundwater used for these experiments was collected from a well just upgradient of the sediment collection site. Denitrification rates were determined on sediment plus groundwater slurries maintained under anaerobic conditions and employing the acetylene block method. Nitrous oxide concentrations...
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The U.S. Geological Survey Toxic Substances Hydrology Program at Cape Cod has been investigating the fate and transport of a treated-wastewater, groundwater contaminant plume. A portion of the contaminated groundwater discharges into Ashumet Pond, a kettle hole, freshwater lake. A study was conducted from June 2013 to June 2015 to document transport, transformation, and discharge of dissolved inorganic nitrogen species (DIN; nitrate, nitrite, and nitrous oxide) from the contaminant plume to the lake, across the groundwater-surface water interface. As part of that study, in October 2014, two natural gradient tracer tests were conducted within the lake bed sediments using nitrite as a reactive tracer and bromide as...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Ashumet Pond,
Denitrification,
Environmental Health,
Geochemistry,
Groundwater-surface water interaction, All tags...
Hydrogeology,
Lakes,
Nitrate,
USGS Science Data Catalog (SDC),
Water Quality, Fewer tags
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These metadata sets present the comprehensive geochemical composition of solid and water samples from the site of a 11.4ML (million liters) wastewater spill discovered in January, 2015. Analyses of a pipeline sample (analyses of select analytes), supplied by the North Dakota Department of Health are also included. The spill was near Blacktail Creek, north of Williston, ND. The leak was from a pipeline located approximately 70m from Blacktail Creek. The creek flows 17km before entering the Little Muddy River, a tributary to the Missouri River. The study included samples collected in waters upstream and downstream from Blacktail Creek in February and June 2015, June 2016, and June 2017. These data sets include field...
Categories: Data;
Tags: Bakken,
Blacktail Creek,
Little Muddy,
NVDOC,
North Dakota, All tags...
USGS Science Data Catalog (SDC),
Williams,
Williston Basin,
ammonium,
anions,
barium,
brine spills,
cations,
chemical analysis,
chromatography,
environment,
geochemistry,
major ions,
none,
nutrient content (water),
oxygen content (water),
oxygen isotope analysis,
radium,
radium isotopes,
salinity,
semi-volatile hydrocarbons,
strontium,
strontium isotopes,
surface water quality,
trace elements,
unconventional oil and gas production,
water pH,
water properties,
water temperature, Fewer tags
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This U.S. Geological Survey (USGS) data release provides a comprehensive dataset of water-quality results, physical-parameter measurements, hydrologic measurements, and site information collected to study the nature and extent of water quality along groundwater flow paths adjacent to glacial-kettle lakes on Cape Cod, Massachusetts. Water-quality samples were collected in 2003, 2005, and 2012 through 2018 in and near seven kettle lakes located on western Cape Cod, with most of the data collected in 2015-2017 from Ashumet Pond, which is located in the towns of Falmouth and Mashpee. Data were also collected at other lakes to compare the lake-specific influences of geochemistry and hydrology on the downgradient groundwater...
Categories: Data;
Tags: Ashumet Pond,
Bourne,
Cape Cod,
Centerville,
Ecology, All tags...
Falmouth,
Geochemistry,
Hydrogeology,
Long Pond,
Lovells Pond,
Mashpee,
Massachusetts,
Sandwich,
Santuit Pond,
Shubael Pond,
Snake Pond,
USGS Science Data Catalog (SDC),
Water Quality,
eutrophication,
groundwater,
groundwater and surface-water interaction,
groundwater flow,
groundwater quality,
hydrogeology,
lake ecosystems,
lake-bed characteristics,
limnology,
microbiology,
nutrient content (water),
nutrient cycling,
oxygen content (water),
reaction transport,
water chemistry,
water quality,
water sampling, Fewer tags
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