This data release documents chemical analyses of environmental samples collected by the U.S. Geological Survey (USGS) in Lakeport (Lake County, California) during July 11-12, 2022. Environmental samples were collected at selected sites to assess the effects of lead-based paint on soil chemistry. This sampling was made as part of a broader study to attribute sources of lead in soils in cooperation with the California Department of Toxic Substances Control (DTSC) for their Lead-Acid Battery Recycling Facility Investigation and Cleanup (LABRIC) program. Results of soil sampling and chemical analyses are included in the data-release component entitled "Soils chemistry from selected sites in Lakeport, Lake County, California" linked below. Results of paint-chip screening data and associated quality control are included in the data-release component entitled "Field portable X-ray fluorescence and associated quality-control data for paint chips sampled from selected sites in Lakeport, Lake County, California" linked below. This study would not have been possible without volunteers who provided field support and allowed access to sample sites. First release: July, 2023 Revision 1.1: August, 2023

This data release documents chemical analyses of environmental samples collected by the U.S. Geological Survey (USGS) in Lakeport (Lake County, California) during July 11-12, 2022. Environmental samples were collected at selected sites to assess the effects of lead-based paint on soil chemistry. This sampling was made as part of a broader study to attribute sources of lead in soils in cooperation with the California Department of Toxic Substances Control (DTSC) for their Lead-Acid Battery Recycling Facility Investigation and Cleanup (LABRIC) program. Results of soil sampling and chemical analyses are included in the data-release component entitled "Soils chemistry from selected sites in Lakeport, Lake County, California" linked below. Results of paint-chip screening data and associated quality control are included in the data-release component entitled "Field portable X-ray fluorescence and associated quality-control data for paint chips sampled from selected sites in Lakeport, Lake County, California" linked below. This study would not have been possible without volunteers who provided field support and allowed access to sample sites. First release: July, 2023 Revision 1.1: August, 2023

This data-release component documents chemical analyses of soil samples collected by the U.S. Geological Survey (USGS) in Lakeport (Lake County, California) on July 12, 2022. Environmental samples were collected at selected sites in Lakeport to assess the effects of lead-based paint on soil chemistry. This sampling was made as part of a broader study to attribute sources of lead in soils in cooperation with the California Department of Toxic Substances Control (DTSC) for their Lead-Acid Battery Recycling Facility Investigation and Cleanup (LABRIC) program. A total of five soil samples plus one replicate across four properties were collected proximal to selected structures suspected to have legacy coatings of lead-based paint. This component of the data release contains two tab-delimited text files and associated metadata describing results. The Lakeport_soils.txt file contains results of soil chemical analyses for individual soil samples sieved to three size fractions (less than 2 millimeters [mm], 0.063 mm to 0.25 mm, and less than 0.063 mm). Concentrations of elements included in this data release analyzed by inductively coupled plasma mass spectrometry or optical-emission spectrometry after multi-acid digestion include: aluminum, calcium, iron, potassium, magnesium, sodium, sulfur, titanium, silver, arsenic, barium, beryllium, bismuth, cadmium, cerium, cobalt, cesium, copper, gallium, indium, lithium, manganese, molybdenum, niobium, nickel, phosphorus, lead, rubidium, antimony, scandium, selenium, tin, strontium, tantalum, tellurium, thorium, thallium, uranium, vanadium, tungsten, and zinc. The Lakeport_soils_replicates.txt file contains comparison results for the aforementioned three size fractions for one of the soils that was sampled in duplicate.

This data-release component documents chemical analyses of soil samples collected by the U.S. Geological Survey (USGS) in Lakeport (Lake County, California) on July 12, 2022. Environmental samples were collected at selected sites in Lakeport to assess the effects of lead-based paint on soil chemistry. This sampling was made as part of a broader study to attribute sources of lead in soils in cooperation with the California Department of Toxic Substances Control (DTSC) for their Lead-Acid Battery Recycling Facility Investigation and Cleanup (LABRIC) program. A total of five soil samples plus one replicate across four properties were collected proximal to selected structures suspected to have legacy coatings of lead-based paint. This component of the data release contains two tab-delimited text files and associated metadata describing results. The Lakeport_soils.txt file contains results of soil chemical analyses for individual soil samples sieved to three size fractions (less than 2 millimeters [mm], 0.063 mm to 0.25 mm, and less than 0.063 mm). Concentrations of elements included in this data release analyzed by inductively coupled plasma mass spectrometry or optical-emission spectrometry after multi-acid digestion include: aluminum, calcium, iron, potassium, magnesium, sodium, sulfur, titanium, silver, arsenic, barium, beryllium, bismuth, cadmium, cerium, cobalt, cesium, copper, gallium, indium, lithium, manganese, molybdenum, niobium, nickel, phosphorus, lead, rubidium, antimony, scandium, selenium, tin, strontium, tantalum, tellurium, thorium, thallium, uranium, vanadium, tungsten, and zinc. The Lakeport_soils_replicates.txt file contains comparison results for the aforementioned three size fractions for one of the soils that was sampled in duplicate.

The data herein were collected in support of a larger study in Gwinnett County, Georgia, on the potential impacts of on-site waste water treatment (septic systems) on Lake Lanier water quality. Until recently, a missing component in this assessment was the inclusion of historical sediment and associated nutrient accumulation data from the lake to place results in a broader context. To this end, the USGS collected sediment cores from ten locations that varied in water depth as well as proximity to residential areas with septic systems. Samples were collected using either a gravity corer or box corer depending on site conditions. Cores were sub-sampled and processed for laboratory analyses. Laboratory analyses were conducted to evaluate nutrient concentrations (carbon, nitrogen, and phosphorus) in sediments, stable isotope ratios of carbon and nitrogen in the sediment organic matter, cesium-137 for select samples, and trace and heavy metals. The latter constituents (cesium-137 and trace and heavy metals) were used primarily to help constrain mass accumulations rates (MAR) and assign ages to each sub-sample so that temporal changes in nutrient concentrations could be evaluated in concert with timing of shoreline development. Version 2.0 adds three new data files: 1) information linking specific replicate sediment cores to specific laboratory analyses, 2) activities of five radioisotopes (cesium-137, lead-210, radium-226, thorium-234, and potassium-40), and 3) the concentration of biogenic silica of sediment samples from all 10 coring sites. This revision also corrects a shift in the latitude and longitude of the coring sites.

The data herein were collected in support of a larger study in Gwinnett County, Georgia, on the potential impacts of on-site waste water treatment (septic systems) on Lake Lanier water quality. Until recently, a missing component in this assessment was the inclusion of historical sediment and associated nutrient accumulation data from the lake to place results in a broader context. To this end, the USGS collected sediment cores from ten locations that varied in water depth as well as proximity to residential areas with septic systems. Samples were collected using either a gravity corer or box corer depending on site conditions. Cores were sub-sampled and processed for laboratory analyses. Laboratory analyses were conducted to evaluate nutrient concentrations (carbon, nitrogen, and phosphorus) in sediments, stable isotope ratios of carbon and nitrogen in the sediment organic matter, cesium-137 for select samples, and trace and heavy metals. The latter constituents (cesium-137 and trace and heavy metals) were used primarily to help constrain mass accumulations rates (MAR) and assign ages to each sub-sample so that temporal changes in nutrient concentrations could be evaluated in concert with timing of shoreline development. Version 2.0 adds three new data files: 1) information linking specific replicate sediment cores to specific laboratory analyses, 2) activities of five radioisotopes (cesium-137, lead-210, radium-226, thorium-234, and potassium-40), and 3) the concentration of biogenic silica of sediment samples from all 10 coring sites. This revision also corrects a shift in the latitude and longitude of the coring sites.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from Milford Lake, Kansas, on May 26, June 9, July 14, July 21, and September 15, 2016. All data are reported as raw measured values and are not rounded to USGS significant figures. Continuous water-quality monitors were used to measure water temperature, specific conductance, turbidity, pH, chlorophyll, phycocyanin, dissolved oxygen, and fluorescent dissolved organic matter (fDOM) at thirty-second intervals at depths of 0.5- and 1.5-meters throughout the lake.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from Milford Lake, Kansas, on May 26, June 9, July 14, July 21, and September 15, 2016. All data are reported as raw measured values and are not rounded to USGS significant figures. Continuous water-quality monitors were used to measure water temperature, specific conductance, turbidity, pH, chlorophyll, phycocyanin, dissolved oxygen, and fluorescent dissolved organic matter (fDOM) at thirty-second intervals at depths of 0.5- and 1.5-meters throughout the lake.

This data release supports the following publication: Hittle, Elizabeth, 2017, Longshore water-current velocity and the potential for transport of contaminants: A pilot study in Lake Erie from Walnut Creek to Presque Isle State Park beaches, Erie, Pennsylvania, June and August 2015: U.S. Geological Survey Open-File Report 2016–1206 126 p., https://doi.org/10.3133/ofr20161206 Water-quality grab samples were collected about a meter from shore and coincide with the 25 longshore water-current velocity transects as closely as conditions would allow. Nearshore water-quality grab samples were collected on June 24, August 11, and August 19, 2015. Samples were analyzed for bacteria concentration, temperature, specific condictivity, pH, turbidity, and suspended sediment concentration. Not all parameters were analyzed for every sample. Samples were collected by Erie County Department of Health (ECDH) employees and Regional Science Consortium (RSC) interns. The nearshore water-quality samples were collected using grab-sample techniques. To maintain sterile conditions, grab samples were collected in at least 1 meter of water at approximately 0.3 meters below the water surface, being careful not to stir up bottom sediments. Water samples for bacteria analysis were collected in pre-sterilized 500-mL polypropylene bottles, allowing about 2 inches of head space for proper mixing, and were kept on ice prior to processing. Bacteria samples were analyzed for Escherichia coli (E. coli) using modified mTEC membrane-filtration techniques and were processed by RSC staff in the RSC laboratory within 6 hours of sample collection. Water samples for sediment analysis (June 24 and August 11, 2015) were collected in pre-tared 1000-mL polypropylene bottles by tilting the bottle at about a 45 degree angle away from the sampler and moving it from just under the surface (where the bottle was uncapped) to just above the streambed and back in a smooth vertical motion to get as close to a depth-integrated, single-vertical grab sample as possible. Sediment samples were prepared for shipping and sent to the USGS sediment laboratory at the USGS Kentucky Water Science Center where they were analyzed for total suspended sediment concentration, sand/fine break (percent of sediment less than 4 mm), and fine components including percent fines less than 2 mm, 1 mm, 0.5 mm, 0.25 mm, 0.125 mm, and silt/clay break at <0.0625mm.

This data release supports the following publication: Hittle, Elizabeth, 2017, Longshore water-current velocity and the potential for transport of contaminants: A pilot study in Lake Erie from Walnut Creek to Presque Isle State Park beaches, Erie, Pennsylvania, June and August 2015: U.S. Geological Survey Open-File Report 2016–1206 126 p., https://doi.org/10.3133/ofr20161206 Water-quality grab samples were collected about a meter from shore and coincide with the 25 longshore water-current velocity transects as closely as conditions would allow. Nearshore water-quality grab samples were collected on June 24, August 11, and August 19, 2015. Samples were analyzed for bacteria concentration, temperature, specific condictivity, pH, turbidity, and suspended sediment concentration. Not all parameters were analyzed for every sample. Samples were collected by Erie County Department of Health (ECDH) employees and Regional Science Consortium (RSC) interns. The nearshore water-quality samples were collected using grab-sample techniques. To maintain sterile conditions, grab samples were collected in at least 1 meter of water at approximately 0.3 meters below the water surface, being careful not to stir up bottom sediments. Water samples for bacteria analysis were collected in pre-sterilized 500-mL polypropylene bottles, allowing about 2 inches of head space for proper mixing, and were kept on ice prior to processing. Bacteria samples were analyzed for Escherichia coli (E. coli) using modified mTEC membrane-filtration techniques and were processed by RSC staff in the RSC laboratory within 6 hours of sample collection. Water samples for sediment analysis (June 24 and August 11, 2015) were collected in pre-tared 1000-mL polypropylene bottles by tilting the bottle at about a 45 degree angle away from the sampler and moving it from just under the surface (where the bottle was uncapped) to just above the streambed and back in a smooth vertical motion to get as close to a depth-integrated, single-vertical grab sample as possible. Sediment samples were prepared for shipping and sent to the USGS sediment laboratory at the USGS Kentucky Water Science Center where they were analyzed for total suspended sediment concentration, sand/fine break (percent of sediment less than 4 mm), and fine components including percent fines less than 2 mm, 1 mm, 0.5 mm, 0.25 mm, 0.125 mm, and silt/clay break at <0.0625mm.