This metadata record contains 15 tables with results from field and laboratory tests used to assess bioremediation in wetland areas at the Standard Chlorine of Delaware, Inc. Superfund site, New Castle County, Delaware, during 2019-2021. Included in the dataset are (1) polychlorinated biphenyl (PCB) concentrations in wetland sediment from sediment microcosm laboratory experiments, (2) chlorobenzene concentrations in wetland sediment from sediment microcosm laboratory experiments, (3) polychlorinated biphenyl concentrations from PCB microcosm laboratory experiments using polyethylene strips, (4) chlorobenzene concentrations from PCB microcosm laboratory experiments using polyethylene strips, (5) total iron and ferrous iron concentrations from compost microcosm laboratory experiments, (6) methane (aqueous phase) concentrations from compost microcosm laboratory experiments, (7) volatile organic compound concentrations from compost microcosm laboratory experiments, (8) methane concentrations from polyethylene passive diffusion bag samplers collected during field sampling in the wetland area, (9) volatile organic compound concentrations from polyethylene passive diffusion bag samplers from field sampling, (10) chlorobenzene concentrations in water from field sampling using low density polyethylene sheet passive samplers, (11) polychlorinated biphenyl concentrations in water from field sampling using low density polyethylene sheet passive samplers in the wetland study area, (12) volatile organic compound concentrations for water samples collected from compost microcosm experiments with and without granular activated carbon, (13) volatile organic compound concentrations in sediment, extracted from methanol aliquots collected from compost microcosm experiments with and without granular activated carbon, (14) total iron concentrations for samples collected from compost microcosm experiments with and without granular activated carbon, and (15) methane (aqueous phase) concentrations for samples collected from compost microcosm experiments with and without granular activated carbon.

This dataset presents analytical results for laboratory and field tests conducted during 2015–19 as part of a bioremediation study in the wetland study area at Standard Chlorine of Delaware, Inc. Superfund site. Included in the dataset are (1) volatile organic compound and metal concentrations from field sampling in the wetland area, (2) results from in situ microcosms in the reactive barriers and control areas, and (3) volatile organic compound concentrations from laboratory experiments to test reactive mixtures for a barrier.

This dataset presents analytical results for laboratory and field tests conducted during 2015–19 as part of a bioremediation study in the wetland study area at Standard Chlorine of Delaware, Inc. Superfund site. Included in the dataset are (1) volatile organic compound and metal concentrations from field sampling in the wetland area, (2) results from in situ microcosms in the reactive barriers and control areas, and (3) volatile organic compound concentrations from laboratory experiments to test reactive mixtures for a barrier.

This metadata record contains 14 tables of biogeochemical data collected to evaluate the fate and transport of chlorinated ethenes in Area B groundwater, Fort Detrick, Frederick, Maryland collected during 2018-2020. Included in the dataset are (1) FtD_All_Constituents_NA_2019: concentrations of all non-VOC constituents analyzed as part of the natural attenuation sampling event in 2019, (2) FtD_All_Constituents_NA_2020: concentrations of all non-VOC constituents analyzed as part of the natural attenuation sampling event in 2020, (3) FtD_All_Constituents_PW_2019: concentrations of all non-VOC constituents analyzed as part of the porewater-surface water sampling event in 2019, (4) FtD_All_Constituents_PW_2020: concentrations of all non-VOC constituents analyzed as part of the porewater-surface water sampling event in 2020, (5) FtD_Concentrations_in_Rock_Matrix_VOC_2020: calculated concentrations of VOCs detected in rock matrix cores, extracted in 2020, (6) FtD_ISM_QuantArray_2020: abundance of microbial communities analyzed as part of the in situ microcosm event in 2020, (7) FtD_ISM_VOC_2020: concentrations of VOCs from the in situ microcosm event in 2020, (8) FtD_ISM_Redox_2020: concentrations of oxidation-reduction (redox) constituents from the in situ microcosm event in 2020, (9) FtD_MeOH_Extract_VOC_2020: concentrations of VOCs in methanol extracts of rock cores, extracted in 2020, (10) FtD_NA_VOC_2019: concentrations of VOCs analyzed as part of the natural attenuation sampling event in 2019, (11) FtD_NA_VOC_2020: concentrations of VOCs analyzed as part of the natural attenuation sampling event in 2020, (12) FtD_PW_VOC_2019: concentrations of VOCs analyzed as part of the porewater-surface water sampling event in 2019, (13) FtD_PW_VOC_2020: concentrations of VOCs analyzed as part of the porewater-surface water sampling event in 2020, and (14) FtD_USGS_Laboratory_evaluation_samples_VOC_2020: concentrations of VOCs analyzed as part of laboratory comparison in 2020.

This metadata record consists of 3 tables containing per-and-poly-fluoroalkyl substances (PFAS) and polychlorinated biphenyls (PCB) concentration data of wastewater and biosolid samples from wastewater treatment plants within the Patapsco and Potomac watersheds. The PCB concentration data was used to assess the occurrence and fate of PCB in wastewater treatment plants within the Patapsco watershed, from December 2021 to December 2022; The PFAS concentration data was used to assess the occurrence and fate of PFAS within the Patapsco and Potomac watersheds, from 2021-2023. The PFAS total oxidizable precursors (TOP) assay data were used to investigate PFAS fate in the wastewater treatment process of plants within the Patapsco watershed from March and September of 2022.

This metadata record contains 6 tables used to assess sources of Polychlorinated Biphenyls (PCB) in the Back River watershed, Baltimore City, Maryland. Included in the dataset are PCB concentrations of surface water and porewater passive samplers from Herring Run, Moores Run, tidal Back River, and Back River Wastewater Treatment Plant; PCB concentrations of bed sediments and other solids, Fat, Oil, and Grease (FOG) samples, and road sediments; dissolved organic carbon (DOC), total suspended solids (TSS), and particulate organic carbon (POC) concentrations of grab samples; and PCB concentrations of passive samplers from pump stations collected in 2018-2020.

This metadata record contains 6 tables used to assess sources of Polychlorinated Biphenyls (PCB) in the Back River watershed, Baltimore City, Maryland. Included in the dataset are PCB concentrations of surface water and porewater passive samplers from Herring Run, Moores Run, tidal Back River, and Back River Wastewater Treatment Plant; PCB concentrations of bed sediments and other solids, Fat, Oil, and Grease (FOG) samples, and road sediments; dissolved organic carbon (DOC), total suspended solids (TSS), and particulate organic carbon (POC) concentrations of grab samples; and PCB concentrations of passive samplers from pump stations collected in 2018-2020.

This metadata record consists of 16 tables containing data generated from laboratory experiments of trichloroethene (TCE) biodegradation and during field characterization and performance monitoring of a groundwater bioremediation pilot test conducted at Site K, Former Twin Cities Army Ammunition Plant, Arden Hills, Minnesota. The data were collected from December 2020 through December 2022. Laboratory experiment data include concentrations of volatile organic compounds (VOCs) and dissolved hydrocarbon gases including methane and ethene. Laboratory experiments were used to determine amendments for the groundwater bioremediation pilot test. Field data include concentrations of VOCs in soil core samples, information on wells used for the study, groundwater measurements of field parameters, and groundwater concentrations of VOCs, major and minor ions, nutrients, trace metals, non-volatile dissolved organic carbon (NVDOC), dissolved hydrocarbon gases, and redox-sensitive species including sulfide, reduced manganese, ferrous iron, and methane. Microbial communities in samples and compound specific isotope analysis of groundwater samples were also assessed. Groundwater and soil data were collected for initial site characterization from December 2020 to June 2021 and from October 2021 to December 2022 to establish baseline conditions before addition of pilot test amendments, followed by approximately quarterly and monthly sampling events for performance monitoring of the pilot test. The data within these tables were used to assess natural and enhanced anaerobic biodegradation of TCE and other VOCs and the potential to utilize bioremediation as a treatment method for the groundwater plume at Site K.

Data release including concentrations of bioactive organic contaminants in water and sediment and biodegradation rates of select model contaminants in sediment from Congaree National Park during 2013-15. Chemical analyses for targeted organic analytes include, human-use pharmaceuticals, degradates and metabolites and hormones and organic wastewater indicator compounds. Samples were collected between May 2013 and May 2015. Data release is associated with journal Article entitled, "Widespread Occurrence and the Potential for Biodegradation of Bioactive Contaminants in Protected Wilderness at Congaree National Park, USA", Environmental Toxicology and Chemistry. 2017. https://doi.org/10.1002/etc.3873 by Bradley, P.M., W.A. Battaglin, J.M. Clark, F.P. Henning, M.L. Hladik, L.R. Iwanowicz, C.A. Journey, J. Riley, and K.M. Romanok.

Data release including concentrations of bioactive organic contaminants in water and sediment and biodegradation rates of select model contaminants in sediment from Congaree National Park during 2013-15. Chemical analyses for targeted organic analytes include, human-use pharmaceuticals, degradates and metabolites and hormones and organic wastewater indicator compounds. Samples were collected between May 2013 and May 2015. Data release is associated with journal Article entitled, "Widespread Occurrence and the Potential for Biodegradation of Bioactive Contaminants in Protected Wilderness at Congaree National Park, USA", Environmental Toxicology and Chemistry. 2017. https://doi.org/10.1002/etc.3873 by Bradley, P.M., W.A. Battaglin, J.M. Clark, F.P. Henning, M.L. Hladik, L.R. Iwanowicz, C.A. Journey, J. Riley, and K.M. Romanok.