The Marcellus Shale Energy and Environment Laboratory (MSEEL) is part of the Northeast Natural Energy LLC (NNE) production facility on the Monongahela River in Monongalia County, West Virginia, USA. Natural gas extraction in the area creates large volumes of wastewater that may contain chemical compounds that pose risks to humans, animals, and the environment. The U. S. Geological Survey (USGS) has been studying the organic compounds in water produced from shale gas wells and in 2014, NNE started drilling two production wells in the Marcellus Shale. The well, MIP (Morgantown Industrial Park) -5H, was completed the following year. Samples were collected from this well. Large volumes of wastewater fluids were produced from this well and contain a mixture of chemicals added during hydraulic fracturing of the formation and chemical constituents from the host rocks. The original hydraulic fracturing fluids and the wastewater contain organic materials that could be toxic or pose risks to the environment if leaked, spilled, or improperly disposed of. This project was designed to collect comprehensive data from multiple sample types, including Monongahela River water, wastewater collected at the separator (during the flowback and produced-water phase), storage tank wastewater, and field blanks. Water samples for the analyses contained in this release were collected from July 2015 through December 2018. Samples of Monongahela River water were collected from a lined holding pond adjacent to the MIP well pad on November 5, 2015. Wastewater was intermittently sampled from the MIP-5H separator on the well pad from December 10, 2015, to December 6, 2018. The wastewater produced during the first two weeks of production was labeled as flowback water until December 23, 2015, then the wastewater produced after this date was defined as produced water. A storage tank at the well pad site was sampled on December 6, 2018. This data release contains non-target liquid chromatography/high-resolution mass spectrometry data.

The Marcellus Shale Energy and Environment Laboratory (MSEEL) is part of the Northeast Natural Energy LLC (NNE) production facility on the Monongahela River in Monongalia County, West Virginia, USA. Natural gas extraction in the area creates large volumes of wastewater that may contain chemical compounds that pose risks to humans, animals, and the environment. The U. S. Geological Survey (USGS) has been studying the organic compounds in water produced from shale gas wells and in 2014, NNE started drilling two production wells in the Marcellus Shale. The well, MIP (Morgantown Industrial Park) -5H, was completed the following year. Samples were collected from this well. Large volumes of wastewater fluids were produced from this well and contain a mixture of chemicals added during hydraulic fracturing of the formation and chemical constituents from the host rocks. The original hydraulic fracturing fluids and the wastewater contain organic materials that could be toxic or pose risks to the environment if leaked, spilled, or improperly disposed of. This project was designed to collect comprehensive data from multiple sample types, including Monongahela River water, wastewater collected at the separator (during the flowback and produced-water phase), storage tank wastewater, and field blanks. Water samples for the analyses contained in this release were collected from July 2015 through December 2018. Samples of Monongahela River water were collected from a lined holding pond adjacent to the MIP well pad on November 5, 2015. Wastewater was intermittently sampled from the MIP-5H separator on the well pad from December 10, 2015, to December 6, 2018. The wastewater produced during the first two weeks of production was labeled as flowback water until December 23, 2015, then the wastewater produced after this date was defined as produced water. A storage tank at the well pad site was sampled on December 6, 2018. This data release contains non-target liquid chromatography/high-resolution mass spectrometry data.

This U.S. Geological Survey (USGS) Data Release is focused on the geochemistry of wastewater (including flowback and produced water) samples, co-produced with natural gas, collected from the Marcellus Shale Energy and Environment Laboratory (MSEEL) site. MSEEL is a long-term field site and laboratory at the Northeast Natural Energy LLC (NNE) production facility, adjacent to the Monongahela River, located in western Monongalia County, West Virginia, USA. NNE began drilling two horizontal production wells, MIP (Morgantown Industrial Park) -5H and MIP-3H, in the Marcellus Shale in 2014. The wells were completed in December 2015. Large volumes of wastewater are generated with natural gas production. These wastewaters contain organic and inorganic chemical constituents from fracturing fluids used during drilling and stimulation of gas in host rocks/shale, as well as chemical compounds that are derived from formation water and the solid shale. Many of the organic and inorganic substances in the wastewater are potentially toxic and could pose an environmental risk if released due to spills, leaks, or unsafe disposal practices. Hydraulic fracturing fluid, field blanks, wastewater, and water from the Monongahela River stored in a lined holding pond adjacent to the MIP well pad, were collected from November 2015 through April 2019. The on-site storage tank was sampled from April 2017 through April 2019. Wastewater from the MIP-5H Separator Tank was collected daily at the beginning of the study to annually by the end of the study. One sample was collected from the MIP-3H Separator Tank in May 2018. This data release includes field measurements of temperature, specific conductance, total dissolved solids (TDS), and density; laboratory measurements of pH, non-volatile dissolved organic carbon (NVDOC), alkalinity, major ions, ammonia nitrogen, trace elements, low molecular weight organic acids (LMWOA), semi-volatile hydrocarbons, radium isotopes, and stable isotopes. There are seven files (*.xlsx and .csv) in this dataset: T1_DataDictionary, T2_RestonGeochemistry, T3_Mercury, T4_MenloGeochemistry, T5_pH_Buffers, T6_QAQC, and T7_Stable_Isotopes.

This U.S. Geological Survey (USGS) Data Release is focused on the geochemistry of wastewater (including flowback and produced water) samples, co-produced with natural gas, collected from the Marcellus Shale Energy and Environment Laboratory (MSEEL) site. MSEEL is a long-term field site and laboratory at the Northeast Natural Energy LLC (NNE) production facility, adjacent to the Monongahela River, located in western Monongalia County, West Virginia, USA. NNE began drilling two horizontal production wells, MIP (Morgantown Industrial Park) -5H and MIP-3H, in the Marcellus Shale in 2014. The wells were completed in December 2015. Large volumes of wastewater are generated with natural gas production. These wastewaters contain organic and inorganic chemical constituents from fracturing fluids used during drilling and stimulation of gas in host rocks/shale, as well as chemical compounds that are derived from formation water and the solid shale. Many of the organic and inorganic substances in the wastewater are potentially toxic and could pose an environmental risk if released due to spills, leaks, or unsafe disposal practices. Hydraulic fracturing fluid, field blanks, wastewater, and water from the Monongahela River stored in a lined holding pond adjacent to the MIP well pad, were collected from November 2015 through April 2019. The on-site storage tank was sampled from April 2017 through April 2019. Wastewater from the MIP-5H Separator Tank was collected daily at the beginning of the study to annually by the end of the study. One sample was collected from the MIP-3H Separator Tank in May 2018. This data release includes field measurements of temperature, specific conductance, total dissolved solids (TDS), and density; laboratory measurements of pH, non-volatile dissolved organic carbon (NVDOC), alkalinity, major ions, ammonia nitrogen, trace elements, low molecular weight organic acids (LMWOA), semi-volatile hydrocarbons, radium isotopes, and stable isotopes. There are seven files (*.xlsx and .csv) in this dataset: T1_DataDictionary, T2_RestonGeochemistry, T3_Mercury, T4_MenloGeochemistry, T5_pH_Buffers, T6_QAQC, and T7_Stable_Isotopes.

The Marcellus Shale Energy and Environmental Laboratory (MSEEL) field site in Morgantown, WV was established by West Virginia University in order to increase understanding of factors that affect resource recovery and environmental impacts from unconventional oil and gas development. The site, which is located in the Morgantown Industrial Park (MIP) adjacent to the Monongahela River, includes one well pad which hosts four horizontal gas wells that target the Marcellus Shale approximately 7400 ft below ground level. As part of the MSEEL study, the MIP 5H well was drilled in 2015. Water samples were collected from the holding pond used to hydraulically fracture the MIP 5H well (API 47-061-01699), and a time series of produced water samples were collected from the MIP 5H separator tank starting in 2016 when the well was opened for flowback and ending in 2019. This data release includes semi-quantitative analysis of polycyclic aromatic hydrocarbons (PAHs) identified in these water samples as well as a list of non-target compounds that were identified via gas chromatograph-mass spectrometry analysis and subsequent spectral matching against mass spectral libraries.

The Marcellus Shale Energy and Environmental Laboratory (MSEEL) field site in Morgantown, WV was established by West Virginia University in order to increase understanding of factors that affect resource recovery and environmental impacts from unconventional oil and gas development. The site, which is located in the Morgantown Industrial Park (MIP) adjacent to the Monongahela River, includes one well pad which hosts four horizontal gas wells that target the Marcellus Shale approximately 7400 ft below ground level. As part of the MSEEL study, the MIP 5H well was drilled in 2015. Water samples were collected from the holding pond used to hydraulically fracture the MIP 5H well (API 47-061-01699), and a time series of produced water samples were collected from the MIP 5H separator tank starting in 2016 when the well was opened for flowback and ending in 2019. This data release includes semi-quantitative analysis of polycyclic aromatic hydrocarbons (PAHs) identified in these water samples as well as a list of non-target compounds that were identified via gas chromatograph-mass spectrometry analysis and subsequent spectral matching against mass spectral libraries.

This dataset contains measurements of dissolved hydrocarbons in from various water sources, as well as ancillary raw calibration data showing the stability of the gas chromatograph with an atomic emission detector and flame ionization detector (GC-AED-FID) analytical system over time. Across multiple studies, samples from tap water, groundwater, surface water, springs, mine outflows, and blank materials were analyzed using this system over a period from 2014 to 2017, comprising 172 samples analyzed. In addition to water samples, 183 calibrations conducted over the same period of time are included to document the stability of the GC-AED-FID system over time. The target analytes in this study were: methane (CH4), ethane (C2H6), ethene (C2H4), ethyne (C2H2), propane (C3H8), propene (C3H6), i-butane (C4H10), n-butane (C4H10), 1-butene (C4H8), propyne (C3H4), i-pentane (C5H12), n-pentane (C5H12), 2-methyl-pentane (C6H14), 3-methyl-pentane (C6H14), hexane (C6H14), and benzene (C6H6).

This dataset contains measurements of dissolved hydrocarbons in from various water sources, as well as ancillary raw calibration data showing the stability of the gas chromatograph with an atomic emission detector and flame ionization detector (GC-AED-FID) analytical system over time. Across multiple studies, samples from tap water, groundwater, surface water, springs, mine outflows, and blank materials were analyzed using this system over a period from 2014 to 2017, comprising 172 samples analyzed. In addition to water samples, 183 calibrations conducted over the same period of time are included to document the stability of the GC-AED-FID system over time. The target analytes in this study were: methane (CH4), ethane (C2H6), ethene (C2H4), ethyne (C2H2), propane (C3H8), propene (C3H6), i-butane (C4H10), n-butane (C4H10), 1-butene (C4H8), propyne (C3H4), i-pentane (C5H12), n-pentane (C5H12), 2-methyl-pentane (C6H14), 3-methyl-pentane (C6H14), hexane (C6H14), and benzene (C6H6).

This U.S. Geological Survey data release provides a comprehensive dataset of water-quality data and sampling-site characteristics collected in 1978–2018 during a study of the effects of land disposal of treated wastewater on groundwater quality in an unconsolidated sand and gravel aquifer on Cape Cod, Massachusetts. Treated sewage-derived wastewater was discharged to rapid-infiltration beds at Joint Base Cape Cod for nearly 60 years before the disposal was moved to a different location in December 1995. The discharge formed a plume of contaminated groundwater that partly discharges to a glacial kettle lake about 1,600 feet from the beds and extends about 4.5 miles toward coastal saltwater bodies at Vineyard Sound. Water-quality samples were collected from monitoring wells, multilevel samplers (MLSs), continuous multichannel tubing samplers (CMTs), AMS gas-vapor sampling points (AMS, Inc., American Falls, Idaho), piezometers, temporary borings drilled by direct-push methods, and surface-water bodies to characterize the nature and extent of the contaminated groundwater and to observe the water-quality changes before and after wastewater disposal ended in 1995. Data are presented here for 604 wells (at 188 well-cluster locations), 1,155 MLS ports (at 61 locations), 42 CMT ports (at 6 locations), 13 gas-vapor points (at 1 location), 17 piezometers (at 5 locations), 536 depth intervals in direct-push profile borings (at 68 locations), 1 glacial kettle lake, and 1 wastewater-disposal discharge in and near the treated-wastewater plume. About 20,740 visits were made to individual sampling points between 1978 to 2018. This data release presents field water-quality measurements (specific conductance, pH, dissolved oxygen, turbidity and temperature; iron, MBAS and phosphate concentrations; and alkalinity); absorbance of ultraviolet/visible light; and concentrations of selected gases (including nitrous oxide, methane, dissolved inorganic carbon), dissolved organic carbon, selected nitrogen species (including nitrate, nitrite, ammonium, and total dissolved nitrogen), and selected inorganic solutes (including cations, anions, and minor elements). Information on sample collection and processing can be found in the Federal Geographic Data Committee (FGDC) metadata and “TableDefs CapeCodToxicsDatabase.xlsx.” The data are presented in two formats: Microsoft (MS) Access database (.accdb) and comma-delimited text (.csv) files. The MS Access version of the database (”DataRelease_CapeCodToxicsDatabase_v1.1.accdb”) contains 15 data tables linked by established relationships and 4 queries that repackage the data for the convenience of the user. Versions of the 4 queries and 15 tables exported from the MS Access database as comma-delimited text files have been zipped together by type (”tables” and ”queries,“ respectively). The text files are comma delimited, contain headings, and use double quotation marks to denote text fields. Numeric fields enclosed in double quotation marks are treated as text to preserve number formatting. Users not familiar with MS Access may prefer the text files to the MS Access database. The database can be reconstructed in Access or another relational data management platform from text-file tables in conjunction with the physical data model, the definitions of the table and field descriptions, and the Structured Query Language (SQL) commands described in a readme file zipped with the query text files. The table descriptions, field definitions, and significant figures for this database are documented by “TableDefs CapeCodToxicsDatabase.xlsx” and the FGDC metadata. The physical data model for this database is documented by “Relationships for CapeCodToxicsDatabase.jpg.” The relationships expressed in the .jpg file are further explained by an MS Word document titled “Relationships for CapeCodToxicsDatabase.docx.” Three types of data are included in the data tables: site and sample characteristics, water-quality data, and

This U.S. Geological Survey data release provides a comprehensive dataset of water-quality data and sampling-site characteristics collected in 1978–2018 during a study of the effects of land disposal of treated wastewater on groundwater quality in an unconsolidated sand and gravel aquifer on Cape Cod, Massachusetts. Treated sewage-derived wastewater was discharged to rapid-infiltration beds at Joint Base Cape Cod for nearly 60 years before the disposal was moved to a different location in December 1995. The discharge formed a plume of contaminated groundwater that partly discharges to a glacial kettle lake about 1,600 feet from the beds and extends about 4.5 miles toward coastal saltwater bodies at Vineyard Sound. Water-quality samples were collected from monitoring wells, multilevel samplers (MLSs), continuous multichannel tubing samplers (CMTs), AMS gas-vapor sampling points (AMS, Inc., American Falls, Idaho), piezometers, temporary borings drilled by direct-push methods, and surface-water bodies to characterize the nature and extent of the contaminated groundwater and to observe the water-quality changes before and after wastewater disposal ended in 1995. Data are presented here for 604 wells (at 188 well-cluster locations), 1,155 MLS ports (at 61 locations), 42 CMT ports (at 6 locations), 13 gas-vapor points (at 1 location), 17 piezometers (at 5 locations), 536 depth intervals in direct-push profile borings (at 68 locations), 1 glacial kettle lake, and 1 wastewater-disposal discharge in and near the treated-wastewater plume. About 20,740 visits were made to individual sampling points between 1978 to 2018. This data release presents field water-quality measurements (specific conductance, pH, dissolved oxygen, turbidity and temperature; iron, MBAS and phosphate concentrations; and alkalinity); absorbance of ultraviolet/visible light; and concentrations of selected gases (including nitrous oxide, methane, dissolved inorganic carbon), dissolved organic carbon, selected nitrogen species (including nitrate, nitrite, ammonium, and total dissolved nitrogen), and selected inorganic solutes (including cations, anions, and minor elements). Information on sample collection and processing can be found in the Federal Geographic Data Committee (FGDC) metadata and “TableDefs CapeCodToxicsDatabase.xlsx.” The data are presented in two formats: Microsoft (MS) Access database (.accdb) and comma-delimited text (.csv) files. The MS Access version of the database (”DataRelease_CapeCodToxicsDatabase.accdb”) contains 15 data tables linked by established relationships and 4 queries that repackage the data for the convenience of the user. Versions of the 4 queries and 15 tables exported from the MS Access database as comma-delimited text files have been zipped together by type (”tables” and ”queries,“ respectively). The text files are comma delimited, contain headings, and use double quotation marks to denote text fields. Numeric fields enclosed in double quotation marks are treated as text to preserve number formatting. Users not familiar with MS Access may prefer the text files to the MS Access database. The database can be reconstructed in Access or another relational data management platform from text-file tables in conjunction with the physical data model, the definitions of the table and field descriptions, and the Structured Query Language (SQL) commands described in a readme file zipped with the query text files. The table descriptions, field definitions, and significant figures for this database are documented by “TableDefs CapeCodToxicsDatabase.xlsx” and the FGDC metadata. The physical data model for this database is documented by “Relationships for CapeCodToxicsDatabase.jpg.” The relationships expressed in the .jpg file are further explained by an MS Word document titled “Relationships for CapeCodToxicsDatabase.docx.” Three types of data are included in the data tables: site and sample characteristics, water-quality data, and