{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Andrew J. Long", "hasEmail": "mailto:ajlong@usgs.gov"}, "description": "The U.S. Geological Survey, in cooperation with the U.S. Department of the Navy, \ndeveloped several 3-D groundwater flow models for used with MODFLOW-2005, \nMODFLOW-NWT, and SEAWAT model codes to evaluate variable-density \ngroundwater flow and contaminant transport in Operable Unit 1 on Naval Base \nKitsap in Keyport, Washington.  Chlorinated volatile organic compounds (CVOCs) \nhave migrated to groundwater beneath a former 9-acre landfill at Operable Unit 1 \n(OU-1). The three predominant ground-water contaminants are the chloroethene \ncompounds trichloroethene (TCE), cis-1,2-dichloroethene (cis-DCE), and vinyl \nchloride (VC).  A need for remedial action was identified because some of the \ncontaminants present a potential risk to humans primarily through drinking \ncontaminated groundwater or through ingesting seafood harvested from \ncontaminated surface water.  An ongoing effort with the U.S. Navy and U.S. \nGeological Survey (USGS) began in 1995 by evaluating the effectiveness of \nnatural attenuation processes for removing and controlling the migration of CVOCs \nin ground water at OU-1. Additional collection of geochemical and contaminant \nconcentration data demonstrated that biodegradation of CVOCs in shallow \ngroundwater at OU-1 is substantial and prevents most of the mass of dissolved-phase \nCVOCs in groundwater beneath the landfill from discharging to surface water. However, \ndissolved-phase contaminant concentrations in the hundreds of milligrams per liter \ncontinue to persist in localized areas of OU-1. Data suggest that residual sources of \nchloroethenes in the form of non-aqueous phase liquid remain at the site, and that \nbiodegradation is only partly effective at reducing the dissolved-phase contaminants \nthat are generated from these sources.  In 2018 an additional USGS effort was begun \nto simulate variable-density groundwater flow and contaminant transport in the vicinity \nof OU-1 using a revised hydrogeologic model of the site and a refined delineation of \npersistent contaminant sources. MODFLOW-2005 and MODFLOW-NWT model codes \nwere used to calibrate a new model.  Then groundwater flow and contaminant transport \nmodels were developed using SEAWAT-Version 4, a computer program based on \nMODFLOW and MT3DMS, to simulate three-dimensional variable-density groundwater \nflow coupled with multi-species solute transport. These models were used to simulate \nthe direction and rate of groundwater flow near OU-1, estimate the CVOC mass in \ngroundwater and the rate of mass loading, and assess possible remedial activities at \nOU-1. This USGS data release contains all of the input and output files for the \nsimulations described in the associated model documentation report \n(https://doi.org/10.3133/sir20205066).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9YNPPNL", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.1e3e81eb-cbd2-4f16-91ee-67db83e77c98.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_1e3e81eb-cbd2-4f16-91ee-67db83e77c98", "keyword": ["Groundwater", "Groundwater Model", "InlandWaters", "Keyport", "MODFLOW-2005", "MODFLOW-NWT", "Naval Base Kitsap", "SEAWAT", "Solute transport", "UCODE", "USGS:1e3e81eb-cbd2-4f16-91ee-67db83e77c98", "Washington", "environment", "geoscientificInformation", "inlandWaters", "remediation", "usgsgroundwatermodel"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-122.649043, 47.669352, -122.606888, 47.715213", "theme": ["geospatial"], "title": "MODFLOW-2005, MODFLOW-NWT, and SEAWAT models used to simulate variable-density groundwater flow and contaminant transport at Naval Base Kitsap, Keyport, Washington"}