{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Philip T. Harte", "hasEmail": "mailto:ptharte@usgs.gov"}, "description": "A generic, three-dimensional finite-difference model, MODFLOW-2005 (version 1.12.00) and MODPATH-6 (version 6.0.01), \nwas created to better understand the amount of vertical flow and cross-contamination of trichloroethene (TCE) that may be occurring \nin discontinued extraction wells under current (2018-19) ambient-flow conditions at site 25 of the Edwards Air Force Base, California. \nThe wells are long-screened (100-ft long), contain a surrounding sandpack, and have not been pumped for approximately 10 years. \nThe groundwater flow model utilized multiple observations made from the field measurements of flow and transport to conceptualize, \ncalculate, and simulate in-well flow, and flow in the sand pack. The model was constructed to represent the average-flow condition \nnear a typical long-screened well and was used to estimate flow in the sandpack and the wellbore and scenarios related to the \nhypothetical sealing of the interior of the well but leaving the sandpack intact. Relative estimates of vertical hydraulic conductivity \nbetween the wellbore and sandpack guided simulations. This study provided unique insights into ambient flow in long-screened wells set in \nlow hydraulic conductivity aquifers that allowed for an improved assessment of remedial strategies to help mitigate cross-contamination of \nTCE. Understanding the dynamics of flow between the well and sandpack is needed to make informed decisions to mitigate contamination where \nthe wellbores are facilitating the spread of contaminants through cross contamination under ambient-flow conditions. Three simulations were done \nincluding a simulation with no well, a simulation with the well open and unpumped with a surrounding sandpack, and a simulation with the \nwell sealed with a liner but the sandpack left intact. Further information on the generic model is described in the journal article \n(https://doi.org/10.1007/s12665-024-11828-3). This USGS data release contains all the input and output files for the simulations described in the associated \njournal article.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P98OLKNE", "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.63a086e2d34e0de3a1f276f4.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_63a086e2d34e0de3a1f276f4", "keyword": ["California", "Cross contamination", "Edwards Air Force Base", "Groundwater Model", "Hydraulic conductivity", "MODFLOW-2005", "MODPATH-6", "Rogers Lake", "TCE", "USGS:63a086e2d34e0de3a1f276f4", "ambient flow", "environment", "flushing rates", "geoscientificInformation", "groundwater", "inlandWaters", "playa", "usgsgroundwatermodel", "water quality", "wellbore flow"], "modified": "2024-09-18T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-117.8971, 34.9537, -117.8971, 34.9537", "theme": ["geospatial"], "title": "MODFLOW-2005 and MODPATH-6 Data sets of Simulated Groundwater Flow to Evaluate Wellbore Flow in Generic Long-Screened Wells Under Ambient Flow"}