Version History for USGS Data Release 

O'Neal, Z.O., Meadows, M.C., Tokranov, A.K., Eagle, M.J., O'Keefe Suttles, J.A., Buczkowski, B., Repert, D.A., Greidanus, C., and LeBlanc, D.R., 2023, Concentrations of per- and polyfluoroalkyl substances (PFAS) in lake-bottom sediments of Ashumet Pond on Cape Cod, Massachusetts, 2020 (ver. 2.0, February 2024): U.S. Geological Survey data release, https://doi.org/10.5066/P9DM4E66. 

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Version 1 posted online June 20, 2023
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Version 2.0 revised and reposted online February 28, 2024 

Changes in version 2.0 

1. Grain size data were reprocessed, reviewed, and returned to affected WHCMSC Sediment Laboratory customers in September 2023 as part of a corrective action taken after an issue was identified in the data processing workbook (version 1.0) used to calculate grain size statistics and phi class distributions from raw data obtained from the Sediment Laboratory's Horiba LA-960 laser diffraction unit. Workbook version 2.1 was used to reprocess the data. For detailed information, please refer to the metadata for this data release.