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Concentrations of Per- and Polyfluoroalkyl Substances (PFAS) in Lake-Bottom Sediments of Ashumet Pond on Cape Cod, Massachusetts, 2020 (ver. 2.0, February 2024) Lake-bottom sediment and associated quality-control samples were collected in August 2020 from one coring location (U.S. Geological Survey station 413756070321301, ASHUMET POND, MASHPEE MI-ASHPD-0011) in Ashumet Pond downgradient from a former fire-training area on Cape Cod, Massachusetts. The core was collected to determine if per- and polyfluoroalkyl substances (PFAS) were present in the bottom sediments of a lake known to have elevated concentrations of PFAS in surface water and groundwater (Tokranov and others, 2021), and whether the sediments could act as a continuous source of PFAS to the lake. Processing the sediment core entailed collection of discrete samples at intervals ranging from 1-5 centimeters (cm)... Categories: Data, Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cape Cod, Eastern United States, Environmental Health, Falmouth, Hydrology, All tags... Mashpee, Massachusetts, PFAS, Sandwich, Sedimentology, USGS Science Data Catalog (SDC), Water Quality, chemical analysis, environment, grain-size analysis, hydrogeology, limnology, radiometric dating, sedimentation, vibracoring, Fewer tags Urban sediment and fallout radionuclide input characteristics of Dead Run watershed in Catonsville, Maryland for 2017-2018 (ver. 1.1, March 2020) This metadata record documents two comma delimited tables that contain information on fallout radionuclides and urban sediments within Dead Run watershed in Catonsville, Baltimore County, Maryland. Measurements include radiological activity for rainwater and sediment samples, sediment particle size information, suspended sediment concentration measurements, elemental composition of sediments, and sediment yields of paved surfaces. First posted - November 13, 2019 (available from author) Revised - March 19, 2020 (version 1.1) Categories: Data, Data Release - Revised; Tags: Baltimore, Geomorphology, Piedmont, Sediment Yield, Soil Sciences, All tags... USGS Science Data Catalog (SDC), Upper Chesapeake Bay, Urban Basin, atmospheric deposition (chemical & particulate), cities, grain-size analysis, sediment transport, Fewer tags