Filters: Tags: {"type":"Theme"} (X) > partyWithName: Charles A Cravotta (X)
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Groundwater quality data for 472 domestic well-water samples were retrieved from the USGS National Water Information System (NWIS) database and combined with descriptive information on the sampled well locations. The NWIS data for a sample, collected on the selected date, were averaged into a single record (one per well), and rounded according to USGS protocols. For evaluation and reporting, the water-quality data were further combined with physical attributes and classified by lithology, topographic position, physiographic province, region, redox, and pH (as standalone matrix, one row per well). A second data matrix file incorporating minimum reporting levels for censored and low-reported values (set to 0.99X highest...
Categories: Data;
Tags: Bradford County,
Clinton County,
Geochemistry,
Groundwater Quality,
Hydrology,
This dataset contains the lithologic class and topographic position index information and quality-assurance and quality-control data not available in the online National Water Information System for 54 domestic wells sampled by the U.S. Geological Survey in Clinton County, Pennsylvania, May-September 2017. The topographic position index (TPI) for each well location was computed on the basis of a 25-meter digital elevation model (U.S. Geological Survey, 2009) using criteria reported by Llewellyn (2014) to indicate potential classes for topographic setting. The bedrock geologic unit and primary lithology were determined for each well location on the basis of the digital bedrock geologic map of Pennsylvania (Miles...
Lithium concentrations in untreated groundwater from 1,464 public-supply wells, 1,676 domestic-supply wells, and 1,560 monitoring wells distributed across 33 principal aquifers in the United States were evaluated for spatial variations and possible explanatory factors. For context, lithium concentrations are compared to a drinking-water only threshold (60 micrograms per liter) and a Health-Based Screening Level (HBSL, 10 micrograms per liter). These thresholds were exceeded in 9% and 45% of samples from public-supply wells and in 6% and 37% from domestic-supply wells, respectively. Exceedances were most frequent for arid regions and older groundwater. Groundwater lithium concentrations were highest in unconsolidated...
Categories: Data;
Tags: Hydrology,
NAWQA,
USGS Science Data Catalog (SDC),
United States,
Water Quality,
This data release reports water-quantity and water-quality data collected during 2014-2016 by the U.S. Geological Survey (USGS) and in cooperation with the National Park Service (NPS) at the Allegheny Portage Railroad National Historic Site (ALPO) in Blair and Cambria Counties, Pennsylvania (figure 1). These data establish a base-line for current hydrologic conditions and may be helpful to evaluate potential changes in the hydrologic characteristics of streams and associated wetlands at the ALPO Summit area (figure 2). The data are summarized in the interpretive report, “Hydrologic Characteristics and Water Quality of Headwater Streams and Wetlands at the Allegheny Portage Railroad National Historic Site, Summit...
Categories: Data;
Tags: Blair County,
Cambria County,
USGS Science Data Catalog (SDC),
Water Quality,
Water Resources,
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