Particle-size distributions of core samples collected from the borehole for monitoring well ESW2B at Fort Irwin National Training Center, San Bernardino County, California
As part of a larger groundwater research study conducted at the U.S. Army Fort Irwin National Training Center (NTC), located approximately 35 miles north-northeast of Barstow, California, the U.S. Environmental Protection Agency (EPA), the U.S. Army, and the U.S. Geological Survey (USGS) have cooperated to evaluate unsaturated zone soil property data of cores from the borehole for a newly drilled monitoring well (ESW2B). Specific horizons of interest were identified and selected for detailed grain-size distribution analysis using the Fritsch Analysette A28 Image Sizer (particle analyzer) located at the USGS California Water Science Center (CAWSC) in San Diego, CA. The particle analyzer identified circularity and grain size (feret diameter) for individual grains in each subsample. Ten core subsamples from the ESW2B site were analyzed with the particle analyzer. Quality-assurance data collected as part of this task included measurements of National Institute of Standards and Technology (NIST) standard 8010, and custom reference materials (including a sample of alluvium from the Mojave River, and a combination of round silica beads and plastic bugle beads) created in the USGS San Diego office. A sieve analysis was done on one core subsample using ASTM International method D6913 (method A; 2017) as additional quality assurance method.
Complete Metadata
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| description | As part of a larger groundwater research study conducted at the U.S. Army Fort Irwin National Training Center (NTC), located approximately 35 miles north-northeast of Barstow, California, the U.S. Environmental Protection Agency (EPA), the U.S. Army, and the U.S. Geological Survey (USGS) have cooperated to evaluate unsaturated zone soil property data of cores from the borehole for a newly drilled monitoring well (ESW2B). Specific horizons of interest were identified and selected for detailed grain-size distribution analysis using the Fritsch Analysette A28 Image Sizer (particle analyzer) located at the USGS California Water Science Center (CAWSC) in San Diego, CA. The particle analyzer identified circularity and grain size (feret diameter) for individual grains in each subsample. Ten core subsamples from the ESW2B site were analyzed with the particle analyzer. Quality-assurance data collected as part of this task included measurements of National Institute of Standards and Technology (NIST) standard 8010, and custom reference materials (including a sample of alluvium from the Mojave River, and a combination of round silica beads and plastic bugle beads) created in the USGS San Diego office. A sieve analysis was done on one core subsample using ASTM International method D6913 (method A; 2017) as additional quality assurance method. |
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| identifier | http://datainventory.doi.gov/id/dataset/USGS_5ef650d382ced62aaae8d193 |
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| modified | 2025-05-15T00:00:00Z |
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| title | Particle-size distributions of core samples collected from the borehole for monitoring well ESW2B at Fort Irwin National Training Center, San Bernardino County, California |
