Geologic map of the Rapid City NW Quadrangle, Meade and Pennington counties, South Dakota

McGregor, Edward E.; Cattermole, John Mark

doi:10.3133/ofr72240

Cited by 2 publications

(1 citation statement)

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“…Subsurface lithology can affect the movement of contaminants in groundwater in the study area. The geology around EAFB consists of about 260 m (860 ft) of Cretaceousage Pierre Shale (bedrock) overlain by surficial deposits that are predominately alluvium (McGregor and Cattermole, 1973;Rahn and Glick, 2000). The alluvium consists of sand, silt, clay, and gravel that range in depth from about 3 to 12 m (10 to 40 ft; Tetra Tech Incorporated, 2008).…”

Section: Methodsmentioning

confidence: 99%

Groundwater assessment for petroleum hydrocarbon compounds associated with Fuels Area C, Ellsworth Air Force Base, South Dakota, 2014–18

Bender¹,

Galloway²,

Medler³

2021

Scientific Investigations Report

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and historical spills and releases in the area. The spatial and temporal variability in the BTEX compounds and naphthalene concentrations from samples collected from 2014 to 2018 do not indicate a consistent pattern of subsurface flow or contaminate movement that would be expected if a contaminant plume migrated with the flow and movement of groundwater.Gasoline-range organic and diesel-range organic compounds were detected in most of the groundwater samples collected in the study area around Fuels Area C in 2014-18; however, concentrations were often less than the laboratory reporting level. Median gasoline-range organic compound concentrations were greater than the laboratory reporting level at sites 1, 5, 9, 10, and 11. The highest concentrations of gasoline-range organic and diesel-range organic compounds generally were observed in samples collected from sites 10 and 11. Gasoline-range organic compound concentrations ranged from 1,500 to 9,700 micrograms per liter at site 10 and from less than 100 to 13,000 micrograms per liter at site 11. Diesel-range organic compound concentrations ranged from 9,600 to 55,000 micrograms per liter at site 10 and from 560 to 7,300 micrograms per liter at site 11. Study Area DescriptionFuels Area C (fig. 1) was constructed in about 1953 and has operated nearly continuously since construction (Tetra Tech Incorporated, 2008). The area is west of Ellsworth Street and covers about 0.3 square kilometer (79 acres; fig. 1). A small unnamed ephemeral stream is east of Fuels Area C, and Gateway Lake (not shown on figure) is northeast of the area. Prairie Ridge Golf Course is about 265 meters (m; 870 feet [ft]) east of Fuels Area C.

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Section: Methodsmentioning

confidence: 99%

Groundwater assessment for petroleum hydrocarbon compounds associated with Fuels Area C, Ellsworth Air Force Base, South Dakota, 2014–18

Bender¹,

Galloway²,

Medler³

2021

Scientific Investigations Report

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Localized Anisotropic Transmissivity in a Karst Aquifer

Greene¹,

Rahn²

1995

Groundwater

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Maps of cave passageways in the outcrop area of the uplifted Madison Limestone in the Black Hills, South Dakota, show that principal cavern development is oriented in the major direction of ground‐water flow, roughly radial to the Black Hills. Fracture‐trace analysis and measuremnt of joints in the Wind Cave area show that these orientations coincide with cave passageways. Aquifer testing at Rapid City indicates that a local principal transmissivity tensor is oriented in the direction of cave development and along the strikes of bedding‐plane fractures. This indicates that much of the permeability of the Madison aquifer is modern karst (post‐Laramide‐Orogeny). From the above, we conclude that a localized anisotropic permeability (principal direction of transmissivity) is developed by ground water flowing through fractures, dissolving the rock, and producing dissolution‐enhanced conduits along the direction of ground‐water flow. This localized principal direction of transmissivity can be deduced from analysis of the potentiometric surface, stream‐aquifer hydrographs, mapped cave passageways, aquifer tests, fracture traces, and measurements of joints in the field.

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Geologic map of the Rapid City NW Quadrangle, Meade and Pennington counties, South Dakota

Cited by 2 publications

References 0 publications

Groundwater assessment for petroleum hydrocarbon compounds associated with Fuels Area C, Ellsworth Air Force Base, South Dakota, 2014–18

Groundwater assessment for petroleum hydrocarbon compounds associated with Fuels Area C, Ellsworth Air Force Base, South Dakota, 2014–18

Localized Anisotropic Transmissivity in a Karst Aquifer

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