Association of State Boards of Geology (ASBOG) Exam – Sample

An alluvial aquifer is known to exist to a depth of 100 feet below ground surface (ft. bgs). The water table is 50 ft. bgs. The transmissivity of the aquifer has been determined to be 1,000 ft 2/day. The slope of the water table is 0.001 ft/ft. What is the average Darcy velocity of groundwater movement?

An aerial photograph taken with a camera having a focal length of 6 inches flying 10,000 feet above the datum has a scale of:

You have been asked to locate a public water supply well in a shallow, sand aquifer. Your locations are limited to three choices, all associated with land-use restrictions: Site 1 is 300 feet upgradient of a multi-acre, cattle feedlot. Site 2 is centered in an established residential neighborhood with 1/2-acre unsewered lots. Site 3 is 1,000 feet upgradient from a newly developed industrial park. In what order would you rank (best to worst) these three sites for installation of the new well?

You want to record the field location of pebble samples taken for determining regional size distribution of gravelly beds within a 10,000-square mile-area in the Great Plains Province. What is the most useful method for locating the sample sites so you can plot them for a preliminary report?

Which of the following indicates the highest measurement of permeability?

You have been retained to identify the extent of groundwater contamination resulting from a truck rollover accident with a release of 1,000 gallons of trichloroethylene (TCE) two days ago. A large municipal well field, located about 1.5 miles from the accident site, produces groundwater from a carbonate aquifer. Regional stratigraphy, based on published sources and the well field stratigraphic logs, is characterized by: 0-20 ft below ground surface (bgs), unconsolidated sand and silty sand; 20-35 ft bgs, hard, blue-green clay; 35-100 ft bgs, weathered, fractured limestone. Water levels in the surficial aquifer are reported to be about 12 ft bgs. Monitoring wells installed at the accident site should be screened from:

You have received a map from a client. You determine a 150-foot property line measures 3 inches on the map. You need a final scale at 1 inch = 20 feet (1:240). What percentage of enlargement or reduction is needed?

An oil well at elevation 9.575 ft., in the Desolation Formation, has been economically depleted. Management has decided to plus and abandon the well. Which of the following plugging procedures should be followed?

The term “growth fault” means which of the following?

All of these can result in a canyon cutting through a ridge. Which one is least likely to be the correct explanation?