Hydrogeologic setting,
water levels, and quality of water from supply wells at the U.S. Marine
Corps Air Station, Cherry Point, North Carolina
Water-Resources Investigations Report 88-4034
By O.B. Lloyd, Jr. and C.C. Daniel, III
Abstract
The Marine Corps Air Station is located in the Coastal Plain
province of North Carolina. Four freshwater aquifers of sand and
limestone underlie the area to a depth of about 500 feet. Saline
water occurs below this depth. The aquifers are separated by
three confining units that are thin and discontinuous in the
southern part. Water supply is obtained from 195- to 330 feet
wells in the Castle Hayne aquifer. Many wells are near landfills
that have received hazardous wastes. Groundwater withdrawals
have reduced hydraulic heads in the Castle Hayne some 20 feet
around active production wells, creating potential for downward
movement of contaminated water from the surface and for upward
movement of saline water that occurs at depth. Chemical analyses
of water from the Castle Hayne aquifer indicate median
concentrations of iron and manganese are 0.78 and 0.08 milligrams
per liter, respectively, and lead and (or) nickel exceed
drinking water
standards in three wells. Chloride increased from 10 to more
than 40 milligrams per liter in the deepest operating well over a
45-year period. Benzene concentrations range from 0.5 to 1.9
milligrams per liter in the southern part of the Air
Station but were below the 5 milligrams per
liter maximum contaminant level for drinking water. Fatty
acids were found in concentrations as much as 28 micrograms
per liter in water from wells in an area centered around the
intersection of Roosevelt Boulevard and Slocum Road.
Resampling is needed to verify all constituents
that indicate contamination.
Citation:
Lloyd, O.B., Jr., and Daniel, C.C., III, 1988, Hydrogeologic setting, water levels, and quality of water from supply wells at the U.S. Marine Corps Air Station, Cherry Point, North Carolina: U.S. Geological Survey Water-Resources Investigations Report 88-4034, 76 p.
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