Open-File Report 99-250
Selected Ground-Water Data for Yucca Mountain Region, Southern Nevada and Eastern
California, Through December 1998
ABSTRACT
The U.S. Geological Survey, in support of the U.S. Department of
Energy, Yucca Mountain Site Characterization Project, collects,
compiles, and summarizes hydrologic data in the Yucca Mountain
region. The data are collected to allow assessments of
ground-water resources during studies to determine the potential
suitability of Yucca Mountain for storing high-level nuclear
waste.
Data on ground-water levels at 34 wells and a fissure (Devils Hole),
ground-water discharge at 5 springs and a flowing well, and total
reported ground-water withdrawals within Crater Flat, Jackass
Flats, Mercury Valley, and the Amargosa Desert are presented for
calendar year 1998. Data collected prior to 1998 are graphically
presented and data collected by other agencies (or as part of
other Geolgical Survey programs) are included to further indicate
variations of ground-water levels, discharges, and withdrawals
through time.
A statistical summary of ground-water levels at seven wells in
Jackass Flats is presented to indicate potential effects of
ground-water withdrawals associated with U.S. Department of Energy
activities near Yucca Mountain. The statistical summary includes
the number of measurements, the maximum, minimum, and median
water-level altitudes, and the average deviation of measured water-level altitudes for selected baseline periods and for calendar years 1992-98. At two
water-supply wells and a nearby observation well, median water levels
for calendar year 1998 were slightly lower (0.2 to 0.3 foot) than
for their respective baseline periods. At the remaining four wells
in Jackass Flats, median water levels for 1998 were unchanged at
two wells and slightly higher (0.4 and 1.4 foot) at two wells than
those for their respective baseline periods.
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