PLATE 1. Map showing location of wells and test holes at Nevada Test Site and vicinity, south-central Nevada FIGURES CONTENTS III Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929, formerly called "Sea-Level Datum of 1929"), which is derived from a general adjustment of the first-order leveling networks of the United States and Canada.
Plate 1. Map showing location of wells and test holes at Nevada Test Site and vicinity, south-central Nevada FIGURES CONTENTS III Sea Level: In this report "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD, formerlly called "Sea-Level Datum of 1929"), which is derived from a general adjustment of the first order leveling networks of the United States and Canada.
Project, collects, compiles, and sum marizes hydrologic data in the Yucca Mountain region. The data are collected to allow assessments of groundwater resources during studies to determine the poten tial suitability of Yucca Mountain for storing highlevel nuclear waste. Data on groundwater levels at 34 wells and a fissure (Devils Hole), groundwater discharge at 5 springs and a flowing well, and total reported groundwater withdrawals within Crater Flat, Jackass Flats, Mercury Valley, and the Amargosa Desert are pre sented for calendar year 1998. Data collected prior to 1998 are graphically presented and data collected by other agencies (or as part of other Geological Survey programs) are included to further indicate variations of groundwater levels, discharges, and withdrawals through time. A statistical summary of groundwater levels at seven wells in Jackass Flats is presented to indicate potential effects of groundwater withdrawals associ ated 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 devi ation 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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