DRILLING PROGRAM BACKGROUND
level data from the NWRPO Water Level Measurement
Program (WLMP) have been used to identify spatial
trends (rises and declines) throughout southern Nye
County and portions of Clark County, Nevada and Inyo
Several data gaps were
identified during this analysis, particularly in
On the alluvial fan area in Pahrump.
Down gradient from previous nuclear tests
on the Nevada Nuclear Security Site.
In the northern Amargosa
Infill data gaps
in the water level measurement program
geologic controls on ground-water flow
Provide data to
assist Nye County Water District with basic
water resource characterization in southern Nye
are three (3) primary tasks with the following specific objectives:
Groundwater Conditions in Pahrump Valley.
Five (5) boreholes and wells
to infill data gaps in the WLMP,
especially on the Pahrump Fan.
Water Resource Conditions in Amargosa Desert.
Seven (7) boreholes and
monitoring wells to: 1) collect
baseline flow and chemical data south and west
of the Nevada Nuclear Security Site, and 2) determine head
relationships near the Gravity Fault to help
determine the role of the Gravity Fault in
restricting or facilitating groundwater flow in
the Amargosa Valley.
Surface Water Conditions in Southern Nye County.
Two (2) boreholes and
monitoring wells in
Oasis Valley to collect baseline flow
and chemical data in areas (far) down
gradient from previous nuclear tests.
Fourteen boreholes were drilled by Hydro Resources,
Inc. for a total of 4,600 feet
are shown on the GWE Well map).
The drilling was completed in two phases between May
2010 and January 2011.
All boreholes are located on existing Early
Warning Drilling Program (EWDP) sites or on privately-owned
Air foam, conventional circulation methods were
10-inch surface casing set to 20 feet, 8-inch
borehole drilled to total depth
Boreholes were drilled to approximately 100 feet
below the water table
The shallowest borehole was OV-2 (119.8 feet);
the deepest was PV-1 (610 feet)
Monitor Well Completion Parameters:
Wells completed with 4-inch Schedule 80 PVC
Sandpack and grout were emplaced using tremmie
Surface completion with protective steel casing,
concrete pad, and locking well cap
Borehole Data Collection Parameters:
All data are collected under the NWRPO Quality
Cuttings samples were collected every 5 feet
Sediments were logged using Unified Soil Classification System descriptions
Consolidated rock was logged using quantitative
Borehole geophysical logs were collected
-Open-hole (gamma, resistivity, temperature, and
-Completion (gamma, temperature, fluid
resistivity, and density)
4-inch casing limited pump tests to 3-inch pumps
resulting in low flow rates and very little
Constant discharge testing
Water Resource Characterization and Monitoring data
packages and publications are completed, they will
be made available for
Each completed well will include
well completion diagrams, summary geologic information, pump test data, water
chemistry, and water level data.