Agency
The agency that reported the data.
USGS - U.S. Geological Survey

Aquifer Type
Type of aquifer(s) well completed in.

County
County in which the site is located.
003 - Clark County, Nevada
009 - Esmeralda County, Nevada
017 - Lincoln County, Nevada
023 - Nye County, Nevada

Current Measuring Point Datum
The current measuring point height, in feet above (-) or below (+) land surface. Measuring point is zero at land surface.

Date
Date of water-level measurement (year, month, and day).

Date Constructed
The date on which well construction was completed (year, month, day).

Date Measuring Point Set
The date on which the measuring point was established (year, month, day).

DOE Hole Number
Official U.S. DOE hole number designation , commonly referred to as Red Book hole number.

Depth Cased
Depth to bottom of the lower most casing segment, in feet below land surface.

Hole Depth
Total depth to which the hole was drilled, in feet below land-surface datum. The drilled hole depth may be greater than the accessible well depth due to modification of the well, obstructions, or accumulation of sediment at the bottom of the well. The depth of each well was measured by USGS or was reported by other data sources.

Land-Surface Altitude
A representative altitude of land surface, in feet above sea level, at or near the site. Altitudes are obtained from land surveys or topographic maps. Sea level refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929).

Latitude
Latitude of the site, referenced to the North American Datum of 1927 (NAD27), in degrees, minutes, and seconds.

Local Number / Name
The local number/name (site number) is based on an index of hydrographic areas and on the rectangular subdivision of public lands referenced to the Mount Diablo base line and meridian for sites in Nevada. Each local number consists of four units separated by spaces: The first unit is the hydrographic area number; the second unit is the township, preceded by an N or S to indicate location north or south of the base line; the third unit is the range, preceded by an E to indicate location east of the meridian; and the fourth unit consists of the section number and letters designating the quarter section, quarter-quarter section and so on (A, B, C, and D, indicate the northeast, northwest, southwest, and southeast quarters, respectively), followed by a number indicating the sequence in which the well was inventoried. For example, site 230 S18 E51 34CBD1 is in the Amargosa Desert (hydrographic area 230) and is the first site inventoried in the southeast quarter of the northwest quarter of the southwest quarter of section 34, Township 18 South, Range 51 East, Mount Diablo base line and meridian.

Longitude
Longitude of the site, referenced to the North American Datum of 1927 (NAD27), in degrees, minutes, and seconds.

Lowermost Opening
Depth to bottom of deepest open interval, in feet below land surface.

Maximum Hole Diameter
The maximum diameter of the borehole, in inches.

Measurement Source
Source of the water-level data.
A - Reported by another government agency
D - Driller's log or report
G - Private geologist, consultant, or university associate
L - Depth to water interpreted from geophysical logs by personnel of source agency
M - Memory (owner, operator, driller)
O - Reported by the owner of the well
R - Reported by person other than the owner, driller, or another government agency
S - Measured by personnel of reporting agency
Z - Other source

Method
Method used to measure water level.
A - Airline measurement
B - Analog or graphic recorder
C - Calibrated airline measurement
E - Estimated
F - Transducer
G - Pressure-gage measurement
H - Calibrated pressure-gage measurement
L - Interpreted from geophysical logs
M - Manometer measurement
N - Nonrecording gage
R - Reported, method not known
S - Steel-tape measurement
T - Electric-tape measurement
V - Calibrated electric-tape measurement
Z - Other

Minimum Hole Diameter
The minimum diameter of the borehole, in inches.

Network
ERP - Act – Active USGS Environmental Restoration Program (ERP) water-level measurement site, water-level data currently being collected.
ERP - Inac – Inactive USGS Environmental Restoration Program (ERP) water-level measurement site, water-level data no longer being collected.
YMEMP - Act – Yucca Mountain Project, Environmental Monitoring Program, water-level measurement site.

Number of Openings
Number of zones in the well that are open to the aquifer (such as screened intervals).

Primary Aquifer
The principal lithologic unit the well is completed in that yields water to the well.

Primary Use of Site
A - Anode (local use: Abandoned)
C - Standby emergency supply
D - Drain
E - Geothermal
G - Seismic
H - Heat reservoir
M - Mine
O - Observation
P - Oil or gas well
R - Recharge
S - Repressurize
T - Test
U - Unused
V - Withdrawal and return (injection) of water
W - Withdrawal of water
X - Waste disposal
Z - Destroyed

Primary Use of Water
A - Air conditioning (local use: Artificial recharge)
B - Bottling
C - Commercial
D - Dewater (local use: Public supply and artificial recharge)
E - Power
F - Fire
H - Domestic
I - Irrigation
J - Industrial (cooling)
K - Mining
M - Medicinal
N - Industrial
P - Public supply
Q - Aquaculture
R - Recreation
S - Stock
T - Institutional
U - Unused
Y - Desalination
Z - Other (miscellaneous uses not included in the listed categories)

Source of Water-Use Data (monthly)

A - Estimated from pump run times recorded on daily ammeter charts supplied by Bechtel, Nevada (Bechtel) or Reynolds Electrical and Engineering Company (REECo)

C - Intermittent use for cleaning purposes at the U.S. Environmental Protection Agency farm

D - No known withdrawals. Any unreported withdrawals are believed to be minor.

E - Metered data from NSTec (National Security Technologies), Bechtel, or REECo water production reports; includes estimated values.

F - Data from Mavrik Zavarin, Lawrence Livermore National Laboratory, written commun., 2007.

I - Withdrawals during month were likely; however, data not available to calculate monthly total.

H - Insufficient data to determine monthly value. Annual value listed in annual data set as reported in Moreo and others, 2003, Estimated Ground-Water Withdrawals from the Death Valley Regional Flow System, Nevada and Calfornia, 1913-98: U.S. Geological Survey Water Resources Investigations Report 03-4245.

K - Data from Sawyer D.A., Thompson, J.L., and Smith, D.K., October 1999, The CHESHIRE Migration Experiment, A Summary Report: Los Alamos National Laboratory Report LA-13555-MS.

L - Data reported by Los Alamos National Laboratory (LANL)

M - Metered data from NSTec, Bechtel, or REECo water production reports.

N - Data from Stoller-Navarro Joint Venture, 2004, Integrated data report for the RNM-2s multi-well aquifer test at Frenchman Flat, Nevada Test Site, Nevada: preliminary report.

O - Data from Stoller-Navarro Joint Venture, January 2005, ER-6-1 well cluster multiple well aquifer test - tracer test data report, vol. I, II, and III, rev. 0.

P - Partial month of metered data. Number of days reported listed in "Days Reported" column.

R - Insufficient data to determine monthly value. Annual value listed in annual data set as reported in Claassen, H.C., 1973, Water quality and physical characteristics of Nevada Test Site water-supply wells: U.S. Geological Survey Open-File Report USGS-474-158, 145 p.

U - Unknown whether well was used for water supply

Y - Insufficient data to determine monthly value. Annual value listed in annual data set as estimated from Young, R.A.,1972, Water Supply for the Nuclear Rocket Development Station at the U.S. Atomic Energy Commission's Nevada Test Site: U.S. Geological Survey Water-Supply Paper 1938. Estimate is based on a reported withdrawal of 500,000 gallons per day.

Z - Insufficient data to determine monthly value. Annual value listed in annual data set as estimated in Claassen, H.C., 1973, Water quality and physical characteristics of Nevada Test Site water-supply wells: U.S. Geological Survey Open-File Report USGS-474-158, 145 p.

Source of Water-Use Data (yearly)

A - Estimated from pump run times recorded on daily ammeter charts supplied by Bechtel, Nevada (Bechtel) or Reynolds Electrical and Engineering Company (REECo).

C - Intermittent withdrawals for cleaning purposes at the U.S. Environmental Protection Agency farm.

D - No known withdrawals. Any unreported withdrawals are believed to be minor.

E - Metered data taken from NSTec (National Security Technologies), Bechtel, or REECo water production reports; includes estimated values.

F - Data from Mavrik Zavarin, Lawrence Livermore National Laboratory, written commun., 2007.

I - Withdrawals during year were likely; however, data not available to calculate annual total.

H - Estimated withdrawals based on workforce population and per capita water use. Reported in Moreo and others, 2003, Estimated ground-water withdrawals from the Death Valley Regional Flow System, Nevada and California, 1913-98: U.S. Geological Survey Water Resources Investigations Report 03-4245.

K - Data from Sawyer D.A., Thompson, J.L., and Smith, D.K., October 1999, The CHESHIRE Migration Experiment, A Summary Report: Los Alamos National Laboratory (LANL) report LA-13555-MS.

L - Data reported by Los Alamos National Laboratory (LANL).

M - Metered data from NSTec, Bechtel, or REECo water production reports.

N - Data from Stoller-Navarro Joint Venture, 2004, Integrated data report for the RNM-2s multi-well aquifer test at Frenchman Flat, Nevada Test Site, Nevada: preliminary report.

O - Data from Stoller-Navarro Joint Venture, January 2005, ER-6-1 well cluster multiple well aquifer test - tracer test data report, vol. I, II, and III, rev. 0.

P - Partial year of metered data. Number of days reported listed in "Days Reported" column.

R - Reported in Claassen, H.C., 1973, Water quality and physical characteristics of Nevada Test Site water-supply wells: U.S. Geological Survey Open-File Report USGS-474-158, 145 p.

S - Listed as a dash (--) in Claassen, H.C., 1973, Water quality and physical characteristics of Nevada Test Site water-supply wells: U.S. Geological Survey Open-File Report USGS-474-158, 145 p. Unable to determine if Claassen used a dash to represent years with zero withdrawals or years where withdrawals were unknown.

U - Unknown whether well was used for water supply

Y - Annual value estimated from Young, R.A.,1972, Water Supply for the Nuclear Rocket Development Station at the U.S. Atomic Energy Commission's Nevada Test Site: U.S. Geological Survey Water-Supply Paper 1938. Estimate is based on a reported withdrawal of 500,000 gallons per day. No withdrawal occurred between January 2, 1963 and February 18, 1964 (Howells, written communication, 1982).

Z - Annual value estimated in Claassen, H.C., 1973, Water quality and physical characteristics of Nevada Test Site water-supply wells: U.S. Geological Survey Open-File Report USGS-474-158, 145 p.

State
State in which the site is located.
32 - Nevada
06 - California

Status
The status of the well when water level was measured. No status is given if the water level represents a static level
D - The site was dry (no water level recorded)
E - The site was flowing recently
F - The site was flowing, but the head could not be measured (no water level recorded)
G - A nearby site that taps the same aquifer was flowing
H - A nearby site that taps the same aquifer had been flowing recently
I - Injector site (recharge water being injected into the aquifer)
J - Injector site monitor (a nearby site that taps the same aquifer is injecting recharge water)
M - The site was plugged
N - The measurement was discontinued
O - An obstruction was encountered in the well above the water surface (no water level recorded)
P - The site was being pumped
R - The site had been pumped recently
S - A nearby site that taps the same aquifer was being pumped
T - A nearby site that taps the same aquifer had been pumped recently
V - Foreign substance was present on the surface of the water
W - The well was destroyed
X - The water level was affected by stage in nearby surface-water site
Z - Other conditions that would affect the measured water level

Time
Time of water-level measurement, in hours and minutes (24-hour clock).

USGS Site Identification
Sites are identified by the standard U.S. Geological Survey (USGS) identification number, which is based on an initial determination of latitude and longitude of the site. The site identification serves as a unique identification number in files and databases of the USGS and indicates the approximate geographic location of each site. The identification consists of 15 digits: the first 6 digits denote the degrees, minutes, and seconds of latitude; the next 7 digits denote degrees, minutes, and seconds of longitude; and the last 2 digits (assigned sequentially) identify the site within a 1-second grid. For example, site 363530116021401 is at approximately 36°35'30" latitude and 116°02'14" longitude, and it is the first site recorded in that 1-second grid. Even if a more precise latitude and longitude are subsequently determined, the site identification number remains unchanged. Latitude and longitude shown for a site, therefore, are the most accurate locators.

Uppermost Opening
Depth to top of shallowest open interval, in feet below land surface.

Water Level below land surface
Water level, in feet below land-surface datum (water level above land surface is preceded by a minus (-) sign).

Water-Level Accuracy
0 - Accurate to nearest foot
1 - Accurate to nearest tenth of a foot
2 - Accurate to nearest one-hundredth of a foot

Well Depth
Well depth is the measurable depth to the bottom of the well. The drilled hole depth may be greater than the accessible well depth due to modification of the well, obstructions, or accumulation of sediment at the bottom of the well. The depth of each well was measured by USGS or was reported by other data sources.