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DESCRIPTION:

Latitude 13°32'30.6",   Longitude -144°50'02.0"   NAD83
Guam, Guam   , Hydrologic Unit 22010000

Well depth: 491 feet
Hole depth: 704 feet
Land surface altitude: 348.31 feet above GUVD04.
Well completed in "Other aquifers" (N9999OTHER) national aquifer.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations     (availability statement)	2004-05-21	2025-07-12
Daily Data
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 A, -105.86 )	2004-05-22	2005-02-22	780
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 B, -116.59 )	2004-05-22	2005-02-22	699
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 C, -124.52 )	2004-05-22	2005-01-21	639
Groundwater level above local mean sea level (LMSL), feet	1984-05-25	2004-05-16	4874
Groundwater level above Guam Vertical Datum of 2004, feet	2004-05-22	2025-07-11	7013
Daily Statistics
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 A, -105.86 )	2004-05-22	2005-02-22	260
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 B, -116.59 )	2004-05-22	2005-02-22	233
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 C, -124.52 )	2004-05-22	2005-01-21	213
Groundwater level above local mean sea level (LMSL), feet	1984-05-25	2004-05-16	4874
Groundwater level above Guam Vertical Datum of 2004, feet	2004-05-22	2025-07-11	7013
Monthly Statistics
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 A, -105.86 )	2004-05	2005-02
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 B, -116.59 )	2004-05	2005-02
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 C, -124.52 )	2004-05	2005-01
Groundwater level above local mean sea level (LMSL), feet	1984-05	2004-05
Groundwater level above Guam Vertical Datum of 2004, feet	2004-05	2025-07
Annual Statistics
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 A, -105.86 )	2004	2005
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 B, -116.59 )	2004	2005
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius -- ( EX10 C, -124.52 )	2004	2005
Groundwater level above local mean sea level (LMSL), feet	1984	2004
Groundwater level above Guam Vertical Datum of 2004, feet	2004	2025
Field groundwater-level measurements	1981-09-24	2025-07-12	309
Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP)	1982-07-15	1995-04-04	205
Water-Year Summary	2007	2025	19
Revisions	Loading...

OPERATION:

Record for this site is maintained by the USGS Pacific Islands Water Science Center

Email questions about this site to Pacific Islands Water Science Center Water-Data Inquiries

ADDITIONAL INFORMATION

For this site, "Field groundwater-level measurements"
displayed in "Table of data" or "Tab-separated
data" formats indicate water levels above two different vertical
datums for each measurement date and time, although only one of the
datums currently is appropriate and accurate for the measurement. In
general, the appropriate vertical datum is date dependent. The
appropriate datum for water levels measured before about 2005 to 2010
is LMSL (local mean sea level), whereas the appropriate datum for water
levels measured after about 2005 to 2010 is the most current vertical
datum available (GUVD04 for Guam; NMVD03 for Saipan). The dates that
are appropriate for each datum are site specific and have yet to be
determined for this site. Also, the vertical datum indicated in the
graphical output of "Field groundwater-level measurements"
may reflect an incorrect datum, depending on the range of dates being
displayed.


  

    

  

  

    


    


    
Station operated in cooperation with the Water and Environmental Research
    Institute, University of Guam.