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Water-Year Summary for Site 133120144505471

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Available Parameters
No information for all water years 2006 and onward
 
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USGS Water-Year Summary 2025
133120144505471 GHURA-Dededo, Guam
Other aquifers
Limestone
LOCATION - Lat 13°31'27.3", long -144°05'9.7" referenced to North American Datum of 1983, Guam County, GM, Hydrologic Unit is unknown, at Guam International Golf Course.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 785 ft. Upper casing diameter 5 in; top of first opening undefined, bottom of last opening undefined. Drilled basal groundwater monitoring well. Hole diameter 12 inches. Casing material PVC. Casing diameter 5 inches. Sounded depth 785 feet (2006). Drilled depth 785 feet.
DATUM - Land-surface datum is 394.13 ft above undefined vertical datum. Measuring point: top of pvc casing, marked, 395.87 ft above , May 18, 2004, to present.
PERIOD OF RECORD - Published USGS water-level data; 1998, 2000 to current year.
PERIOD OF DAILY RECORD - May 2004 to February 2005, and June 2010 to January 2011.
EXTREMES FOR PERIOD OF RECORD - Highest water-level measured, 4.43 feet above mean sea level, July 11, 2015; lowest water level measured, 1.0 feet above mean sea level, May 15, 2001.
WATER-QUALITY RECORDS
WELL CHARACTERISTICS - Depth 785 ft. Upper casing diameter 5 in; top of first opening undefined, bottom of last opening undefined. Drilled basal groundwater monitoring well. Hole diameter 12 inches. Casing material PVC. Casing diameter 5 inches. Sounded depth 785 feet (2006). Drilled depth 785 feet.
DATUM - Land-surface datum is 394.13 ft above undefined vertical datum. Measuring point: top of pvc casing, marked, 395.87 ft above , May 18, 2004, to present.
PERIOD OF RECORD - Specific-conductance and temperature profiles using a conductivity-temperature-pressure sensor (CTD): 2000 to present. Unpublished records available upon request. Fixed-depth specific-conductance continuous record data, May 2004 to February 2005, as part of the Northern Guam Lens Groundwater Monitoring study. Discrete-depth sampling, analysis for specific conductance and chloride concentration: 1979-1996. Unpublished records available upon request. Fluid-resistivity profiles: 1982 to 1984. Unpublished records available upon request.
INSTRUMENTATION - Water-quality monitor with recorder set to approximately 1-second recording interval. Monitor is trolled over the total depth of the well.
REMARKS - Two specific-conductance and temperature profiles are measured during each water year; one at the end of the wet season (January) and one at the end of the dry season (June or July). The CTD is checked against specific-conductance standards. The specific-conductance measurements in the profiles have not been adjusted based on the check measurements, however, the data are available to make adjustments. Depth is measured using a combination of a marked and calibrated cable and pressure readings from the CTD.