USGS Water-Year Summary for Site 132813144472771

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	Available Parameters
	72229 Elevation, GW, GUVD04(Mean)

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Water year 2024: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2024

132813144472771 A-16, Barrigada, Guam

Other aquifers
Limestone

LOCATION - Lat 13°28'16.9", long -144°47'33.1" referenced to North American Datum of 1983, Guam County, GM, Hydrologic Unit 22010000, at BP Carbullido Elementary School, about 600 ft. south of the intersection of Kanada-Toto Loop Road and Guam Route 8/Purple Heart Memorial Highway in Barrigada, Guam.

REVISIONS HISTORY - A water level on 04/26/2017 was approved with the incorrect time of 15:04. The time was corrected to 17:04 on 05/22/2018 by HAJ.

GROUNDWATER RECORDS

WELL CHARACTERISTICS - Depth 229 ft. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined. A-16 is a drilled basal water table well with a 10-inch steel casing. The originally reported well depth is unknown. Sounding in 2015 indicated the total well depth was 229 ft. below MP. A video log conducted in 2017 with EA Engineering indicated the total well depth was 226.2 ft. below land surface.

DATUM - Land-surface datum is 207.45 ft above undefined vertical datum. Measuring point: top of steel casing, 208.0 ft above Local Mean Sea Level, Dec. 29, 1977 to Mar. 7, 2008; top of steel casing, west side, near door, 207.72 ft above Guam Vertical Datum of 2004, Mar. 6, 2008 to Aug. 21, 2021; Top of casing on stainless steel bracket, marked with black triangle, 209.03 ft above Guam Vertical Datum of 2004, Aug. 13, 2021 to Jan. 13, 2022; Black sharpie triangle on top of stainless steel well cap bracket, south side. Altitude determined from leveling survey in May 2024, 209.05 ft above Guam Vertical Datum of 2004, Jan. 14, 2022 to present. At A-16, "RM1A," a USGS brass tablet in the concrete well pad denotes land surface datum and is 207.446 ft. above GUVD04; this point was last surveyed on 05/08/2024. Water-level elevations have been referenced to GUVD04 beginning 09/18/2015.

PERIOD OF RECORD -

Discrete groundwater-level measurements have been collected at A-16 since March 1980. Continuous water levels have been recorded at A-16 since March 2008.

EXTREMES FOR PERIOD OF RECORD -

Highest recorded groundwater level: 8.24 ft. above GUVD04 (05/25/2023 15:15:00, 15:30:00, 15:45:00, 16:00:00, 16:15:00, 16:30:00, 16:45:00, & 17:00:00)

Lowest recorded groundwater level: 3.16 ft. above GUVD04 (04/01/2016 02:30:00, 02:45:00, 03:00:00, 03:15:00, 03:30:00, & 03:45:00)