LOCATION.--Lat 40°52'22.2", long 72°52'32.6" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, at Brookhaven National Laboratory, northeast corner of Thomson Road and Forth Avenue, Upton.
WELL CHARACTERISTICS.--Depth 1,395 ft. Upper casing diameter 10 in; top of first opening 1,312 ft, bottom of last opening 1,392 ft.
DATUM.--Land-surface datum is 85 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 2.07 ft above land-surface datum, 87.07 ft above National Geodetic Vertical Datum of 1929, Aug. 20, 1949 to present; Top of casing, 1.58 ft above land-surface datum, 86.58 ft above National Geodetic Vertical Datum of 1929, Nov. 18, 1998 to Sep. 4, 2015; Top of 10in metal cover, 86.71 ft above National Geodetic Vertical Datum of 1929, Sep. 3, 2015 to Feb. 6, 2024; Top of 10in metal cover, 86.724 ft above National Geodetic Vertical Datum of 1929, Feb. 6, 2024 to present.  
PERIOD OF RECORD.--August 1949 to current year.
GAGE.--Water-level recorder installed September 2015; 15-minute recording interval. Periodic manual measurements by USGS personnel.
REMARKS.--Cellular water-level telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 33.36 ft above NGVD of 1929, Aug. 20, 1949; lowest recorded, 29.66 ft above NGVD of 1929, Jan. 7, 2024.

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