LOCATION.--Lat 40°47'51.0", long 73°24'08.1" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, northeast corner of East Neck Road. Entrance to The Greens at Half Hollow.
WELL CHARACTERISTICS.--Depth 87.2 ft. Upper casing diameter 2 in; top of first opening 77.2 ft, bottom of last opening 82.2 ft.
DATUM.--Land-surface datum is 138 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 0.20 ft below land-surface datum, 137.8 ft above land-surface datum, Jan. 7, 2003 to present.  
PERIOD OF RECORD.--January 2003 to current year.
GAGE.--Water-level recorder installed August 2014; 15-minute recording interval. Periodic manual measurements by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 81.39 ft above NGVD of 1929, Apr. 23, 2010; lowest recorded 68.34 ft above NGVD of 1929, Oct. 24, 2017.

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