LOCATION.--Lat 41°04'40.0", long 72°17'34.2" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, at south side of South Ram Island Drive and east side of Tuthill Drive, Shelter Island.
WELL CHARACTERISTICS.--Depth 29 ft. Upper casing diameter 2 in; top of first opening 24 ft, bottom of last opening 29 ft.
DATUM.--Land-surface datum is 21 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 0.45 ft below land-surface datum, 20.55 ft above land-surface datum, Mar. 19, 1990 to Aug. 28, 2024; Top of 2" PVC casing, north edge, inside of black steel standup pipe, 23.288 ft above land-surface datum, Aug. 28, 2024 to present.
PERIOD OF RECORD.--March 1990 to March 1995 and November 2001 to current year.
GAGE.--Measurement with chalked steel tape by United States Geological Survey personnel.
REMARKS.--Water level affected by tidal fluctuation.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.50 ft above sea level, April 7, 2010; lowest measured, 0.80 ft above sea level, September 18, 2006.

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