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.