PROVISIONAL DATA SUBJECT TO REVISION
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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 National Geodetic Vertical Datum of 1929, Mar. 19, 1990 to Aug. 28, 2024; Top of 2" PVC casing, north edge, inside of black steel standup pipe, 23.288 ft above National Geodetic Vertical Datum of 1929, Aug. 28, 2024 to present.
PERIOD OF RECORD.--March 1990 to March 1995, November 2001 to current year.
GAGE.--Water level recorder installed November 2020; 15-minute recording interval. Periodic manual measurements by USGS personnel.
REMARKS.--Water level affected by tidal fluctuation.
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 2.94 ft above NGVD of 1929, Apr. 4, 2024; lowest measured, 0.62 ft above NGVD of 1929, Feb. 19, 2013.
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 National Geodetic Vertical Datum of 1929, Mar. 19, 1990 to Aug. 28, 2024; Top of 2" PVC casing, north edge, inside of black steel standup pipe, 23.288 ft above National Geodetic Vertical Datum of 1929, Aug. 28, 2024 to present.
PERIOD OF RECORD.--March 1990 to March 1995, November 2001 to current year.
GAGE.--Water level recorder installed November 2020; 15-minute recording interval. Periodic manual measurements by USGS personnel.
REMARKS.--Water level affected by tidal fluctuation.
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 2.94 ft above NGVD of 1929, Apr. 4, 2024; lowest measured, 0.62 ft above NGVD of 1929, Feb. 19, 2013.
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