PROVISIONAL DATA SUBJECT TO REVISION
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LOCATION.--Lat 40°40'31", long
73°38'27" referenced to North American Datum of 1927,
Nassau County, NY, Hydrologic Unit 02030202, at west side of
North Village Avenue, 54 ft north of Demott Avenue, Rockville
Centre.
WELL CHARACTERISTICS.--Depth 645 ft. Upper casing diameter 4 in; top of first opening 620 ft, bottom of last opening 640 ft. Datum of gage is NGVD of 1929.
DATUM.--Land-surface datum is 36 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of coupling, 0.14 ft below land-surface datum, 35.86 ft above land-surface datum, Oct. 3, 1988 to Jun. 24, 2015; Top of 4 in. steel casing, north edge, 35.67 ft above land-surface datum, Jun. 23, 2015 to Oct. 23, 2023; New MP. Removed blue riser, 35.63 ft above land-surface datum, Feb. 8, 2019 to Oct. 23, 2023; Top of 4 in. steel casing, north edge, 35.674 ft above land-surface datum, Oct. 23, 2023 to present.
PERIOD OF RECORD.--March 1993 to March 1998, September 2003 to current year.
GAGE.--Water-level recorder installed September 2003 to August 2024; 15-minute recording interval. Periodic manual measurements made by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.01 ft above NGVD of 1929, Apr. 3, 2010; lowest recorded, 12.14 ft above NGVD of 1929, Aug. 30, 2016.
WELL CHARACTERISTICS.--Depth 645 ft. Upper casing diameter 4 in; top of first opening 620 ft, bottom of last opening 640 ft. Datum of gage is NGVD of 1929.
DATUM.--Land-surface datum is 36 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of coupling, 0.14 ft below land-surface datum, 35.86 ft above land-surface datum, Oct. 3, 1988 to Jun. 24, 2015; Top of 4 in. steel casing, north edge, 35.67 ft above land-surface datum, Jun. 23, 2015 to Oct. 23, 2023; New MP. Removed blue riser, 35.63 ft above land-surface datum, Feb. 8, 2019 to Oct. 23, 2023; Top of 4 in. steel casing, north edge, 35.674 ft above land-surface datum, Oct. 23, 2023 to present.
PERIOD OF RECORD.--March 1993 to March 1998, September 2003 to current year.
GAGE.--Water-level recorder installed September 2003 to August 2024; 15-minute recording interval. Periodic manual measurements made by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.01 ft above NGVD of 1929, Apr. 3, 2010; lowest recorded, 12.14 ft above NGVD of 1929, Aug. 30, 2016.
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