PROVISIONAL DATA SUBJECT TO REVISION
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LOCATION.--Lat 40°39'30.5", long
73°38'27.7" referenced to North American Datum of
1983, Nassau County, NY, Hydrologic Unit 02030202, at Rockville
Centre Municipal Power Plant, in battery room, Maple Avenue and
Morris Avenue, Rockville Centre.
WELL CHARACTERISTICS.--Depth 50 ft. Upper casing diameter 8 in; top of first opening undefined, bottom of last opening undefined. Screen assumed at bottom.
DATUM.--Land-surface datum is 26.2 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of 2-in steel extender, 5.24 ft below land-surface datum, 20.96 ft above land-surface datum, Aug. 31, 1934 to present.
PERIOD OF RECORD.--August 1934 to current year. Unpublished records for August 1934 to September 1975 are available in files of the U.S. Geological Survey.
GAGE.--Periodic manual measurements by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.49 ft above NGVD of 1929, Apr. 15, 1939; lowest measured, 7.61 ft above NGVD of 1929, Aug. 21, 2002.
WELL CHARACTERISTICS.--Depth 50 ft. Upper casing diameter 8 in; top of first opening undefined, bottom of last opening undefined. Screen assumed at bottom.
DATUM.--Land-surface datum is 26.2 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of 2-in steel extender, 5.24 ft below land-surface datum, 20.96 ft above land-surface datum, Aug. 31, 1934 to present.
PERIOD OF RECORD.--August 1934 to current year. Unpublished records for August 1934 to September 1975 are available in files of the U.S. Geological Survey.
GAGE.--Periodic manual measurements by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.49 ft above NGVD of 1929, Apr. 15, 1939; lowest measured, 7.61 ft above NGVD of 1929, Aug. 21, 2002.
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