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USGS 425840077133901 Local number, Ot-900, near Manchester NY

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION.--Lat 42°58'40", long 77°13'39" referenced to North American Datum of 1927, Ontario County, NY, Hydrologic Unit 04140201, at New York State Thruway Interchange 43, near Manchester.
WELL CHARACTERISTICS.--Depth 139 ft. Upper casing diameter 6 in; top of first opening 11 ft, bottom of last opening 139 ft. Cased to 11 ft, open hole. Elevation of land-surface datum is 556.70 ft above NGVD of 1929 and 556.16 ft above NAVD of 1988 (VERTCON).
DATUM.--Land-surface datum is 556.7 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of shelter shelf, 11.71 ft above land-surface datum, Oct. 12, 2016 to present.  
PERIOD OF RECORD.--May 1955 to August 1995 and October 2002 to current year.
REVISIONS HISTORY.-- The 2007 water year was revised on March 15, 2008.
GAGE.--Water-stage recorder--15 minute; periodic measurements by USGS personnel.
REMARKS.--When drilled in 1955, this was an artesian well. Many water levels recorded were above land-surface datum from May 1955 to June 2007. Water in well casing above land surface datum was subject to freezing during extreme cold periods. Sometime between June and August 2007, a distinct and apparently permanent lowering of water levels in the well casing occurred, caused by unknown reasons. Satellite water-level telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured prior to June 2007 lowering of water levels, 11.14 ft above land-surface datum, Mar. 15, 1976; lowest water level recorded, 4.44 ft above land-surface datum, Oct. 28, 1991. Highest water level since June 2007, 1.22 ft below land-surface datum, Apr. 26, 2011; lowest water level, 4.99 ft below land-surface datum, Sept. 29, 2016.

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This station managed by the NY Water Science Center Ithaca.

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72019 Water level, depth LSD 2008-08-30  2019-10-23

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Depth to water level, feet below land surface

Most recent instantaneous value: 3.35 10-23-2019   16:00 EST
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