LOCATION.--Lat 41°49'48", long 74°03'50" referenced to North American Datum of 1983, Ulster County, NY, Hydrologic Unit 02020007, Grist Mill Road, at Tillson.
WELL CHARACTERISTICS.--Depth 40 ft. Upper casing diameter 2 in; top of first opening 32 ft, bottom of last opening 37 ft. Well filled in from original depth of 42.3 ft, cased to 32 ft (screen, 32 ft to 37 ft).
DATUM.--Land-surface datum is 236.41 ft above North American Vertical Datum of 1988. Measuring point: Top of casing, 3.41 ft above land-surface datum, Jul. 29, 2002 to Jul. 14, 2012; Top of shelter shelf, 3.45 ft above land-surface datum, Aug. 20, 2013 to Oct. 17, 2023; Top of shelter shelf, 3.47 ft above land-surface datum, Oct. 17, 2023 to present.  
PERIOD OF RECORD.--July 2002 to current year.
GAGE.--Water-stage recorder--15 minute; periodic manual measurements by USGS personnel.
REMARKS.--Well was drilled in 2002 as a replacement for 414948074035101 (local number U 405), located about 3 ft west, which had a period of record from October 1964 to July 1965, March 1966 to December 1974, April 1976 to August 1995. Satellite water-level telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--Highest water level, 13.71 ft below land-surface datum, Sept. 13, 2011; lowest water level, 20.76 ft below land-surface datum, Oct. 10, 11, 2002.

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