LOCATION.--Lat 41°18'42.6", long 92°10'50.9"
referenced to North American Datum of 1983, in NW 1/4 SW 1/4 SW 1/4
sec.7, T.75 N., R.11 W., Keokuk County, IA, Hydrologic Unit 07080106,
0.8 mi south from intersection of 220th Avenue and 230th Street, and
1.2 mi southeast of Sigourney. (map)
GROUNDWATER RECORDS
WELL CHARACTERISTICS.--Depth 26 ft. Upper casing diameter 2 in;
top of first opening 21 ft, bottom of last opening 26 ft. Drilled
observation well, cased to 21 ft. All depths below land-surface
datum.
DATUM.--Land-surface datum is 678.92 ft above North American
Vertical Datum of 1988. Measuring point: top of casing, 3.20 ft above
land-surface datum, April 17, 1997, to present. Land-surface datum
from levels.
PERIOD OF RECORD.--Water-level measurements, water years 1997,
1999, 2005, 2007, 2009-2015.
PERIOD OF DAILY RECORD.--Water-level records from November 2012 to
May 2015.
GAGE.--Water-level recorder.
WATER-QUALITY RECORDS
PERIOD OF RECORD.--Water years 1997, 2007.
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