LOCATION.--Lat 40°58'20", long 93°25'25"
referenced to North American Datum of 1983, in NE 1/4 SE 1/4 SE 1/4
sec.6, T.71 N., R.22 W., Lucas County, IA, Hydrologic Unit 10280201,
900 ft north of the intersection of 170th Avenue and 450th Street,
and 3.0 mi northeast of Derby. (map)
GROUNDWATER RECORDS
WELL CHARACTERISTICS.--Depth 27.3 ft. Upper casing diameter 2 in;
top of first opening 19.7 ft, bottom of last opening 24.7. Drilled
observation well, cased to 27.3 ft. All depths below land-surface
datum.
DATUM.--Land-surface datum is 1,071.38 ft above North American
Vertical Datum of 1988. Measuring point: top of casing, 1.80 ft above
land-surface datum, May 14, 2008, to present. Land-surface datum from
levels.
PERIOD OF RECORD.--Water-level measurements, water years
2009-2015.
PERIOD OF DAILY RECORD.--Water-level records from April 2009 to
February 2011, May 2011 to October 2014.
GAGE.--Water-level recorder.