Data set Code--AGW01

Title of Data Set--Belowground Water Chemistry from Wells on N04D

Abstract:
       In 1988 and 1990, the U.S. Geological Survey, Lawrence, KS, drilled 35 wells at 16
sites within the N04D watershed at the Konza Prairie Research Natural Area. The wells range
in depth from about 2 to 13 meters, and are nested to include wells completed i
n alluvium/colluvium near the N04D drainage and in two Permian-aged limestones. These sites
comprise four transects running approximately east-west across the drainage, and occupy the
lower 10% of the surface area of the watershed. The geology of the area is characterized by
patchy, near-stream alluvium/colluvium which overlies bedrock, composed of thin (1-2 meter)
limestones alternating with thicker (2-4 meter) shales. The limestones are fractured, and records
of water levels in the wells show that in some parts of the watershed water levels are nearly
constant, while in others they respond noticeably to precipitation events. Beginning in 1991,
water samples for inorganic chemical analysis have been collected every four to six weeks by
bailing wells to remove 1-2 well volumes. A bailed sample is then filtered through 0.45µ
membrane filters by gravity feed. One 50-mL aliquot is reserved for alkalinity determination
by titration with 0.02 N H2SO4. One 250-mL LDPE bottle is filled with 250 mL of sample
and 5 mL of concentrated HNO3 for cation analysis by atomic absorption spectrophotometry
(Na, K, Ca, Mg). One 250-mL LDPE bottle is filled to the brim for anion analysis by ion
chromatography (Cl, SO4, NO3). The latter two samples are stored on ice and later
in a refrigerator. Anion determination is completed within 1 to 3 days of collection.

Keywords that describe the data set: subsurface water chemistry, low-temperature aqueous
geochemistry, inorganic ground-water chemistry, chemical hydrogeology.

Date data commenced: 01/19/91
Date data terminated: / /
Principle Investigator: G. L. Macpherson

RECORD TYPE 1
Data Format Specification
Variable             Name                       Columns       Format       Units
1. Datacode                                     1-5           A5
2. Rectype                                      6             I1
3. Year                                         7-8           I2
4. Month                                        9-10          I2
5. Day                                          11-12         I2
6. Watershed  N04D (always)                     13-16         A4
7. Well_loc   Well location                     18-24         A7
8. N03        Concentration of N03              26-31         F5.2         mg/l
9. S04        Concentration of S04              33-39         F5.2         mg/l
10. Cl        Concentration of Cl               41-44         F4.1         mg/l
11. Titralk   Titration alkalinity (as HC03-)   46-49         I4           mg/l

Codes used:
Well_loc
Name          Code Value
ow            observation well
1-4           Transects (1-4) , the lowest number in nearest the concrete weir
1-6           Number unique to the well site (1 is nearest the steam;3 is farthest from the
              stream on the east or northeast side. Well site number 4-6 are progressively
              further away from the stream on the west or southwest side of the stream
Alpha chara.  Eis=Eiss Limestone
              Eis1=Lower Eiss Limestone
              Eis2=Upper Eiss Limestone
              Mor=Morril Limestone
              Al=Alluvium-colluvium.

Note:Files are NOT seperated by year.