U.S. Geological Survey
Water-Resources Investigations Report 98-4147
1-2 Maps showing:
1. Location of the study area, Twitchell Island,
Sacramento-San Joaquin Delta, California
2. Location of the lysimeters and piezometers in
the agricultural field study site, Twitchell Island, California
3-4 Schematics showing:
3. Typical installation of lysimeter and
piezometer pairs for sampling soil water from the upper and lower soil zones
4. Simplified conceptual hydrologic model of the
field studied
5. Graph showing specific conductance of
lysimeter samples, December 1995-January 1997
6. Schematic showing XAD isolation procedure
7-24 Graphs showing:
7. Dissolved organic carbon concentrations for
lysimeter samples, February 1996-January 1997
8. Dissolved oxygen concentrations for piezometer
samples, August 1996-April 1997
9. Redox potential measurements for piezometer
samples, August 1996-April 1997
10.Dissolved organic carbon concentrations for
piezometer samples, February 1996-January 1997
11. Specific conductance of piezometer samples,
December 1995-January 1997
12. Dissolved organic carbon concentrations in samples
from the drainage ditch, February 1996-January 1997
13.Specific ultraviolet absorbance for lysimeter,
piezometer, and drainage ditch samples, February 1996-January 1997
14. Fractionation of dissolved organic carbon into
hydrophobic and hydrophilic acids, for lysimeter, piezometer, and drainage
ditch samples, February 1996-January 1997
15. Comparison of reactivity-based and dose-based
trihalomethane formation potential measurement
16. Relation between trihalomethane formation potential
and dissolved organic carbon for lysimeter, piezometer, and drainage ditch
samples
17. Relation between ultraviolet absorbance and
trihalomethane formation potential for lysimeter, piezometer, and drainage
ditch samples
18. Relation between specific trihalomethane formation
potential and specific ultraviolet absorbance for lysimeter, piezometer, and
drainage ditch samples
19. Concentrations of trihalomethane formation potential
measurements for lysimeter samples, February 1996-January 1997
20. Concentrations of trihalomethane formation potential
for piezometer samples, February 1996-January 1997
21. Comparison of reactivity-based trihalomethane
formation potential measurements made by the California Department of Water
Resources and the U.S. Geological Survey
22. Specific trihalomethane formation potential of whole
water and hydrophobic and hydrophilic acid fractions, November 1996-January
1997
23. Specific ultraviolet absorbance of whole water and
hydrophobic and hydrophilic acid fractions, November 1996-January 1997
24. Aromatic composition of XAD isolates from lysimeter
and piezometer samples, November 1996-January 1997
C1, E1-E10. Graphs Showing:
C1. Dissolved organic carbon concentration as a function of volume of sample passed through 295-mL XAD columns for the piezometer 2 (Run 2) sample collected July 17, 1996
E1. Carbon-13 nuclear magnetic resonance spectra for the hydrophobic acid fraction from the drainage ditch sample collected March 1996
E2. Carbon-13 nuclear magnetic resonance spectra for the hydrophobic acid fraction from piezometer 3 sample collected March 1996
E3. Comparison of quantitative carbon-13 nuclear magnetic resonance integration data for hydrophobic acid fraction data from samples from Twitchell Island, California; the Suwannee River, Georgia; and Lake Fryxell, Antarctica
E4. Carbon-13 nuclear magnetic resonance spectra for the hydrophobic acid fraction from piezometer 4 sample collected July 17, 1996
E5. Representative carbon-13 nuclear magnetic resonance spectra for the hydrophilic acid fraction from piezometer 4 sample collected July 17, 1996
E6. Comparison of carbon-13 nuclear magnetic resonance data for hydrophobic and hydrophilic acid fractions from piezometer 4 sample collected July 17, 1996
E7. Comparison of carbon-13 nuclear magnetic resonance data for hydrophobic acid fraction from piezometers 1, 2, and 4, drainage ditch, and pump samples collected July 17, 1996
E8. Comparison of carbon-13 nuclear magnetic resonance data for hydrophilic acid fraction from piezometers 2 and 4, drainage ditch, and pump samples collected July 17, 1996
E9. Comparison of carbon-13 nuclear magnetic resonance data for soil samples taken near lysimeters 2 and 4 and piezometers 2 and 4
E10. Carbon-13 nuclear magnetic resonance spectra for soil samples taken near piezometer 2 and lysimeter 2
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WRIR 98-4147 Table of Contents
USGS Water Resources of California
URL: http://ca.water.usgs.gov/rep/wrir984147/tables.html
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