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2004 Denver Annual Meeting (November 7–10, 2004)

Session No. 137
Tuesday, 9 November 2004: 8:00 AM-12:00 PM

T21. Vadose Zone Nitrogen: Sources, Fate, and Transport

GSA Hydrogeology Division; GSA Geobiology and Geomicrobiology Division

 

Scott W. Tyler and W. Mike Edwards, Advocates
Paper #
Start Time
 
8:00 AM
Introductory Remarks
1
8:05 AM
THE UNSATURATED ZONE: KEY TO THE PAST, GUIDE TO THE FUTURE
KINNIBURGH, David G., British Geol Survey, Wallingford, OX10 8BB and COOPER, David M., Centre for Ecology and Hydrology, Wallingford, OX10 8BB, dgk@bgs.ac.uk, dgk@bgs.ac.uk
2
8:25 AM
SOURCES AND ISOTOPIC CHARACTERISTICS OF VADOSE-ZONE NITRATE IN ARID REGIONS
BÖHLKE, J.K., U.S. Geol Survey, 431 National Center, Reston, VA 20192, MICHALSKI, Greg, Chemistry and Biochemistry, Univ of California at San Diego, La Jolla, CA 92093, MCMAHON, Peter B., U.S. Geol Survey, Denver Federal Center, P.O. Box 25046, MS-415, Denver, CO 80225 and DENSMORE, Jill N., U.S. Geol Survey, 6000 J Street, Sacramento, CA 95819, jkbohlke@usgs.gov, jkbohlke@usgs.gov
3
8:45 AM
NITRATE ENRICHMENT IN THE VADOSE ZONE AND DEEP GROUNDWATERS OF NORTHERN AFRICA
EDMUNDS, W. Michael, Oxford Centre for Water Research, Oxford Univ, 2 Mansfield Road, Oxford, OX1 3TB, wme@btopenworld.com, wme@btopenworld.com
4
9:00 AM
USE OF NITROGEN STABLE ISOTOPES TO UNDERSTAND HYDROLOGIC AND GEOCHEMICAL PROCESSES IN SEMIARID VADOSE ZONES
NEWMAN, Brent D.1, COUNCE, Dale A.2, FESSENDEN-RAHN, Julianna3, HEIKOOP, Jeffrey M.2, HICKMOTT, Donald D.2, KLUK, Emily C.2 and LONGMIRE, Patrick2, (1)EES-2, Los Alamos National Lab, Los Alamos, NM 87544, (2)EES-6, Los Alamos National Lab, MS D469, Los Alamos, NM 87544, (3)Earth and Environmental Sciences Division, Los Alamos National Lab, Los Alamos, NM 87545, bnewman@lanl.gov, bnewman@lanl.gov
5
9:15 AM
CONNECTING VADOSE ZONE NITRATE TO GROUNDWATER CONTAMINATION AT THE HANFORD SITE WITH STABLE ISOTOPES
SINGETON, Michael J1, CONRAD, Mark1, WOODS, Katharine1, DEPAOLO, Donald1 and DRESEL, P. Evan2, (1)Center for Isotope Geochemistry, Lawrence Berkeley National Lab, 1 Cyclotron RD, BLDG 70A4418, Berkeley, CA 94720, (2)Pacific Northwest National Lab, Richland, WA 99352, mjsingleton@lbl.gov, mjsingleton@lbl.gov
6
9:30 AM
NITROUS OXIDE PRODUCTION RATES DERIVED FROM MEASUREMENTS OF N2O IN THE THICK UNSATURATED ZONE OF THE HIGH PLAINS AQUIFER, USA
WEEKS, Edwin P., U.S. Geol Survey, Mail Stop 413, Denver Federal Center, Denver, CO 80225, MCMAHON, Peter B., U.S. Geol Survey, Denver Federal Center, P.O. Box 25046, MS-415, Denver, CO 80225, DENNEHY, Kevin F., U.S. Geol Survey, 411 National Center, Reston, VA 20192 and GURDAK, Jason J., U. S. Geol Survey, Denver Federal center, P. O. Box 25046, MS-415, Denver, CO 80225, epweeks@usgs.gov, epweeks@usgs.gov
 
9:45 AM
Break
7
10:00 AM
NITRATE RETENTION BENEATH NITROGEN-LIMITED VEGETATION IN ARID AND SEMIARID ENVIRONMENTS AND IMPLICATIONS FOR RAPID MOBILIZATION
WALVOORD, Michelle A., USGS, DFC, Box 25046, MS-413, Lakewood, CO 80225, PHILLIPS, Fred M., Earth and Environmental Science Department, New Mexico Institute of Mining and Technology, Socorro, NM 87801, STONESTROM, David A., USGS, Menlo Park, CA 94025, EVANS, R. Dave, School of Biological Sciences, Washington State Univ, Pullman, WA 99164, HARTSOUGH, Peter C., Desert Research Institute, Reno, NV 89512-1095, NEWMAN, Brent D., EES-2, Los Alamos National Lab, Los Alamos, NM 87544 and STRIEGL, Robert G., USGS, Lakewood, CO 80225, walvoord@usgs.gov, walvoord@usgs.gov
8
10:20 AM
IMPACTS OF VADOSE ZONE NITROGEN ON AQUIFER STORAGE AND RECOVERY SYSTEMS
TYLER, Scott W., Depts. of Geological Sciences & Natural Resources and Environmental Sciences, Univ of Nevada, Reno, MS 175, Reno, NV 89557, tylers@unr.edu, tylers@unr.edu
9
10:35 AM
A GEOSPATIAL METHOD FOR IDENTIFYING NITRATE AND DISSOLVED-SOLIDS SOURCES IN GROUND WATER: A CASE STUDY FROM CARSON VALLEY, NEVADA, USA
SHIPLEY, Douglas O. and ROSEN, Michael R., US Geol Survey, 333 W. Nye Lane, Carson City, NV 89706, dshipley@usgs.gov, dshipley@usgs.gov
10
10:50 AM
IMPLICATIONS OF TEMPORAL AND SPATIAL VARIABILITY IN NITRATE-N CONCENTRATIONS DERIVED FROM SOIL-WATER SAMPLERS AND SOIL CORES IN THE VADOSE ZONE OF SOUTH-CENTRAL KANSAS
TOWNSEND, M.A., Kansas Geological Survey, Univ of Kansas, 1930 Constant Ave, Lawrence, KS 66047 and SLEEZER, Richard O., Earth Science Department, Emporia State Univ, Campus Box 4030, Emporia, KS 66801-5087, townsend@kgs.ku.edu, townsend@kgs.ku.edu
11
11:05 AM
SEPTIC NITRATE CONTAMINATION OF MUNICIPAL WATER SUPPLY WELLS: TRENDS AND REMEDIAL EFFORTS
KROPF, Christian A.1, DRAGAN, Dan1 and ROSEN, Michael2, (1)Department of Water Resources, Washoe County, 4930 Energy Way, Reno, NV 89502, (2)NAWQA, USGS, 333 West Nye Lane, Carson City, NV 89706, ckropf@mail.co.washoe.nv.us, ckropf@mail.co.washoe.nv.us
 
11:20 AM
Discussion
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