Geoffrey Delin

Biography

I am a Groundwater Specialist on the Water Science Field Team covering the Central part of the United States, including the USGS Southwest Region and the western half of the Midwest Region. I began my USGS career in the Minnesota Water Science Center in 1979 as a hydrologic technician.  As a hydrologist I conducted numerous groundwater quantity and quality investigations on glacial and bedrock aquifers and frequently used groundwater flow and transport models. As a research hydrologist in recent years I evaluated the fate and transport of agricultural chemicals through unsaturated and saturated deposits, developed and evaluated methods for estimating groundwater recharge, evaluated the effects of recharge on crude-oil dissolution, and researched vapor-phase transport of volatile hydrocarbons. Before joining the USGS Water Discipline, I worked as a professional geologist for an engineering consulting firm in Minnesota for two years. In my free time I enjoy hiking, bicycling, golfing, skiing, tennis, and traveling.

 

JOURNAL ARTICLES

  1. Delin, G.N., 1995, Aquifer test in a complex drift aquifer system, west-central Minnesota: Hydrological Science and Technology, Vol. 11, No. 1-4, pp. 1-13.
  2. Delin, G.N., and Landon, M.K., 1996, Multiport well design for sampling of ground water at closely-spaced vertical intervals: Ground Water, Vol. 34, No. 6, pp. 1098-1104.
  3. Delin, G.N., Healy, R.W., Landon, M.K., and Böhlke, J.K., 2000, Effects of topography and soil properties on recharge at two sites in an agricultural field: Journal of the American Water Resources Association, v. 36, no. 6, 1401-1416.
  4. Delin, G.N., and Landon, M.K., 2002, Effects of surface run-off on the transport of agricultural chemicals to ground water in a sandplain setting: Science of the Total Environment, v. 295, 143-155.
  5. Delin, G.N., and Landon, M.K., 2002, Effects of topography on the transport of agricultural chemicals to ground water in a sand-plain setting: Hydrogeology Journal, v. 10, 443-454.
  6. Delin, G.N., and Herkelrath, W.N., 2005, Use of soil-moisture probes to estimate ground-water recharge at an oil-spill site: Journal of American Water Resources Association, v. 41, no. 6, 1259-1277.
  7. Delin, G.N., Healy, R.W., Lorenz, D.L., and Nimmo, J.R., 2007, Comparison of local- to regional-scale estimates of ground-water recharge in Minnesota, USA: Journal of Hydrology, v. 334, no. 1-2, p. 231-249.
  8. Delin, G.N. and Herkelrath, W.N., 2014, Effects of a dual-pump crude-oil recovery system, Bemidji, Minnesota, USA: Groundwater Monitoring and Remediation, v. 34, no. 1, p. 57-67. http://onlinelibrary.wiley.com/doi/10.1111/gwmr.12040/pdf.
  9. Delin, G.N. and Herkelrath, W.N., in review, Effects of crude oil on water and tracer movement in the unsaturated and saturated zones: to be submitted to Journal of Hydrology, 37 p.
  10. Amos, R.T., Mayer, K.U., Bekins, B.A., Delin, G.N., Williams, R.L., 2005, Use of dissolved and vapor-phase gases to investigate methanogenic degradation of petroleum hydrocarbon contamination in the subsurface, Water Resources Research, v. 41, no. 2, W02001.
  11. Amos, R.T., Bekins, B.A., Delin, G.N., Cozzarelli, I.M., Blowes, D.W., Kirshtein, J.D., 2011, Methane oxidation in a crude oil contaminated aquifer: Delineation of aerobic reactions at the plume fringes, Journal of Contaminant Hydrology. doi:10.1016/j.jconhyd.2011.04.003.
  12. Baedecker, M.J., Eganhouse, R.P., Bekins, B.A., Delin, G.N., 2011, Loss of volatile hydrocarbons from and LNAPL oil source, Journal of Contaminant Hydrology, 126, 140-152.
  13. Bekins, B.A., Hostettler, F.D., Herkelrath, W.N., Delin, G.N., Warren, Ean, and Essaid, H.I., 2005, Progression of Methanogenic Degradation of Crude Oil in the Subsurface, Environmental Geosciences, v. 12, no. 2, pp. 139-152.
  14. Böhlke, J.K., Wanty, R., Tuttle, M., Delin, G., and Landon, M., 2002, Denitrification in the recharge area and discharge area of a transient agricultural nitrate plume in a glacial outwash sand aquifer, Minnesota: Water Resources Research, v. 38, no. 7, 26 p.
  15. Chaplin, B. P., G. N. Delin, R.J. Baker, M.A. Lahvis. 2002. Long term evolution of biodegradation and volatilization rates in a crude-oil-contaminated aquifer: Bioremediation Journal, vol. 6, no. 3, 237-255.
  16. Essaid, H.I., B.A. Bekins, W.N. Herkelrath, G.N. Delin. 2011. Crude Oil at the Bemidji Site: 25 Years of Monitoring, Modeling, and Understanding. Ground Water 49, no. 5: 706-726.
  17. Essaid, H.I., Cozzarelli, I.M., Eganhouse, R.P., Herkelrath, W.N., Bekins, B.A., and Delin, G.N., 2003, Inverse modeling of BTEX dissolution and biodegradation at the Bemidji, MN crude-oil spill site: Journal of Contaminant Hydrology, v. 67, p. 269-299.  
  18. Lorenz, D.L., and Delin, G.N., 2007, A regression model to estimate regional ground-water recharge in Minnesota: Ground Water, v. 45, no. 2, p. 196-208.
  19. Capel, P.D., Kruglov, Victoria, Landon, M.K., Delin, G.N., and Certain, H.J, 2002, Variations in the concentrations of atrazine, de-ethylatrazine, and nitrate during well purging in relation to field water-quality parameters: Hydrological Science and Technology, Vol. 18, No. 1-4, 217-230.
  20. Herkelrath, W.N., and Delin, G.N., in preparation, Complexities of an aquifer test in a crude oil contaminated aquifer: to be submitted to Journal of Hydrology.
  21. Landon, M.K., Delin, G.N., Komor, S.C., and Regan, C.P., 1999, Comparison of the stable-isotopic composition of soil water collected from suction lysimeters, wick samplers, and cores in a sandy unsaturated zone: Journal of Hydrology, vol. 224, p. 45-54.
  22. Landon, M.K., Delin, G.N., Komor, S.C., and Regan, C.P., 2000, Relation of pathways and transit times of recharge water to nitrate concentrations using stable isotopes: Ground Water, vol. 38, no. 3, p. 381-395. 
  23. Mewafy, F.M., Atkwana, E.A., Werkema Jr., D.D., Slater, L.D., Ntarlagiannis, Dimitrios, Revil, Andre, Skold, magnus, Delin, G.N., 2011, Magnetic Susceptibility as a Proxy for Investigating Microbially Mediated Iron Reduction, Geophysical Research Letters, doi:10.1029/2011GL049271.
  24. Rosenberry, D.O., Briggs, M.A., Delin, G.N., and Hare, D.K., 2016, Combined use of thermal methods and seepage meters to efficiently locate, quantify, and monitor focused groundwater discharge to a sand-bed stream: Water Resources Research, vol. 52, no 6, 4486-4503. DOI: 10.1002/2016WR018808
  25. Sihota, N.J., Trost, J.J., Bekins, B.A., Berg, A., Delin, G.N., Mason, B., Warren, E.A., and Mayer, K.U., 2016, Seasonal Variability in Vadose Zone Biodegradation at a Crude Oil Pipeline Rupture Site Vadose Zone Journal, vol. 15, no. 5, 14 p. DOI:10.2136/vzj2015.09.0125
  26. Strobel, M.L., Strobel, C.J., and Delin, G.N., 1998, Design for a packer/vacuum slug test system for estimating hydraulic conductivity in wells with LNAPLs, casing leaks, or water tables intersecting the screens: Ground Water Monitoring and Remediation, vol. 18, no. 4, p. 77-80.

 

 

USGS PROFESSIONAL PAPERS

 

  1. Miller, R.T., and Delin, G.N., 1993, Field observations, preliminary model analysis, and aquifer thermal efficiency: U.S. Geological Survey Professional Paper 1530, 55 p.
  2. Miller, R. T., and Delin, G. N., 2002, Cyclic injection, storage, and withdrawal of heated water in a sandstone aquifer at St. Paul, Minnesota--Thermal data analysis and nonisothermal modeling of short-term test cycles: U.S. Geological Survey Professional Paper 1530-B, 66 p.
  3. Delin, G. N., Hoyer, M. C., Winterstein, T. C., and Miller, R.T., 2002, Cyclic injection, storage, and withdrawal of heated water in a sandstone aquifer at St. Paul, Minnesota--Thermal data analysis and nonisothermal modeling of long-term test cycles: U.S. Geological Survey Professional Paper 1530-C, 81 p.

 

 

USGS WATER SUPPLY PAPERS

 

  1. Delin, G.N., and Woodward, D.G., 1984, Hydrogeologic setting and the potentiometric surfaces of regional aquifers in the Hollandale Embayment, southeastern Minnesota: U.S. Geological Survey Water-Supply Paper 2219, 56 p.
  2. Delin, G.N., and Almendinger, J.E., 1993, Delineation of recharge areas for selected wells in the St. Peter-Prairie du Chien-Jordan aquifer, Rochester, Minnesota: U.S. Geological Survey Water-Supply Paper 2397, 39 p.

 

 

USGS WATER RESOURCES INVESTIGATIONS AND SCIENTIFIC INVESTIGATION REPORTS

 

  1. Delin, G.N., 1986, Hydrogeology of confined-drift aquifers near the Pomme de Terre and Chippewa Rivers, western Minnesota: U.S. Geological Survey Water-Resources Investigations Report WRIR 86-4098, 90 p.
  2. Delin, G.N., 1986, Evaluation of availability of water from drift aquifers near the Pomme de Terre and Chippewa Rivers, western Minnesota: U.S. Geological Survey Water-Resources Investigations Report WRIR 86-4321, 62 p.
  3. Delin, G.N., 1990, Geohydrology and water quality of confined glacial-drift aquifers in the Brooten-Belgrade area, west-central Minnesota: U.S. Geological Survey Water-Resources Investigations Report WRIR 88-4124, 141 p.
  4. Delin, G.N., 1991, Simulation of effects of ground-water development on water levels in glacial-drift aquifers in the Brooten-Belgrade area, west-central Minnesota: U.S. Geological Survey Water-Resources Investigations Report, WRIR 88-4193, 67 p.
  5. Delin, G.N., 1990, Hydrogeology and simulation of ground-water flow in the Rochester area, southeastern Minnesota, 1987-88: U.S. Geological Survey Water Resources Investigations Report, WRIR 90-4081, 101 p.
  6. Delin, G. N., Anderson, J.L., and Dowdy, R.H., 1991, Integrated hydrologic research at the northern cornbelt sand-plain management systems evaluation area: in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water Resources Investigations Report 91-4034, p. 214-218.
  7. Delin, G.N. Herkelrath, W.N., and Trost, J.J., in review, Effects of a dual-pump crude oil recovery system, Bemidji, Minnesota, USA: U.S. Geological Survey Scientific Investigations Report 201_-XXXX, 55 p.
  8. Delin, G.N., Landon, M.K., Lamb, J.A., and Anderson, J.L., 1994, Characterization of the hydrogeology and water quality at the Management Systems Evaluation Area near Princeton, Minnesota: U.S. Geological Survey Water Resources Investigations Report 94-4149, 54 p.
  9. Delin, G.N., and Landon, M.K., 1995, Effects of topography on the transport of agricultural chemicals near Princeton, Minnesota, 1992: in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water Resources Investigations Report 94-4015, vol. 1, p. 555-564.
  10. Delin, G.N., Landon, M.K., Healy, R.W., and Olsen, H.W., 1995, Spatial variability of unsaturated-zone properties in relation to topography in a sand-plain setting near Princeton, Minnesota: in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water Resources Investigations Report 94-4015, vol. 1, p. 565-574.
  11. Delin, G.N., Landon, M.K., Lamb, J.A., and Dowdy, R.H., 1995, Effects of 1992 farming systems on ground-water quality at the management systems evaluation area near Princeton, Minnesota: U.S. Geological Survey Water Resources Investigations Report 95-4104, 23 p.
  12. Delin, G.N., and Herkelrath, W.N., 1999, Ground water contamination by crude oil: in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: U.S. Geological Survey Water Resources Investigations Report 99-4018C, vol. 3 section B, p. 121-122.
  13. Delin, G.N., and Herkelrath, W.N., 1999, Long-term monitoring of unsaturated-zone properties to estimate recharge at the Bemidji crude-oil spill site: in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: U.S. Geological Survey Water Resources Investigations Report 99-4018C, vol. 3 section B, p. 143-152.
  14. Drennan, D.M., Bekins, B.A., Warren, E., Cozzarelli, I.M., Baedecker, M.J., Herkelrath, W.N., and Delin, G.N., 2010, Fate and Transport of Petroleum Hydrocarbons in the Subsurface near Cass Lake, Minnesota: U.S. Geological Survey Scientific Investigations Report 2010-5085, 40 p.
  15. Hostettler, F.D., Rostad, C.E., Kvenvolden, K.A., Delin, G.N., Putnam, LD., Kolak, J.J., Chaplin, B.P., and Schaap, B.D., 2001, Hydrologic setting and geochemical characterization of free-phase hydrocarbons in the alluvial aquifer at Mandan, North Dakota, November 2000: U.S. Geological Survey Water Resources Investigations Report 01-4108, 117 p.
  16. Landon, M.K., and Delin, G.N., 1995, Ground-water quality in agricultural areas, Anoka sand plain aquifer, east-central Minnesota, 1984-90: U.S. Geological Survey Water Resources Investigations Report 95-4024, 25 p.
  17. Landon, M.K., Delin, G.N., Lamb, J.A., Dowdy, R.H., and Anderson, J.L., 1995, Effects of farming systems on ground-water quality at the Princeton, Minnesota Management Systems Evaluation Area, 1991: in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water Resources Investigations Report 94-4015, vol 1., p. 543-554.
  18. Landon, M.K., Delin, G.N., Lamb, J.A., Anderson, J.L., and Dowdy, R.H., 1998, Effects of farming systems on ground-water quality at the Management Systems Evaluation Area near Princeton, Minnesota 1991-95: U.S. Geological Survey Resources Investigations Report 98-4128, 51 p.
  19. Strobel, M.L., Delin, G.N., and Munson, C.J., 1998, Spatial variation in saturated hydraulic conductivity of sediments at a crude-oil spill site near Bemidji, Minnesota: U.S. Geological Survey Water-Resources Investigations Report 98-4053, 13 p.
  20. Wanty, R.B., Tuttle, M.L., Landon, M.K., Delin, G.N., and Böhlke, J.K., 1995, Geochemistry of nitrogen in a farmed watershed near Princeton, Minnesota: in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water Resources Investigations Report 94-4015, vol. 1, p. 591-596.

 

 

USGS OPEN-FILE REPORTS AND FACT SHEETS

 

  1. Delin, G.N., 1985, Confined drift aquifers studied near the Pomme de Terre and Chippewa Rivers, west-central Minnesota: U.S. Geological Survey Water Fact Sheet, 2 p.
  2. Delin, G.N., 1986, Confined-drift aquifers in Minnesota: U.S. Geological Survey Open-File Report 86-240, 2 p.
  3. Delin, G.N., 1990, Delineation of recharge areas for selected wells in the St. Peter-Prairie du Chien-Jordan aquifer, Rochester, Minnesota, U.S. Geological Survey Open-File Report 90-397, 60 p.
  4. Delin, G.N., Landon, M.K., Anderson, J.L., and Dowdy, R.H., 1992, Hydrologic research at the Princeton, Minnesota management systems evaluation area: U.S. Geological Survey, Open-File Report 92-107, 2 p.
  5. Delin, G.N., and Landon, M.K., 1993, Effects of focused recharge on the transport of agricultural chemicals at the Princeton, Minnesota management systems evaluation area: U.S. Geological Survey Open-File Report 93-42, 8 p.
  6. Delin, G.N., and Landon, M.K., 1993, Effects of recharge on the transport of agricultural chemicals at the Princeton, Minn. management systems evaluation area, 1991-92: U.S. Geological Survey, Open-File Report 93-79, 2 p.
  7. Delin, G.N., Landon, M.K., Lamb, J.A., and Anderson, J.L., 1994, Hydrogeologic and water-quality data used to characterize the Management Systems Evaluation Area near Princeton, Minnesota: U.S. Geological Survey Open-File Report 94-337, 45 p.
  8. Delin, G.N., Landon, M.K., Nelson, K.J., Wanty, R.B., Healy, R.W., Olsen, H.W., Böhlke, J.K., Schroyer, B.R., and Capel, P.D., 1997, Hydrogeologic and water-quality data used to evaluate the effects of focused recharge ground-water quality near Princeton, Minnesota, 1991-95: U.S. Geological Survey Open-File Report 97-21, 30 p.
  9. Delin, G.N., Essaid, H.I., Cozzarelli, I.M., Lahvis, M.H., and Bekins, B.A., 1998, Ground-water contamination by crude oil near Bemidji, Minnesota: U.S. Geological Survey Fact Sheet 084-98, 4 p.
  10. Delin, G.N., and Herkelrath, W.N., 1999, Long-term monitoring of unsaturated-zone properties to estimate recharge at the Bemidji crude-oil spill site, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 3 of 3—Subsurface Contamination from Point Sources: U.S. Geological Survey Water-Resources Investigations Report 99-4018C, p. 143-152.
  11. Delin, G.N., and Falteisek, J.D., 2007, Ground-water recharge in Minnesota. U.S. Geological Survey Fact Sheet 2007-3002, 6 p.
  12. Delin, G.N., and Risser, D.W., 2007, Ground-water recharge in humid areas of the United States: A summary of ground-water resources program studies, 2003-2006, United States Geological Survey Fact Sheet 2007-3007, 4 p.
  13. Oden, T.D., and Delin, G.N., 2013, Groundwater recharge to the Gulf Coast aquifer system in Montgomery and Adjacent Counties, Texas: U.S Geological Survey Fact Sheet 2013-3043, 6 p.
  14. Landon, M.K., Delin, G.N., Lamb, J.A., and Guo, L., 1993, Ground-water quality at the management systems evaluation area (MSEA) near Princeton, Minnesota, 1991: U.S. Geological Survey Open-File Report 93-43, 8 p.
  15. Landon, M.K., Delin, G.N., Lamb, J.A., and Guo, L., 1993, Ground-water quality at the management systems evaluation area near Princeton, Minnesota, 1991: U.S. Geological Survey, Open-File Report 93-80, 2 p.
  16. Miller, R. T., and Delin, G. N., 1993, Cyclic injection, storage, and withdrawal of heated water in a sandstone aquifer at St. Paul, Minnesota: Thermal data analysis and nonisothermal modeling of short-term test cycles: U.S. Geological Survey Open-File Report 93-435, 117 p.
  17. Strobel, M.L., and Delin, G.N., 1996, Analysis of hydrogeologic properties in the Prairie du Chien-Jordan aquifer, Shakopee Mdewakanton Sioux Community, southeastern Minnesota: U.S. Geological Survey Open-File Report 96-182, 14 p.
  18. Landon, M.K., Delin, G.N., Nelson, K.J., Regan, C.P., Lamb, J.A., Larson, S.J., Capel, P.D., Anderson, J.L., and Dowdy, R.H., 1997, Water-quality and hydrogeologic data used to evaluate the effects of farming systems on ground-water quality at the Management Systems Evaluation Area near Princeton, Minnesota, 1991-95: U.S. Geological Survey Open-File Report 97-22, 31 p.
  19. Oden, T.D., and Delin, G.N., 2013, Groundwater recharge to the Gulf Coast aquifer system in Montgomery and Adjacent Counties, Texas: U.S. Geological Survey Fact Sheet 2013–3043, 6 p., http://pubs.usgs.gov/fs/2013/3043/
  20. Wilkison, Don, and Delin, G.N., 1998, U.S. Geological Survey Research at management Systems Evaluation Areas, 1991-1995: U.S. Geological Survey Fact Sheet 042-98, 4 p.

 

 

CONFERENCE PROCEEDINGS AND ABSTRACTS

 

  1. Delin, G.N., 1986, Hydrogeology of confined-drift aquifers in a part of west-central Minnesota:  20th Annual Mtg., North-Central Section, Geological Society of America, April 23-25, 1986, p. 286.
  2. Delin, G.N., 1987, Ground-water quality in a complex system of glacial drift aquifers, west-central Minnesota:  Midwest Groundwater Conference Proceedings, October 29, 1987, 1 p.
  3. Delin, G.N., 1990, Hydrologic considerations for delineating groundwater recharge areas for wells, Rochester, Minnesota: Minnesota Water 1990, Conference Proceedings, St. Paul, Minn., April 9-10, 1990, 1 p.
  4. Delin, G.N., 1990, Effects of differing agricultural practices on concentrations of nitrate and atrazine in a sand-plain aquifer, western Minnesota: in EOS, Transactions, American Geophysical Union, Vol. 71, No. 43, p. 1329, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 3-7, 1990.
  5. Delin, G. N., 1991, Aquifer research at the management systems evaluation areas: in The President's Water Quality Initiative: Interagency progress and perspectives, Arlington, VA, February 6-7, 1991, 1 p.
  6. Delin, G.N., 2002, Nineteen years of research at the Bemidji, Minnesota crude-oil spill site: abstract in the Proceedings of the Midwest Ground Water Conference, Fargo, North Dakota, October 2-4, 2002.
  7. Delin, G.N., 2004, Real-time ground-water level and streamflow data acquisition: Minnesota Ground Water Association Fall Conference 2004, November 16, 2004, University of Minnesota continuing Education and Conference Center, St. Paul.
  8. Delin, G.N., 2005, Contributions by Dr. Hans Olaf Pfannkuch at the Bemidji, Minnesota crude-oil spill research site, Geological Society of America Annual Meeting, Salt Lake City, Utah, October 16-19, 2005.
  9. Delin, G.N., 2005, Use of environmental tracers to age date recently recharged ground water, Minnesota Ground Water Association Fall Meeting, November 17, 2005, University of Minnesota continuing Education and Conference Center, St. Paul.
  10. Delin, G.N., 2007, Crude oil fate and transport research over 24 years, Bemidji, Minnesota, The Ninth International In Situ and On-Site Bioremediation Symposium, Baltimore, Maryland, May 7-10, 2007
  11. Delin, G.N., Chaplin, B.P., and Lahvis, M.A., 2001, Long-term changes in biodegradation and volatilization rates in the capillary fringe at the Bemidji, Minnesota Crude-oil research site: in EOS, Transactions, American Geophysical Union, Vol. 84, No. 47, p. F515, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 10-14, 2001.
  12. Delin, G.N., and Herkelrath, W.N., 1998, Long-term monitoring of soil moisture using CS615 reflectometer probes, in 1998 Fall Meeting Supplement, San Francisco, California, December 6-10, 1998: in EOS, Transactions of American Geophysical Union, v. 79, no. 45, p. F368.
  13. Delin, G.N., and Herkelrath, W.N., 1999, Long-term monitoring of unsaturated-zone properties at the Bemidji crude-oil spill site: poster presented at the American Institute of Hydrology annual meeting, Hydrologic Issues for the 21st Century, San Francisco, CA, November 7-11, 1999.
  14. Delin, G.N., and Herkelrath, W.N., 2001, Long-term monitoring of soil-moisture in a harsh climate using reflectometer and TDR probes: in Proceedings of the Second International Symposium and Workshop on Time Domain Reflectometry for Innovative Geotechnical Applications, Northwestern University, September 5-7, 2001, pp. 262–272.
  15. Delin, G.N., and Herkelrath, W.N., 2012, Effects of remediating a crude-oil contaminated aquifer, Bemidji, Minnesota, USA, Integrated Petroleum Environmental Consortium (IPEC) Conference, Denver, CO, November 1, 2012.
  16. Delin, G.N., Herkelrath, W.N., and Lounsbury, S.W., 2008, Monitoring dual-pump remediation of a crude-oil spill site, The Sixth International Remediation of Chlorinated and Recalcitrant Compounds Conference, Monterey, California, May 19-22, 2008.
  17. Delin, G.N., Herkelrath, W.N., and Lounsbury, S.W., 2008, Monitoring of remediation at the Bemidji, Minnesota, USA crude-oil spill site: IAHR International Groundwater Symposium – Flow and Transport in Heterogeneous Subsurface Formations: Theory, Modeling, & Applications, June 18-20, 2008, Istanbul Turkey.
  18. Delin, G.N., Herkelrath, W.N., and Lounsbury, S.W., 2009, Effects of remediation at the Bemidji, Minnesota Crude-oil spill site, USGS Toxics Substances Hydrology Meeting, San Diego, CA, January 26-30, 2009.
  19. Delin, G.N., Herkelrath, W.N., and Lounsbury, S., 2009, Effects of dual-pump recovery on crude-oil contamination of groundwater, Bemidji, Minnesota: in EOS, Transactions, American Geophysical Union, 90(52), H24A-03, Fall Meeting Supplement, San Francisco, California, December 11-15, 2009.
  20. Delin, G. N., and Landon, M.K., 1993, Effects of focused recharge on the transport of agricultural chemicals at the Princeton, Minnesota management systems evaluation area-Preliminary results: Agricultural Research to Protect Water Quality Conference Proceedings: Minneapolis, Minnesota, February 21-24, 1993, pp. 210-214.
  21. Delin, G.N., and Landon, M.K., 1994, Effects of focused recharge on the transport of agricultural chemicals near Princeton, Minnesota: abstract for poster presented at the Minnesota Water '94 Conference: Minneapolis, Minnesota, April 21-22, 1994, 1 p.
  22. Delin, G. N., Landon, M.K., Anderson, J. L., and Dowdy, R. H., 1992, The Minnesota management systems evaluation area project - assessing the effects of agricultural practices on ground-water quality: abstract for talk presented at the Minnesota Water '92 Conference: Minneapolis, Minnesota, February 13-14, 1992, 1 p.
  23. Delin, G.N., Landon, M.K., Anderson, J.L., and Dowdy, R.H., 1992, The Minnesota management systems evaluation area: in Agronomy Abstracts, 1992 Annual Meetings American Society of  Agronomy, Minneapolis, MN, November 1-6, 1992, p. 322.
  24. Delin, G.N., Landon, M.K., Anderson, J.L., Lamb, J.A., and Dowdy, R.H., 1993, The Minnesota Management Systems Evaluation Area (MSEA) Project: abstract for talk presented at the Minnesota Water Resources Conference: St. Paul, Minnesota, October 26-27, 1993, 1 p.
  25. Delin, G.N., Landon, M.K., Anderson, J.L., Lamb, J.A., and Dowdy, R.H., 1995, Transport of agricultural chemicals to ground water Princeton, Minnesota, 1991-93: Clean Water - Clean Environment - 21st Century Conference Kansas City, Missouri, March 5-8, 1995, conference proceedings, Vol. 1, pp. 57-60.
  26. Delin, G.N., Landon, M.K., Anderson, J.L., Lamb, J.A., and Dowdy, R.H., 1996, Transport of agricultural chemicals to ground water in a sand-plain setting near Princeton, Minnesota, 1991-93: Geological Society of America - North-Central Section Meeting, Ames, Iowa, May 2-3, 1996, conference proceedings, Vol. 28, no. 6, p. 36.
  27. Delin, G.N., Landon, M.K., Böhlke, J.K., and Wanty, R.B., 1994, Comparison of recharge rates of water and agricultural chemicals at lowland and upland sites of a sand and gravel aquifer in central Minnesota: in EOS, Transactions, American Geophysical Union, Vol. 75, No. 44, p. 251, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 5-9, 1994.
  28. Delin, G. N., Landon, M.K., Healy, R.W., and Olsen, H.W., 1992, Preferential flow through the unsaturated zone beneath a corn field near Princeton, Minnesota: in EOS, Transactions, American Geophysical Union, Vol. 73, No. 14, p. 132, Proceedings of American Geophysical Union spring meeting, Montreal, Canada, May 12-16, 1992.
  29. Delin, G.N., Landon, M.K., Healy, R.W., and Olsen, H.W., 1994, Spatial distribution of unsaturated-zone properties in relation to topography near Princeton, Minnesota: abstract for poster presented at the Minnesota Water '94 Conference: Minneapolis, Minnesota, April 21-22, 1994, 1 p.
  30. Delin, G.N., Lorenz, D.L., Healy, R.W., Nimmo, J.R., Heppner, C., and Winter, T.C., 2005, Temporal and spatial variability of ground-water recharge in Minnesota using multiple methods, Geological Society of America North Central Section Meeting, Minneapolis, Minnesota, May 19-20, 2005.
  31. Delin, G.N., Healy, R.W., Lorenz, D.L., and Nimmo, J.R., 2008, Recharge estimation at local and regional scales – examples from Minnesota: Oklahoma Water Research Symposium, Oklahoma City, Oklahoma, October 28-30, 2008.
  32. Delin, G.N., and Herkelrath, W.N., 2010, Effects of LNAPL Removal from a Crude-Oil Contaminated Aquifer, Bemidji, Minnesota, USA: GQ10: Groundwater Quality Management in a Rapidly Changing World (Proc. 7th International Groundwater Quality Conference held in Zurich, Switzerland, 13–18 June 2010).
  33. Alexander, E.E., Jr., Guo, L., Landon, M.K., Delin, G.N., and Regan, C.P., 1994, Geochemical characteristics and transport of agricultural leachates in a sand-and-gravel aquifer near Princeton, Minnesota:  in proceedings of the conference Farming Sandy Soils - strategies for managing nutrients and pesticides in the upper midwest, March 1-2, 1994, St. Cloud, Minnesota, 1 p.
  34. Amos, R.T., Bekins, B.A., Cozzarelli, I.M., Voytek, M.A., Kirshtein, J., Delin, G.N., Blowes, D.W., 2008, Methane oxidation in a crude oil contaminated aquifer, Goldschmidt Conference.
  35. Amos, R.T., Mayer, K.U., Bekins, B.A., and Delin, G.N., 2003, Coupled Vapour Phase and Dissolved Gas Analysis to Elucidate Physical and Geochemical Processes in Reactive Zones: in EOS, Transactions, American Geophysical Union, Vol. 84, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 8-12, 2003.
  36. Amos, R.T., Mayer, K.U., Bekins, B.A., and Delin, G.N., 2004, Using dissolved and vapor phase gas analysis to investigate methanogenic degradation of petroleum hydrocarbons in variably saturated media. Geological Society of America Annual Meeting, Denver, Colorado, November 7–10, 2004.
  37. Amos, R.T., Molins, Sergi, Mayer, K.U., Bekins, B.A., Delin, G.N., 2004, Reactive transport modeling of methanogenic hydrocarbon degradation using dissolved and vapor phase gases as natural tracers. Groundwater Quality 2004 4th International Conference, July 19-22, 2004, University of Waterloo, Ontario, Canada.
  38. Anderson, J.L., and Delin, G.N., 1994, Unique hydrology of sand plain areas and water quality trends:  in proceedings of the conference Farming Sandy Soils - strategies for managing nutrients and pesticides in the upper midwest, March 1-2, 1994, St. Cloud, Minnesota, 1 p.
  39. Anderson, J.L., Delin, G.N., Dowdy, R.H., and Lamb, J.A., 1992, Crop system effects on groundwater quality in the northern corn belt sand plains: in Agronomy Abstracts, 1992 Annual Meetings American Society of Agronomy, Minneapolis, MN, November 1-6, 1992, p. 31.
  40. Anderson, J.L., Dowdy, R.H., and Delin, G.N., 1991, Ground water impacts from irrigated ridge-tillage, in Ritter, W.R., ed., 1991, National Conference on Irrigation and Drainage Engineering, American Society of Civil Engineers, Honolulu, Hawaii, July 23-26, 1991: p. 604-610.
  41. Anderson, J. L., Dowdy, R. H., Lamb, J.A., Delin, G.N., Knighton, R., Clay, D., and Lowery, B., 1993, Northern cornbelt sand plains management system evaluation area: Agricultural Research to Protect Water Quality Conference Proceedings: Minneapolis, Minnesota, February 21-24, 1993, pp. 39-47.
  42. Bekins, B.A. Amos, R.T. Cozzarelli, I.M. Voytek, M.A. Kirshtein, J., Jones, E.J. Delin G.N., and Blowes, D.W., 2008, Evidence for anaerobic methane oxidation under iron-reducing conditions in a crude-oil contaminated aquifer, in EOS, Transactions, American Geophysical Union, Proceedings of American Geophysical Union fall meeting, San Francisco, CA, December 15-18, 2008.
  43. Bekins, B.A., Delin, G.N., 2004, Using dissolved and vapor phase gas analysis to investigate methanogenic degradation of petroleum hydrocarbons in variably saturated media, Geological Society of America Annual Meeting, Denver, Colorado, November 7–10, 2004.
  44. Bekins, B.A., Hostettler, F.D., Delin, G.N., Herkelrath, W.N., Warren, E., Campbell, P., Rosenbauer, R.J., Cozzarelli, I.M., 2010, Coupling of groundwater recharge and biodegradation of subsurface crude-oil contamination: American Geophysical Union Conference Proceedings, San Francisco, CA, December 13-17, 2010.
  45. Bekins, B.A., Hostettler, F., Cozzarelli, I., Herkelrath, W., Delin G.N., and Warren, Ean, 2004, Organic compounds in near-surface environments as drivers on the redox-reaction highway: a tribute to the career of Mary Jo Baedecker: Geological Society of America Abstracts with Programs Vol. 36, No. 5.
  46. Bekins, B.A., Hostettler, Frances, Cozzarelli, I, Herkelrath, W., Delin, G.N., and Warren, E.A., 2004, The influence of redox conditions, microbial populations, and hydrology on biodegradation of subsurface crude-oil contamination: Geological Society of America Abstracts with Programs Vol. 36, No. 5.
  47. Bekins, B.A., Warren, Ean, Delin, G.N., Hostettler, Frances, and Herkelrath, W.N., 2005, Controls on rates of oil and methane degradation at a crude oil spill site, Geological Society of America Annual Meeting, Salt Lake City, Utah, October 16-19, 2005.
  48. Böhlke, J.K., Wanty, R.B., Tuttle, M.L., Landon, M.K., Delin, G.N., 1994, Resolving the effects of varying land use and aquifer reactions on nitrate contamination of ground-water in central Minnesota: in EOS, Transactions, American Geophysical Union, Vol. 75, No. 16, p. 154, Proceedings of American Geophysical Union spring meeting, Baltimore, Maryland, May 23-27, 1994.
  49. Chaplin, B.P., Delin, G.N., and Lahvis, M.K., 2001, Long-term evolution of biodegradation and volatilization rates in a crude-oil-contaminated aquifer: Abstracts and Proceedings of the 24th Annual Midwest Environmental Chemistry Workshop, University of Minnesota, Minneapolis, October 6-7, 2001, 1 p.
  50. Dowdy, R.H., Lamb, J.A., Albus, W.L., Clay, D.E., Lowery, Birl, Delin, G.N., Anderson, J.L., 1995, Water quality under a ridge-tilled, corn/soybean farming system: Clean Water - Clean Environment - 21st Century Conference: Kansas City, Missouri, March 5-8, 1995, conference proceedings, Vol. 3, pp. 85-88.
  51. Erickson, M.L., Bekins, B.A., and Delin, G.N., Crude oil at the Bemidji site: 25 years of research, modeling and understanding: abstract of presentation at Minnesota Water Resources Conference, Minneapolis, MN, October 2010.
  52. Erickson, M.L., Bekins, B.A., and Delin, G.N., Crude oil at the Bemidji site: 27 years of research, modeling and understanding: abstract of presentation at International oil Spill Conference 2011, Portland, OR, May 23-26, 2011.
  53. Essaid, IE., Eganhouse, R.P., Cozzarelli, I.M., Herkelrath, W.N., Bekins, B.A., and Delin, G.N., 2001, Inverse modeling of BTEX dissolution and biodegradation at the Bemidji, MN crude-oil spill site: in EOS, Transactions, American Geophysical Union, Vol. 84, No. 47, p. F431, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 10-14, 2001.
  54. Guo, L., Alexander, E.C., Jr., Landon, M.K., Delin, G.N., and Regan, C.P., 1993, Geochemical characteristics and transport of agricultural leachates in a surficial aquifer: in EOS, Transactions, American Geophysical Union, Vol. 74, No. 43, p. 269, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 6-10, 1993.
  55. Hatfield, J.L., Anderson, J.L., Alberts, E.E., Prato, T., Watts, D.G., Ward, A., Delin, G.N., and Swank, R., 1993, Management systems evaluation areas -- an overview: Agricultural Research to Protect Water Quality Conference Proceedings: Minneapolis, Minnesota, February 21-24, 1993, pp. 1-15.
  56. Herkelrath, W.N., and Delin, G.N., 2001, Long-term monitoring of soil-moisture in a harsh climate using reflectometer and TDR probes: Proceedings of the Second International Symposium and Workshop on Time Domain Reflectometry for Geotechnical Applications, September 5-7, 2001, Northwestern University, Evanston, Ill., pp. 262-272.
  57. Herkelrath, W.N., and Delin, G.N., 2003, Unsaturated zone tracer test at the Bemidji, Minnesota crude oil spill site: in EOS, Transactions, American Geophysical Union, Vol. 84, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 8-12, 2003.
  58. Herkelrath, W.N., and Delin, G.N., 2005, Large-Scale Aquifer Test at the Bemidji, Minnesota, Oil-Spill Site: Implications for Modeling Multiphase Flow, Natural Attenuation, and LNAPL Remediation: in EOS, American Geophysical Union, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 5-9, 2005.
  59. Herkelrath, W.N., and Delin, G.N., 2009, Impacts of remediation at the Bemidji crude-oil spill site, USGS Toxics Substances Hydrology Meeting, San Diego, CA January 26-30, 2009.
  60. Herkelrath, W.N., Delin, G.N., and Cozzarelli, I.M., 2008, Push probe profiling of a subsurface BTEX plume using peristaltic bailing to obtain groundwater samples: Geological Society of America, October 5-9, 2008, Houston, Texas
  61. Lamb, J.A., Anderson, J. L., Dowdy, R. H., and Delin, G. N., 1992, Northern cornbelt sand plain MSEA: abstract for poster presented at the Minnesota Water '92 Conference: Minneapolis, Minnesota, February 13-14, 1992, 1 p.
  62. Landon, M.K., Delin, G. N., Guo, L., Regan, C.P., Lamb, J.A., Anderson, J.L., and Dowdy, R.H., 1993, Occurrence of agricultural chemicals in ground water at the management systems evaluation area (MSEA) near Princeton, Minnesota, 1991: Agricultural Research to Protect Water Quality Conference Proceedings: Minneapolis, Minnesota, February 21-24, 1993, pp. 434-438.
  63. Landon, M.K., Delin, G.N., Guo, L., Regan, C.P., Anderson, J.L., and Dowdy, R.H., 1992, Ground-water quality at the management systems evaluation area near Princeton, Minnesota, 1991: abstract for talk presented at the Midwest Ground Water Conference, Sioux Falls, South Dakota, October 14-16, 1992, 1 p.
  64. Landon, M.K., Delin, G.N., Komor, S.C., and Regan, C.P., 1994, Stable isotopes and major anions as tracers of recharge water to a sand and gravel aquifer, central Minnesota: in EOS, Transactions, American Geophysical Union, Vol. 75, No. 44, p. 277, Proceedings of American Geophysical Union fall meeting, San Francisco, California, December 5-9, 1994.
  65. Landon, M.K., Delin, G.N., Lamb, J.A., Dowdy, R. H., and Anderson, J.L., 1994, Impacts of farming systems on ground-water quality at the Princeton, Minnesota Management Systems Evaluation Area (MSEA), 1991-92: abstract for oral presented at the Minnesota Water '94 Conference: Minneapolis, Minnesota, April 21-22, 1994, 1 p.
  66. Landon, M.K., Delin, G.N., Lamb, J.A., Anderson, J.L., and Dowdy, R.H., 1996, Estimated masses of agricultural chemicals in ground water beneath different farming systems near Princeton, Minnesota: abstract for oral presented at the 32nd Annual AWRA Conference and Symposium on GIS and Water Resources, Ft. Lauderdale, Florida, September 22-26, 1996, 1 p.
  67. Landon, M.K., Delin, G.N., Lamb, J.A., Dowdy, R.H., and Anderson, J.L., 1994, Effects of farming systems on concentrations of nitrate in ground water at the Princeton, Minnesota Management Systems Evaluation Area (MSEA), 1991-92: in EOS, Transactions, American Geophysical Union, Vol. 75, No. 16, p. 157, Proceedings of American Geophysical Union spring meeting, Baltimore, Maryland, May 23-27, 1994.
  68. Lorenz, D.L., and Delin, G.N., 2005, Estimates of ground-water recharge in Minnesota, Geological Society of America Annual Meeting, Salt Lake City, Utah, October 16-19, 2005.
  69. Mayer, K.U., Amos, R.T., Bekins, B.A., and Delin, G.N., 2004, Using dissolved and vapor phase gas analysis to investigate methanogenic degradation of petroleum hydrocarbons in variably saturated media: Geological Society of America Abstracts with Programs Vol. 36, No. 5.
  70. Rostad, C.E., Hostettler, F.D., and Delin, G.N., 2002, Geochemical characterization of light non-aqueous phase liquid in the alluvial aquifer at Mandan, North Dakota: abstract in the Proceedings of the Midwest Ground Water Conference, Fargo, North Dakota, October 2-4, 2002.
  71. Slater, L.D., Atekwana, E.A., Revil, A., Skold, M., Ntarlagiannis, D., Gorby, Y., Mewafy, F., Day-Lewis, F.D., Werkema, D.D., Trost, J., Delin, G.N., Herkelrath, W.N., 2010, Investigation of biogeophysical signatures at a mature crude oil-spill contaminated site, Bemidji, Minnesota: American Geophysical Union Conference Proceedings, San Francisco, CA, December 13-17, 2010.
  72. Strobel, M.L., Munson, C.J., and Delin, G.N., 1999, A packer/vacuum system for measuring hydraulic conductivity in wells with light non-aqueous phase liquids, leaky casings, or water tables intersecting the screens: 9th Annual Ground-Water Quality Conference, program with abstracts, March 18-20, Pierre, South Dakota, p. 28.
  73. Trost, J., Lehman, C. Nieber, J., Tilman, D, Kiesling, R, Delin, G.N., and Erickson, M., 2009, Can perennial biofuel crops be used to remove pharmaceuticals (and nutrients) from the environment?, Minnesota Water Resources Fall Conference, St. Paul, Minnesota, October 27, 2009, 1 p.
  74. Wanty, R.B., Landon, M.K., Tuttle, M.L., and Delin, G.N., 1993, Impact of agriculture on the quality of shallow ground water: spatial and temporal changes in NO3 and Cl beneath a cornfield: abstract for talk presented at the Geological Society of America Conference, Boston, Massachusetts, October 25-29, 1993, 1 p.
  75. Woodward, D.G., and Delin, G.N., 1982 Potentiometric surfaces of regional aquifers in the Hollandale Embayment, southeastern Minnesota: American Geophysical Union Conference Proceedings, Minneapolis, Minn., 1 p.

 

OTHER REPORTS

 

Hoyer, M.C., Hallgren, J.P., Uebel., M.H., Delin, G.N., Eisenreich, S.J., and Sterling, R.L., 1994, University of Minnesota Aquifer Thermal-Energy Storage (ATES) project report on the third long-term cycle: University of Minnesota, for Battelle Pacific Northwest Laboratories, Richland, Washington, 125 p.