Environmental Compliance Representative
Environmental Compliance Representative


Evan Arntzen has more than 20 years of experience studying physicochemical properties of groundwater/surface water interaction zones for various federal clients. Throughout this time, he’s also successfully managed projects, led field teams, and implemented research projects. He’s an environmental compliance representative, a licensed geologist, and a valued team member of PNNL’s Subsurface Research Science Focus Area, specializing in project integration and coordination of modeling efforts with field-based validation.

Disciplines and Skills

  • Project management
  • Ecological monitoring
  • Grainsize distribution
  • Differential level surveys
  • Water velocity measurements
  • Passive sampling of aquifers and the hyporheic zone
  • Water quality monitoring
  • Collection of geospatial data using GPS
  • ArcGIS
  • Hydraulic testing
  • Calibrate/program sensors
  • Geochemical testing


  • MS in Geology, Portland State University, 2002
  • BS in Geology, Eastern Washington University, 1996

Affiliations and Professional Service

  • American Geophysical Union
  • Geological Society of America
  • American Fisheries Society
  • Sagebrush Elementary, Vice President, Board of Directors



  • Nelson WC, EB Graham, AR Crump, SJ Fansler, EV Arntzen, DW Kennedy, and JC Stegen. 2020. "Distinct temporal diversity profiles for nitrogen cycling genes in a hyporheic microbiome." PLoS One 15, no. 1:Article No. e0228165. PNNL-SA-125632. doi:10.1371/journal.pone.0228165
  • Villa JA, G Smith, L Renteria, JC Angle, EV Arntzen, SF Harding, H Ren, et al. 2020. "Methane and nitrous oxide porewater concentrations and surface fluxes of a regulated river." Science of the Total Environment 715. PNNL-SA-149661. doi:10.1016/j.scitotenv.2020.136920


  • Gao Z, H Liu, JE Missik, J Yao, M Huang, X Chen, EV Arntzen, et al. 2019. "Mechanistic links between underestimated CO2 fluxes and non-closure of the surface energy balance in a semi-arid sagebrush ecosystem." Environmental Research Letters 14, no. 4:Article Number 044016. PNNL-SA-142139. doi:10.1088/1748-9326/ab082d
  • Hou Z, TD Scheibe, CJ Murray, WA Perkins, EV Arntzen, H Ren, RD Mackley, et al. 2019. "Identification and mapping of riverbed sediment facies in the Columbia River through integration of field observations and numerical simulations." Hydrological Processes 33, no. 8:1245-1259. PNNL-SA-123667. doi:10.1002/hyp.13396
  • Missik JE, H Liu, Z Gao, M Huang, X Chen, EV Arntzen, DP McFarland, et al. 2019. "Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem." Journal of Geophysical Research. Biogeosciences 124, no. 1:99-114. PNNL-SA-142097. doi:10.1029/2018JG004666


  • Graham EB, AR Crump, DW Kennedy, EV Arntzen, SJ Fansler, SO Purvine, CD Nicora, et al. 2018. "Multi omics comparison reveals metabolome biochemistry, not microbiome composition or gene expression, corresponds to elevated biogeochemical function in the hyporheic zone." Science of the Total Environment 642. PNNL-SA-133671. doi:10.1016/j.scitotenv.2018.05.256
  • Zhou T, J Bao, M Huang, Z Hou, EV Arntzen, SF Harding, PS Titzler, CJ Murray, WA Perkins,  X Chen, JC Stegen, G Hammond, PD Thorne, JM Zachara. 2018. "Riverbed Hydrologic Exchange Dynamics in a Large Regulated River Reach." Water Resources Research 54, no. 4:2715-2730. PNNL-SA-123666. doi:10.1002/2017WR020508.
  • Stegen JC, TC Johnson, JK Fredrickson, MJ Wilkins, AE Konopka, WC Nelson, EV Arntzen, et al. 2018. "Influences of organic carbon speciation on hyporheic corridor biogeochemistry and microbial ecology." Nature Communications 9. doi:10.1038/s41467-018-02922-9.


  • Graham E, M Tfaily, A Crump, A Goldman, E Arntzen, E Romero, CT Resch, D Kennedy, J Stegen. 2017.  "Carbon inputs from riparian vegetation limit oxidation of physically bound organic carbon via biochemical and thermodynamic processes." Journal of Geophysical Research. Biogeosciences 122, no. 12:3188-3205. doi:10.1002/2017JG003967.
  • Zhou T, M Huang, J Bao, Z Hou, EV Arntzen, RD Mackley, AR Crump, AE Goldman, X Song, Y Xu, CJ Murray, JC Stegen, JM Zachara. 2017. "A new approach to quantify shallow water hyporheic exchanges in a large regulated river reach.” Water 9(9):703. 10.3390/w9090703.
  • Stern N, M Ginder-Vogel, JC Stegen, E Arntzen, DW Kennedy, BR Larget, EE Roden. 2017. Colonization habitat controls biomass, composition, and metabolic activity of attached microbial communities in the Columbia River hyporheic corridor. Appl. Environ. Microbiol. 83:e00260-17. https://doi.org/10.1128/AEM.00260-17.
  • Gao Z, E Russell, JE Missik, M Huang, X Chen, CE Strickland, RE Clayton, EV Arntzen, Y Ma, H Liu. 2017. “A novel approach to evaluate soil heat flux calculation:  An analytical review of nine methods.” Journal of Geophysical Research. D. (Atmospheres). 10.1002/2017JD027160.
  • Miller B L, EV Arntzen, AE Goldman, MC Richmond. 2017. "Methane ebullition in temperate hydropower reservoirs and implications for US policy on greenhouse gas emissions." Environmental Management.  10.1007/s00267-017-0909-1.
  • Arntzen EV and RP Mueller. (2017) “Video-Based Electroshocking Platform to Identify Lamprey Ammocoete Habitats: Field Validation and New Discoveries in the Columbia River Basin.” North American Journal of Fisheries Management, 37:3, 676-681, DOI: 10.1080/02755947.2017.1310152.


  • Graham EB , AR Crump, CT Resch, SJ Fansler, EV Arntzen, DW Kennedy, JK Fredrickson, JC Stegen. 2016. "Deterministic influences exceed dispersal effects on hydrologically-connected microbiomes." Environmental Microbiology.  10.1111/1462-2920.13720.
  • Graham EB, AR Crump, CT Resch, SJ Fansler, EV Arntzen, DW Kennedy, JK Fredrickson, JC Stegen. 2016. "Coupling spatiotemporal community assembly processes to ecosystem function." Frontiers in Microbiology 7: Article No. 1949. 10.3389/fmicb.2016.01949.
  • Hou Z, WC Nelson, JC Stegen, CJ Murray, EV Arntzen, AR Crump, DW Kennedy, TD Scheibe, JM Zachara.2016. "Geochemical and Microbial Community Attributes in Relation to Hyporheic Zone Geological Facies." Nature Scientific Reports. 10.1038/s41598-017-12275-w.
  • Stegen JC, J Fredrickson, MJ Wilkins, A Konopka, WC Nelson, E Arntzen, WB Chrisler, RK Chu, R Danczak, S Fansler, D Kennedy, CT Resch, and M Tfaily. 2016 “Groundwater-surface water mixing shifts ecological assembly processes and stimulates organic carbon turnover.” Nature Communications, 7, 11237; DOI: 10.1038/ncomms11237.
  • Fritz BG, RD Mackley, and EV Arntzen. 2016 “Conducting slug tests in mini-piezometers.” Groundwater, 54, 291–295; DOI: 10.1111/gwat.12335.


  • Williams KH, A Kemna, MJ Wilkins, J Druhan, E Arntzen, AL N’Guessan, PE Long, SS Hubbard, and JF Banfield. 2009. “Geophysical monitoring of coupled microbial and geochemical processes during stimulated subsurface bioremediation.” Environmental Science & Technology, 43, 6717–6723; DOI: 10.1021/es900855j.
  • Baldwin BR, AD Peacock, M Gan, CT Resch, EV Arntzen, AN Smithgall, S Pfiffner, DC White, and PE Long. 2009. “In-well sediment incubators to evaluate microbial community stability and dynamics following bioimmobilization of uranium.” Remediation Journal, 19, 73–89; DOI: 10.1002/rem.20218.
  • Arntzen EV, DR Geist, KJ Murray, ED Dawley, J Vavrinec, and DE Schwartz. 2009. “Influence of the hyporheic zone on supersaturated gas exposure to incubating chum salmon.” North American Journal of Fisheries Management, 29, 1714–1727; DOI: 10.1577/M08-212.1.


  • Geist DR, EV Arntzen, CJ Murray, KE McGrath, YJ Bott, and TP Hanrahan. 2008. “Influence of river level on temperature and hydraulic gradients in chum and fall Chinook salmon spawning areas downstream of Bonneville Dam, Columbia River.” North American Journal of Fisheries Management, 27, 30–41; DOI: 10.1577/M06-100.1.


  • Fritz BG and EV Arntzen. (2007) “Effect of rapidly changing river stage on uranium flux through the hyporheic zone.” Ground Water, 45, 753–760;DOI: 10.1111/j.1745-6584.2007.00365.x.


  • Arntzen EV, DR Geist, and PE Dresel. (2006) “Effects of fluctuating river flow on groundwater/surface water mixing in the hyporheic zone of a regulated, large cobble bed river.” River Research and Applications, 22, 937–946; DOI: 10.1002/rra.947.


  • Hanrahan TP, DR Geist, EV Arntzen, and GA McMichael. (2005) “Habitat quality of historic Snake River fall Chinook salmon spawning locations and implications for incubation survival: Part 1, Substrate quality.” River Research and Applications, 21, 455–467; DOI: 10.1002/rra.823.


  • Moser DP, JK Fredrickson, DR Geist, EV Arntzen, AD Peacock, SW Li, T Spadoni T, and JP McKinley. (2003) “Biogeochemical processes and microbial characteristics across groundwater – Surface water boundaries of the Hanford Reach of the Columbia River.” Environmental Science and Technology, 37, 5127–5134; DOI: 10.1021/es034457v.


  • Geist DR, TP Hanrahan, EV Arntzen, GA McMichael, CJ Murray, and Y Chien. (2002) “Physiocochemical characteristics of the hyporheic zone affect redd site selection of chum and fall Chinook salmon, Columbia River.” North American Journal of Fisheries Management, 22, 1077– 1085; DOI: 10.1577/1548-8675(2002)0222.0.CO