Resume: Richard R. Gnat, P.G.

Office: (262) 781-0475

Areas of Professional Practice:

  • Site Characterization
  • Groundwater Investigations
  • Remedial Design
  • Remedial Construction
  • Geophysical Surveys
  • Spill Response
  • Risk Based Corrective Action
  • Regulatory Agency Negotiations
  • Environmental Audits/Strategies
  • Phase I/II Property Transaction Support
  • Apportionment Negotiations
  • Litigation Support
  • Risk Management
  • Closure Plans

Experience Summary:

Over 38 years of professional experience in the environmental site investigation and remediation. Impaired property transfer/transaction support includes over 100 Phase I/II ESAs for clients throughout the country, Central America and England. Acted as environmental due diligence support project manager for the acquisition of Union Texas Petroleum by Western Gas Resources which included the assessment of 108 properties across Texas, Nebraska and Louisiana. The project was completed on time and within budget. Currently also involved with a number of brownfield property transaction projects in southeastern Wisconsin including a large scale soil and groundwater remediation of a former industrial facility to facilitate property redevelopment for an athletic club and medical center. He has served on a Wisconsin Department of Natural Resources (WDNR) rule making committee associated with the development of brownfield grant eligibility requirements and scoring guidelines for evaluating grant submittals. He also served on an advising committee to WDNR providing technical input to the WDNR Remediation and Redevelopment program, guidance document development and rule revisions. Site investigation experience has included over 100 projects as the technical lead for the planning and implementation of CERCLA Remedial Investigations/Feasibility Studies (RI/FSs), RCRA Facility Investigations (RFIs), site investigations in support of industrial/brownfield property transactions, UST investigations and landfill studies. Investigation methods have included soil/bedrock drilling, monitoring well installation/sampling, use of field screening technologies and in-field analytical laboratories to guide real-time field decisions, well tests (single and multiple well) and geophysical surveys. Soil remediation experience has included developing and managing a variety of large-scale projects. This includes the stabilization of 14,000 cubic yards of cadmium impacted soils and the in-situ thermal stripping of 4,700 cubic yards of VOC impacted soils for an industrial client in western New York. Another example is the Walnut Street soil remediation in Milwaukee, Wisconsin which included the stabilization of chromium impacted soils, in-situ mechanical mixing with enhanced thermal stripping of soils for the gross reduction of VOCs followed by in-situ chemical oxidation as a polishing step. Groundwater remediation projects have included interceptor trenches, augmentation of in-situ biodegradation, pump and treat systems, in-situ chemical oxidation and the use of natural attenuation to meet cleanup objectives. Managed a natural attenuation evaluation in support of the shut-down of a large scale pump and treat system for an industrial client in Puerto Rico. The study convinced the regulators to allow the shutdown and eventual decommissioning of the system after only 3 years of operation out of the originally designed 15-year groundwater recovery program. The evaluation included the use of 3-dimensional groundwater modeling coupled with contaminant particle tracking simulations under a variety of risk-scenario conditions. Is technical lead for a large scale Dense Non-Aqueous Phase Liquid (DNAPL) evaluation and remediation project in northern Illinois. The site characterization included a bedrock well installation and development of a numeric groundwater flow model for the aquifer system. Defined a pool of free phase DNAPL 200 feet below the surface. Developed and interpreted pumping tests for the evaluation of both free phase and entrained DNAPL. Provided technical input into the design and construction of a pump-and-treat system focused on the extraction of DNAPL. He is working for electrical power generating stations in both Illinois and Wisconsin assisting with a variety of compliance issues including coal combustion residual (CCR) management.


  • M.S., Geosciences, University of Illinois at Chicago, 1984
  • B.S., Earth Sciences, Northeastern Illinois University, 1981
  • Additional Hydrogeology, Eastern Michigan University, 1985
  • Professional Geologist – Wisconsin (#G-149)
  • Professional Geologist – Illinois (#196-000900)
  • Professional Geologist – Minnesota (#30513; inactive)
  • Professional Geologist- Arkansas (#0259; inactive)

Employment History:

  • 2001 – Present / KPRG and Associates, Inc.
  • 1990 – 2000 / Hydro-Search, Inc./ Geotrans
  • 1989 – 1990 / Versar Inc.
  • 1984 – 1989 / Roy F. Weston, Inc.


  • Shestag, S., Gnat, R., et. al., 1994, Recovery, Evaluation and Decontamination of Landfilled Pentaborane Cylinders, Former Liquid Propellant Testing Facility, Washoe County, Nevada. Joint Army-Navy-NASA-Air Force Interagency Propulsion Committee
  • Gnat, R., Loch, M. et al., 1996. Machias Gravel Pit -Assessment through Remediation in Under Three Years. Hazardous and Industrial Wastes; Proceedings of the Twenty-Eighth Mid-Atlantic Industrial and Hazardous Waste Conference. Technomic Publishing Company, Inc., Lancaster, PA.
  • Rabideau, A., Swenson, K., Chen, B., Santiago-Collazo, F., Bronner,  C., Lowry, C., Gnat, R., Lockwood T., “Hydrologic Evaluation of a Poplar Phytoextraction System,” International Journal of Phytoremediation, May, 2021.