| AbbVie, Inc. |
| Admiral Envmtl. Svcs., Inc. |
| AECOM |
| Alliant Energy |
| Allstate Insurance Company |
| Ameren Missouri |
| Amway Corp. |
| Anspach Law Office |
| Aon Risk Services Inc. |
| Aquinas College |
| Archer Daniels Midland Co. |
| Argonne National Laboratory,EVS/240 |
| Barnes & Thornburg LLP |
| BASF |
| BBJ Group |
| BP Products N.A. Inc. |
| Burns & McDonnell Engineering Co., Inc. |
| Calvin College |
| CF Industries |
| CITGO Petroleum Corp. |
| Civil & Environmental Consultants, Inc. |
| Clean Air Engineering |
| ComEd |
| Consumers Energy Company |
| Cornerstone Environmental Group LLC |
| DAI Environmental, Inc. |
| Dairyland Power Cooperative |
| Dynamic Manufacturing, Inc. |
| E. W. Inman, Ltd. |
| Envirologic Technologies |
| Environmental Information Logistis |
| Environmental Law & Policy Center |
| Environmental Partners, Inc. |
| Environmental Resources Mgmt (ERM) |
| Envmtl. Process Technologies., Inc. |
| EOSS Associates |
| ERM |
| Exelon LaSalle Generating Station |
| ExxonMobil Refining & Supply Company |
| EY |
| EZ-EV (An Exelon Company) |
| F L O W |
| Fehr Graham |
| Fermilab |
| Fishbeck, Thompson, Carr & Huber |
| Fleis & VandenBrink Engineering, Inc. |
| Foley & Lardner LLP |
| Foth Infrastructure & Environment |
| Freeborn & Peters LLP |
| Fuel Tech Inc |
| General Mills Operations, Inc. |
| Geosyntec Consultants |
| GHD Services, Inc. |
| Great Lakes Coca-Cola Bottling |
| Green Bay Packaging Inc. |
| Green Seed Energy |
| Greensfelder, Hemker & Gale, P.C. |
| GZA GeoEnvironmental Inc. |
| Hansen Professional Services |
| Hepler Broom LLC |
| Herman Miller Corp. |
| HOBI International |
| Holland Board of Public Works |
| Illinois Attorney General's Office |
| Illinois Environmental Protection Agency |
| Illinois Environmental Regulator Group |
| Illinois Institute of Technology |
| Illinois Tool Works, Inc. |
| Indiana Department of Environmental Management |
| Ingredion Incorporated |
| Innovative Environmental Solutions Inc. |
| Jacob & Hefner Assoc. |
| JF Consulting Inc. |
| Jones Day |
| K&L Gates LLP |
| Kent County DPW |
| Kent Law |
| Keramida, Inc. |
| Klafter & Burke |
| Kohler Company |
| Komatsu American Corp. |
| LADCO |
| Lake County Illinois Health Dept. |
| Land and Lakes Company |
| Madison Gas & Electric Co. |
| Maron Marvel Bradley Anderson & Tardy |
| MDEQ-RRD - Grand Rapids |
| Metropolitan Water Reclamation District of GC |
| Michael Best & Friedrich LLP |
| Michigan Dept. of Envmtl. Quality |
| Michigan Technological University |
| MicroBac |
| Milhouse Engineering & Construction, Inc. |
| Miller Canfield Paddock and Stone PLC |
| Molex, LLC |
| Montrose Air Quality Services LLC |
| Mostardi Platt |
| National Material Company |
| Natural Resource Group |
| Natural Resource Tech |
| Navistar, Inc. |
| Nicor Gas |
| Nipsco |
| Nixon Peabody LLP |
| NTH Consultants, Ltd. |
| O'Brien & Gere Engineeers, Inc. |
| O'Shea Environmental Assoc Inc. |
| P. Farber & Associates, LLC |
| Pacific Ethanol |
| Podlewski & Hanson |
| Praxair.com |
| Quarles & Brady, LLP |
| R.M. Young Company |
| Ramboll Environ |
| Rao Consulting Services, Inc. |
| Relief EHS |
| Republic Services, Inc. |
| RK & Associates, Inc. |
| Robert E. Sommerlad P.E. |
| Roux Associates Inc. |
| RPS GaiaTech |
| Schiff Hardin LLP |
| SCS Engineers |
| Seyfarth Shaw LLP |
| Short Elliott Hendrickson, Inc. |
| Silgan |
| SME |
| Spectrum Engineering, Inc. |
| Stepan Company |
| Stericycle |
| Teklab Inc. |
| Test America Inc. |
| Thompson Coburn LLP |
| Tradebe Environmental Services |
| TRC Companies |
| Trinity Consultants |
| U.S. DOE |
| Union Tank Car Company |
| United Airlines Inc. |
| Univ. of IL - Sustainable Tech. |
| University of IL at Urbana-Champaign |
| University of Illinois at Chicaco |
| University of Wisconsin-Stevens Point |
| US Ecology |
| US EPA Air & Radiation Div |
| V3 Companies |
| Varnum Riddering Schmidt & Howlett LLP |
| Vedder Price P.C. |
| WDNR |
| Weaver Consultants Group |
| Wingra Engineering, S.C. |
| Wood |
| ZFS Solutions, LLC |
