| Company Name | Address | City | State | Zip Code | Phone Number | Fax Number |
| AECOM TECHNICAL SERVICES INC. | 303 E WACKER DR, STE 1400 | CHICAGO | IL | 60601-5207 | (312) 373-7700 | (312) 373-6800 |
| APPLIED TECHNOLOGIES INC | 468 PARK AVE | LAKE VILLA | IL | 60046 | (847) 265-7325 | (847) 265-7327 |
| ARCADIS | 200 S MICHIGAN AVE, STE 2000 | CHICAGO | IL | 60604 | (312) 917-1000 | (312) 917-1572 |
| BAXTER & WOODMAN INC | 8678 RIDGEFIELD RD | CRYSTAL LAKE | IL | 60012 | (815) 459-1260 | (773) 444-0334 |
| BIDNET | 15 BRITISH AMERICAN BLVD | LATHAM | NY | 12110 | (518) 438-009... | (518) 689-7038 |
| BLACK & VEATCH CORP | 101 N WACKER DR, STE 1100 | CHICAGO | IL | 60606 | (312) 346-3775 | (312) 346-4781 |
| BROWN & CALDWELL ENGINEERING | 141 W JACKSON BLVD, STE #300A | CHICAGO | IL | 60604 | (708) 870-6168 | (312) 483-2101 |
| CARNOW CONIBEAR & ASSOC LTD | 600 W VAN BUREN, STE 500 | CHICAGO | IL | 60607 | (312) 762-2930 | (312) 782-5145 |
| CDM SMITH INC | 125 S WACKER DR, STE 700 | CHICAGO | IL | 60606 | (312) 346-5000 | (312) 346-5228 |
| CIVIL & ENVIRONMENTAL | 555 BUTTERFIELD RD, STE 300 | LOMBARD | IL | 60148 | (630) 963-6026 | (630) 963-6027 |
| CJD STORMWATER SOLUTIONS | 2612 15TH AVE S | MINNEAPOLIS | MN | 55407 | (918) 605-5954 | (503) 214-8340 |
| CONSOR ENGINEERS | 247 W FRESHWATER WAY STE 210 | MILWAUKEE | WI | 53204 | 414-313-4213 | |
| COTTER CONSULTING | 100 S WACKER DR, STE 920 | CHICAGO | IL | 60606-1222 | (312) 696-1200 | (312) 696-1222 |
| ENGINEERING SERVICES GROUP INC | 4260 WESTBROOK DR, STE 115 | AURORA | IL | 60504 | (630) 780-2800 | (630) 566-5168 |
| GREELEY & HANSEN LLC | 100 S WACKER DR, STE 1400 | CHICAGO | IL | 60606 | (800) 837-9779 | (312) 558-1986 |
| HORNER & SHIFRIN INC | 8755 W HIGGINS RD, STE 325 | CHICAGO | IL | 60631 | (312) 332-4334 | (844) 339-2910 |
| HR GREEN INC | 30 S WACKER DR, 22ND FL | CHICAGO | IL | 60606 | (815) 385-1778 | (815) 385-1781 |
| INDUSTRIAL CONTRACTORS AND | 5655 BROADWAY | MERRILLVILLE | IN | 46410 | (219) 286-4577 | (219) 962-1011 |
| JACOBS ENGINEERING GROUP INC | 525 WEST MONROE ST, STE 1600 | CHICAGO | IL | 60661 | (312) 251-3000 | |
| KALETECH LLC | 3831 MCCOY DR, #109 | AURORA | IL | 60504 | (630) 853-2533 | (630) 604-2344 |
| KIEWIT ENGINEERING GROUP, IMC | 8900 RENNER BOULEVARD | LENEXA | KS | 66219 | 502-759-3695 | 678-807-2684 |
| MEAD AND HUNT, INC | 5 RICE RD | MILLBURY | MA | 01527 | 585-216-7076 | 414-291-8841 |
| MICHAEL BAKER INTERNATIONAL INC | 200 W ADAMS ST, STE 1800 | CHICAGO | IL | 60606 | (312) 707-8770 | (312) 707-8804 |
| NORTH AMERICA PROCUREMENT COUNCIL | P O BOX 40445 | GRAND JUNCTION | CO | 81504 | (302) 450-1923 | (302) 450-1925 |
| PRIME VENDOR INC | 4622 CEDAR AVE, BLDG 5, STE 123 | WILMINGTON | NC | 28403-6916 | (800) 746-9554 | (910) 726-1973 |
| ROHADFOX CONSTRUCTION CONTROL | 171 17TH ST NW, STE 1625 | ATLANTA | GA | 30363 | (404) 880-9888 | (404) 880-9911 |
| SALDEMAR SOLUTIONS LLC | 200 S HALSTED | CHICAGO | IL | 60612 | (312) 493-1346 | (312) 612-5219 |
| SMARTPROCURE INC | 700 W HILLSBORO BLVD, STE 4-100 | DEERFIELD BEACH | FL | 33441 | (888) 998-8675 | (954) 399-7067 |
| SPECIALTY CONSULTING INC | 2942 W VAN BUREN ST | CHICAGO | IL | 60612 | (312) 319-7575 | (312) 319-7580 |
| STANTEC | 350 N ORLEANS ST, SUITE 1301 | CHICAGO | IL | 60654 | (312) 831-3000 | (312) 831-3999 |
| STEWART SPREADING INC | 3870 N IL RTE 71 | SHERIDAN | IL | 60551 | (815) 695-5667 | (815) 695-5770 |
| TAS POWERED ENERGY INC D/B/A | 941 ESTES CT | SCHAUMBURG | IL | 60193 | (312) 515-0800 | |
| TERRACON | 1145 N. MAIN ST | LOMBARD | IL | 60148 | 630-953-9929 | 630-953-9938 |
| TOWER ENGINEERING GROUP LLC | 5901 N CICERO AVE, STE G5 | CHICAGO | IL | 60646 | (773) 329-1871 | |
| VISTARA CONSTRUCTION SERVICES INC | 728 W JACKSON BLVD, STE 526 | CHICAGO | IL | 60661-5480 | (847) 274-9849 | (312) 986-8660 |