| Company Name | Address | City | State | Zip Code | Phone Number | Fax Number |
| A2N ENGINEERING GROUP PLLC | 4801 SOUTHWICK DR | MATTESON | IL | 60443 | (708) 850-6387 | (708) 850-6350 |
| AEC ADVISORS | 233 WACKER DR | CHICAGO | IL | 60661 | (312) 206-5501 | (312) 206-5501 |
| ANGSTROM LLC | 4455 S KING DR, SUITE 101B | CHICAGO | IL | 60653 | (913) 972-6779 | (913) 972-6779 |
| AQUASIGHT | 1650 W BIG BEAVER, STE 101 | TROY | MI | 48084 | (630) 923-4876 | (999) 999-9999 |
| BIDNET | 20A RAILROAD AVE | ALBANY | NY | 12205 | (800) 677-1997 | (518) 438-0599 |
| BLACK & VEATCH CORPORATION | 180 N WACKER DR, STE 550 | CHICAGO | IL | 60606 | (312) 683-7850 | (312) 346-4781 |
| BUILDERS AVENUE | 1452 E 52ND ST | CHICAGO | IL | 60615 | (708) 232-3919 | (708) 232-3919 |
| CHICAGOLAND | PO BOX 3533 | PEORIA | IL | 61612 | (309) 401-6167 | (309) 401-6168 |
| CHICAGOLAND TRENCHLESS REHABILITATI | 7400 WAUKEGAN RD, 101 | NILES | IL | 60714 | (847) 588-1145 | (847) 588-1146 |
| CONSTRUCT CONNECT | 30 TECHNOLOGY PKWY S, STE 100 | NORCROSS | GA | 30092 | (800) 364-2059 | (866) 570-8187 |
| CROWE LLP | 225 W WACKER DR, STE 2600 | CHICAGO | IL | 60604 | (312) 880-4818 | (312) 899-5300 |
| DESIGN CONSULTING ENGINEERS | 3841 W DEVON AVE | CHICAGO | IL | 60659 | (773) 283-8500 | (773) 681-0599 |
| DUKES ROOT CONTROL INC | 400 AIRPORT RD, STE E | ELGIN | IL | 60123 | (800) 447-6687 | (999) 999-9999 |
| ENG SYSTEMS | 2344 W 33RD ST | CHICAGO | IL | 60604 | (555) 247-9698 | (555) 247-9698 |
| EPLAN ONLINE PLANROOM | 1400 FORUM BLVD, STE 7B | COLUMBIA | IL | 65203 | (573) 447-7130 | (573) 355-5405 |
| GEWALT HAMILTON ASSOCIATES INC | 625 FOREST EDGE DR | VERNON HILLS | IL | 60061 | (847) 478-9700 | (847) 478-9701 |
| GWO TRUCKING INC | 1035 W 111TH ST, UNIT 3 | CHICAGO | IL | 60643 | (708) 330-4425 | (708) 330-4423 |
| IMS | 945 HORNBLEND ST | SAN DIEGO | CA | 92109 | (858) 490-8800 | (858) 490-8811 |
| INFRASTRUCTURE ENGINEERING INC | ONE SOUTH WACKER DR, STE 2650 | CHICAGO | IL | 60606 | (312) 425-9560 | (312) 425-9564 |
| INLINER SOLUTIONS LLC | 5031 W 66TH ST | BEDFORD PARK | IL | 60638 | (708) 774-7799 | (708) 575-4215 |
| JACOBS ENGINEERING GROUP INC | 525 WEST MONROE ST, STE 1600 | CHICAGO | IL | 60661 | (312) 251-3000 | (999) 999-9999 |
| JADE SCIENTIFIC INC | 39103 WARREN RD | WESTLAND | MI | 48185 | (734) 405-6620 | (734) 405-6623 |
| LEYDEN ELECTRIC INC | 604 E NORTH ST | ELBURN | IL | 60119 | (630) 365-0200 | (630) 365-0202 |
| MATTHEWS PROPERTY SERVICE | 3049 W JACKSON BLVD | CHICAGO | IL | 60612 | (708) 553-5181 | (000) 000-0000 |
| MICRONICS ENGINEERED FILTRATION | 1201 RIVERFRONT PARKWAY | CHATTANOOGA | TN | 37402 | (423) 698-8988 | (423) 624-0274 |
| NATIONAL POWER RODDING CORPORATION | 2500 W ARTHINGTON ST | CHICAGO | IL | 60612-4108 | (312) 666-7700 | (312) 666-5810 |
| NPL CONSTRUCTION | 750 E DIEHL RD, SUITE 135 | NAPERVILLE | IL | 61107 | (815) 981-6575 | (000) 000-0000 |
| PICA CORPORATION | 4909 75 AVE NW | EDMONTON | AB | T6B 2H6 | (215) 920-0237 | (780) 482-9378 |
| PIPE VIEW LLC dba PIPE VIEW AMERICA | 13190 S FM 730 | AZLE | TX | 76020 | (312) 533-0744 | (815) 600-8247 |
| RJN GROUP INC | 2655 WARRENVILLE RD, SUITE 225 | DOWNERS GROVE | IL | 60515 | (630) 682-4700 | (630) 682-4754 |
| RME | 200 S MICHIGAN AVE, STE 1500 | CHICAGO | IL | 60604 | (312) 870-6607 | (312) 663-1473 |
| SE3 LLC | 1111 BURLINGTON AVE, SUITE 111 | LISLE | IL | 60532 | (630) 641-9900 | (999) 999-9999 |
| SHERIDAN PLUMBING & SEWER INC | 6754 W 74TH ST | BEDFORD PARK | IL | 60638 | (708) 475-7100 | (708) 475-7138 |
| 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 |
| TWO SIGMA CONSTRUCTION GROUP INC | 520 W ERIE ST, STE 101 | CHICAGO | IL | 60654 | (312) 748-6380 | (312) 748-2680 |
| VETERANS VAC SERVICES | 518 S ROUTE 31 | MCHENRY | IL | 60050 | (805) 307-9648 | (999) 999-9999 |