| ADENA UTILITIES ENGINEERING INC. | 808 S RIDGE AVE | (847)-670-8840 |
| BARNES & REINECKE INC. | 425 E ALGONQUIN RD # A | (847)-640-7201 |
| BERT JOHNSON ASSOCS | 724 W CATINO ST | (847)-593-0600 |
| BRIGHTON ENGINEERING | 85 W ALGONQUIN RD | (847)-640-0840 |
| BUILDING TECHNOLOGY CNSLTNT PC | 215 N ARLINGTON HEIGHTS RD | (847)-788-8880 |
| CADRAFT SERVICES CO. | 2400 E OAKTON ST STE 203 | (847)-640-8851 |
| DBL GROUP INC. | 2400 E OAKTON ST | (847)-640-8851 |
| EAST WEST PRECISION INC. | 1415 E SUNSET TER | (847)-259-6450 |
| EIGEN INC. | 1502 S ARLINGTON HEIGHTS RD | (847)-670-9410 |
| EIGEN INC. | 1535 N DOUGLAS AVE | (847)-670-9410 |
| ELSTON ENGINEERING | 737 S MCKINLEY AVE | (847)-259-8060 |
| FREY WATER ENGINEERING INC. | 121 S CHESTNUT AVE STE 20 | (847)-670-7970 |
| GEORGE GRIVAS ASSOCS LTD | 59 W SEEGERS RD | (847)-364-9110 |
| GRL ENGINEERS INC. | 4256 N ARLINGTON HEIGHTS RD | (847)-670-7720 |
| GROVE DESIGNERS & CONSULTANTS | 2488 E OAKTON ST | (847)-981-8770 |
| HARTMANN CO. | 1645 CARBOY RD | (847)-298-3141 |
| HUNTINGTON ENVMTL SYSTEMS DE | 707 W ALGONQUIN RD | (847)-545-8800 |
| IMS INFRASTRUCTURE MNGMNT SRVC | 3350 W SALT CREEK LN STE 117 | (847)-506-1500 |
| KAMRY INC. | 2502 E SHERWOOD RD | (847)-670-7413 |
| MAGMA FOUNDRY TECHNOLOGIES INC. | 2340 S ARLINGTON HEIGHTS RD | (847)-427-1001 |
| NATIONAL ENGINEERING TECH | 121 S WILKE RD STE 300 | (847)-394-8287 |
| NJ TOBERMAN & ASSOC | 615 W ROCKWELL ST | (847)-259-1440 |
| NL CHEMICAL TECHNOLOGY INC. | 620 N ROLLING LN | (847)-398-7278 |
| SOIL & MATERIAL CO. | 8 W COLLEGE DR | (847)-870-0544 |
| SPIES & ASSOCS | 534 W CAMPUS DR | (847)-577-8808 |
| STERLING ENGINEERING | 5 E COLLEGE DR | (847)-253-7250 |
| SUN ENGINEERED SYSTEMS INC. | 415 E GOLF RD | (847)-439-9470 |
| TECHNOLOGY PROCESS SOLUTIONS INC. | 1618 N RAND RD | (847)-870-1170 |
| WENDES SYSTEMS INC. | 3105 N WILKE RD | (847)-818-8371 |
| WESTSIDE MECHANICAL | 3550 W SALT CREEK LN STE 112 | (847)-483-8080 |
| C M K ENGINEERING INC | 736 N MITCHELL AVE | (847)-670-0100 |
| EAGLE MOLD DESIGN INC | 116 S ARLINGTON HEIGHTS RD STE 301 | (847)-392-7150 |
| J MCINTYRE & ASSOCIATES INC | 115 S WILKE RD | (847)-259-5623 |
| MCBRIDE ENGINEERING | 320 S BELMONT AVE | (847)-394-4810 |
| MOERSFELDER & ASSOCIATES | 3365 N ARLINGTON HEIGHTS RD STE G | (847)-506-9453 |
| O'BRIEN & ASSOCIATES | 1235 E DAVIS ST STE 200 | (847)-398-1441 |
| TOBERMAN NORMAN J & ASSOCIATES | 2101 S ARLINGTON HEIGHTS RD | (847)-439-8225 |
