| 918.42 Engineering Consulting |
| 918.94 Traffic Consulting |
| 925.17 Civil Engineering |
| 925.28 Drainage Engineering |
| 925.36 Engineering Services (Not Otherwise Classified) |
| 925.58 Irrigation; Drainage; Flood Control/Engineering |
| 925.93 Traffic and Transportation Engineering |
| 968.62 Pavement Data Collection Services |
| 968.85 Traffic Counting Services |
| 968.89 Traffic Studies and Analysis Services |