| 907.75 Site Assessment and Site Field Observation |
| 918.42 Engineering Consulting |
| 925.17 Civil Engineering |
| 925.28 Drainage Engineering |
| 925.33 Engineer Services, Professional |
| 925.36 Engineering Services (Not Otherwise Classified) |
| 925.55 Inspecting, General/Engineering |
| 925.87 Sewage Collection, Treatment, and Disposal/Engineering |
| 925.95 Utilities (Gas, Steam, Electric)/Engineering |
| 925.96 Waste Water Treatment Engineering |
| 925.97 Water Supply, Treatment, and Distribution/Engineering |