| 925.17 Civil Engineering |
| 925.33 Engineer Services, Professional |
| 925.35 Environmental Engineering |
| 925.51 Hazardous Waste Engineering Services (Incl. Remedial Investigations and Feasibility Studies for Waste Sites) |
| 926.23 Auditing Services, Environmental |
| 926.29 Contaminated Groundwater Services (Including Discharge Pipe Installation) |
| 926.30 Contaminated Soil Services |
| 926.42 Environmental Services (Not Otherwise Classified) |
| 926.54 Investigation Services, Pollution |
| 926.65 Oil and Petroleum Spill Services (Including Removal of Used Petroleum Products) |
| 926.70 Permitting Services, Environmental |
| 926.72 Planning and Advisory Services, Environmental |
| 926.78 Remediation Services, Environmental (Including Rehabilitation Services Hazardous Waste and Mold Remediation) |
| 926.83 Site Assessment, Environmental |
| 926.84 Soil Pollution Services |
| 926.85 Soil, Soil Vapor, and Groundwater Sampling and Analysis (Including Disposal) |
| 926.88 Storm Water Discharge Testing Services |