| 83324 | Undertaking contamination studies for power projects | |
| 83325 | Undertaking contamination studies for telecommunications and broadcasting projects | |
| 83323 | Undertaking contamination studies for transportation projects | |
| 83326 | Undertaking contamination studies for waste management projects | |
| 83327 | Undertaking contamination studies for water, sewage and drainage projects | |
| 83321 | Undertaking contamination studies of agricultural buildings | |
| 83323 | Undertaking contamination studies of airfield runways | |
| 83323 | Undertaking contamination studies of bridges | |
| 83322 | Undertaking contamination studies of chemical and related facilities | |
| 83321 | Undertaking contamination studies of commercial buildings | |
| 83327 | Undertaking contamination studies of dams used primarily for drinking water or desalination purposes | |
| 83327 | Undertaking contamination studies of dams used primarily for flood control or irrigation purposes | |
| 83324 | Undertaking contamination studies of dams used primarily for power generation purposes | |
| 83323 | Undertaking contamination studies of dams used primarily for transportation purposes | |
| 83323 | Undertaking contamination studies of elevated highways | |
| 83323 | Undertaking contamination studies of harbours | |
| 83323 | Undertaking contamination studies of highways | |
| 83321 | Undertaking contamination studies of industrial buildings | |
| 83322 | Undertaking contamination studies of industrial plants and processes | |
| 83327 | Undertaking contamination studies of irrigation works | |
| 83323 | Undertaking contamination studies of local oil or gas pipelines and related works | |
| 83325 | Undertaking contamination studies of local telecommunication cables and related works | |
| 83327 | Undertaking contamination studies of local water pipelines and related works | |
| 83325 | Undertaking contamination studies of long-distance communication lines | |
| 83323 | Undertaking contamination studies of long-distance oil or gas pipelines | |
| 83324 | Undertaking contamination studies of long-distance power lines (cables) | |
| 83327 | Undertaking contamination studies of long-distance water pipelines | |
| 83322 | Undertaking contamination studies of manufacturing constructions | |
| 83322 | Undertaking contamination studies of mining constructions | |
| 83321 | Undertaking contamination studies of non-residential buildings | |
| 83329 | Undertaking contamination studies of other construction projects | |
| 83329 | Undertaking contamination studies of outdoor recreation facilities | |
| 83329 | Undertaking contamination studies of outdoor sport facilities | |
| 83324 | Undertaking contamination studies of power plants | |
| 83323 | Undertaking contamination studies of railways | |
| 83321 | Undertaking contamination studies of residential buildings | |
| 83323 | Undertaking contamination studies of roads | |
| 83323 | Undertaking contamination studies of streets | |
| 83323 | Undertaking contamination studies of subways | |
| 83322 | Undertaking contamination studies of the automation of industrial processes | |