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                        | SECTION E : ELECTRICITY, GAS, STEAM AND AIRCONDITION SUPPLY |  | Division 37 : Sewerage |  | Group | Class | Sub-class | Description |  | 370 |   |   | Sewerage |  |   | 3700 |   | Sewerage |  |   |   | 37001 | The operation and maintenance of sewer systems |  |   |   | 37002 | Collecting and transporting of human or industrial waste water or rain water by means of sewerage networks, collectors, tanks and other means of transport (sewage vehicles etc.) |  |   |   | 37003 | Treatment of waste water or sewer by means of physical, chemical or biological processes |  
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