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| Task | Importance |
|---|---|
| Grade or level trench bases, using tamping machines or hand tools. | 88% |
| Dig trenches to desired or required depths, by hand or using trenching tools. | 86% |
| Cut pipes to required lengths. | 86% |
| Install or use instruments such as lasers, grade rods, or transit levels. | 84% |
| Cover pipes with earth or other materials. | 82% |
| Connect pipe pieces and seal joints, using welding equipment, cement, or glue. | 82% |
| Check slopes for conformance to requirements, using levels or lasers. | 81% |
| Install or repair sanitary or stormwater sewer structures or pipe systems. | 81% |
| Align and position pipes to prepare them for welding or sealing. | 81% |
| Lay out pipe routes, following written instructions or blueprints and coordinating layouts with supervisors. | 80% |
| Tap and drill holes into pipes to introduce auxiliary lines or devices. | 80% |
| Operate mechanized equipment, such as pickup trucks, rollers, tandem dump trucks, front-end loaders, or backhoes. | 78% |
| Train or supervise others in laying pipe. | 78% |
| Locate existing pipes needing repair or replacement, using magnetic or radio indicators. | 77% |