| 1 | They discharged waste into a lake. | |
| 2 | The pipe leads waste water to a pool. | |
| 3 | The waste can be fatal if swallowed.Police are investigating what caused the reservoir to break. | |
| 4 | These include coal mining, quarrying, oil drilling, and the injection of wastewater into the ground. | |
| 5 | It is certainly preferable to dumping wastewater straight into the nearest big river or lake. |