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SIGHT
- A pool of liquid on the ground near a pipeline.
- A rainbow sheen on water.
- Dead or discolored vegetation amid healthy plants.
- Water bubbling or being blown into the air.
- A low-lying, dense white cloud or fog originating near the pipeline location.
- Frozen ground near the pipeline.
- Fire or explosion near the pipeline.
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Sound
- An unusual hissing or roaring sound coming from the vicinity of the pipeline or connecting facility.
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Smell
- Any strange or unusual odor in the area of the pipeline.
- Some Enterprise Products pipelines transport natural gas, which is odorless in its natural state and have mercaptan added to odorize the product. Mercaptan is a chemical odorant that aides in leak detection and has a rotten egg smell.
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