| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| DanielleS | "This is a great question! Yes, to a certain extent you can trace contaminants back to the source. You can do this with a combination of approaches ..." | Read more » | about 3 years ago | |||
| DanielleS | "Hi @CherokeeConcernedCitizens the high vs low is about the level of contamination you expect. so if you were on a site there was an oil spill say,..." | Read more » | almost 4 years ago |