What contaminants should be monitored during drilling operations?

Monitoring contaminants during drilling operations is crucial for ensuring environmental safety and compliance with regulatory standards. The correct choice includes heavy metals, hydrocarbons, and nitrates, as these substances pose significant risks to groundwater quality and ecosystem health.

Heavy metals can leach into groundwater and are toxic to aquatic life and humans, leading to long-term health effects. Hydrocarbons, often associated with fuels and oils, can contaminate water sources, creating both environmental and health issues. Nitrates, typically from fertilizers or contamination, can cause serious health problems when they enter drinking water supplies.

By focusing on these three categories of contaminants, drilling operators can develop effective monitoring strategies, mitigate risks, and take proactive measures to protect both the environment and public health during operations. This monitoring is part of good drilling practices that adhere to industry regulations and best practices.

In contrast, the other options involve contaminants that are generally less relevant to drilling operations or do not pose the same level of risk to water quality and public health during drilling activities.