How long can FOG samples be stored properly?

FOG, which stands for fats, oils, and grease, can be a significant concern for wastewater treatment facilities. Proper sampling and storage of FOG samples are crucial for accurate analysis and management.

The correct answer indicates that FOG samples can be stored for up to 28 days. This duration allows for sufficient time to transport the samples to the laboratory for analysis while ensuring that the chemical and physical characteristics of the samples remain relatively unchanged. It is essential to minimize degradation that can alter the sample’s properties, potentially leading to inaccurate test results.

Samples beyond this time frame may begin to change, affecting the integrity of the data collected during testing. By adhering to a 28-day storage period, operators can ensure compliance with regulatory standards and maintain the reliability of the data used for monitoring and decision-making regarding wastewater treatment processes.

In contrast, options suggesting shorter durations would not allow enough time for transport and analysis, while the choice of 30 days exceeds the recommended timeframe, which can compromise the sample quality.