When sampling a tank that remains in place, where should samples be collected?

The correct choice indicates that when sampling a tank that remains in place, samples should be collected 6 inches off each end and between 1 to 2 feet below the tank. This approach is vital for accurately assessing the condition of the contents and the tank itself. By sampling at these locations, you can capture potential stratification of the product within the tank, which may indicate how well the product is mixing or if there are layers of differing quality.

Sampling near the ends of the tank helps to ensure that any variations in the fuel that may settle differently are detected. Collecting samples at a depth of 1 to 2 feet below the tank is critical because it allows for a better understanding of the tank’s condition and contents, particularly if any contaminants or water have settled at the bottom.

Sampling at other proposed points, such as only at the top and bottom of the tank or only at the ends, would not provide a comprehensive evaluation. The top may not reflect issues present at the bottom, and limiting samples to the ends ignores any variations along the length of the tank. This methodical approach to sampling ensures that a thorough assessment is performed, leading to improved decision-making regarding tank management.