What is the first step when performing an underwater evaluation of a water tank?

• A. Remove aquatic growth
• B. Remove Silt from the tank floor
• C. Remove waste material
• D. Remove 20% of the tanks water capacity

Answer: (B)

Clear visibility of the tank floor is essential for an accurate underwater evaluation, so the first step is removing silt from the floor. When the silt is cleared, the true condition of the bottom becomes visible, inspection tools can make proper contact, and you can reliably detect issues like corrosion, pits, or coating damage that would be hidden beneath sediment. After the floor is clean, you can address aquatic growth and waste materials as part of the follow-up cleaning and inspection steps. Draining or removing a portion of the water isn’t a typical first action during underwater evaluation, and removing only a fraction of the water could alter access and visibility.