Drop tube extension distance from the bottom of the tank, per EPA guidelines, is within how many inches?

Drop tube extension distance from the bottom of the tank, per EPA guidelines, is within how many inches?

• A. 6 inches
• B. 18 inches
• C. 12 inches
• D. 24 inches

Answer: (C)

During EPA-guided tightness testing, the drop tube must reach into the lower part of the tank without sitting on the bottom. The guideline sets the maximum distance from the bottom at 12 inches, so the end of the tube should be within 12 inches of the bottom. This placement ensures the sample reflects the lower liquid portion, avoids bottom sludge or debris that could clog the tube, and keeps readings consistent across tanks. In short, the end of the drop tube should be no more than 12 inches above the bottom.

During EPA-guided tightness testing, the drop tube must reach into the lower part of the tank without sitting on the bottom. The guideline sets the maximum distance from the bottom at 12 inches, so the end of the tube should be within 12 inches of the bottom. This placement ensures the sample reflects the lower liquid portion, avoids bottom sludge or debris that could clog the tube, and keeps readings consistent across tanks. In short, the end of the drop tube should be no more than 12 inches above the bottom.