Our goal was to get the two million gallon tank done in one day, which could have happened if we were willing to work all night on it. We discovered that 4-6 inches of sand had accumulated near the edge of one side of the tank. Our underwater vacuum (called a Hydradyne) can only effectively vacuum up an inch, sometimes two, of sand. So... most of the thick stuff had to be hand nozzled.
This was my first opportunity to dive and clean with the hydradyne. I dove the second half of the day and just wasn't able to make quick work of the job. That meant that we had to return the following morning to complete the tank, which was a bummer because it was Memorial Day weekend and we were hoping to finish the Mountain Home jobs so we could take a day or two off up in Boise. No dice... the tank took another five hours to clean, plus an hour to inspect, so we had to use Day 3 to clean the other tanks.
The last two tanks went pretty quick. They were both fairly clean and were small enough to finish cleaning and inspecting easily. We were in Boise by mid afternoon on Memorial Day and enjoyed a relaxed evening at the hotel.
The Mountain Home tanks:
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