Extended power outage would be my thought..showrguy, curious why you suggest to go lower than frost? Mine is 6' deep and comes up at the owb, if I was to shut the owb down I would have to drain the tank and lines anyway or it would just freeze in the back of the owb. The end of the line is just laying on the ground and sometimes is even laying in water which then freezes.
I have a back up generator in case of an extended power outage. If I didn't have enough fuel then I would likely use my compressor and blow all the lines but the house lines inside the house would freeze then anyway. At that point I would likely just light the house on fire and collect the insurance.
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