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MINNESOTA Frost-fighting BMPs Minnesota Pollution Control Agency staffer Barb McCarthy reports that St. Louis County installers have adopted best management practices to help keep water from freezing in the 2-inch pressure pipe just after it leaves the pump tank. This portion of piping can sag as the ground settles, allowing ice to accumulate in the dip when the pump shuts off and effluent drains back to the tank. Enough ice will plug the system. To avoid the situation, installers tamp down the backfill, especially beneath the pipe outlet. Then they install a length of Schedule 40
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2012 08 24 09 56 55 788
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