The picture shows what happens during the winter months with the freezing and thawing of the ground. The orange tops you see are the bunker liner staples that have heaved up out of the ground this past winter. Even though the staples are serrated, they still get pushed out of the ground. Individuals will now have to go around to each bunker with a rubber mallet and hammer them back in. This is the main reason that the life expectancy of a liner is only 10 years at most.
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