Sewer Cover The sewer tanks were not deep enough to avoid freezing, therefore a cover had to be placed above them. Originally it was a large wooden box filled with dirt which I had removed. I then built concrete walls around each sewer cap, and using 4 x 4 timber to build a planter box above the sewer tanks. Filling up the planting box with dirt then grass, next cutting flagstones to create covers for the tank caps.
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