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The “reconstruction” of lagoon 164 may provide clues as to why many of the Phase 5 lagoons have bottoms that are too high.
1. Rebuilt slopes are sloughing—sliding into the bottom. When soil is used as a construction material, such as in dams or under roads and houses, it must be compacted in lifts.
2. The silt buildup at the silt fence indicates highly erodible soils. This buildup came from a relatively short slope during a short period of time. Without the silt fence, this silt would be in the bottom of the lagoon.
3. With steep, uncompacted slopes and uncompacted embankment (in lifts), it can be expected that the bottom of lagoon 164 will quickly fill with silt.
1. Rebuilt slopes are sloughing—sliding into the bottom. When soil is used as a construction material, such as in dams or under roads and houses, it must be compacted in lifts.
2. The silt buildup at the silt fence indicates highly erodible soils. This buildup came from a relatively short slope during a short period of time. Without the silt fence, this silt would be in the bottom of the lagoon.
3. With steep, uncompacted slopes and uncompacted embankment (in lifts), it can be expected that the bottom of lagoon 164 will quickly fill with silt.
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