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Photo 1 shows
the trencher is making its first cut from ground surface, down into the
trench alignment. The trenching boom is 27 feet long. In the photo, it is
cutting down through the dry bentonite powder to be hydrated by the
underlying groundwater.
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Photo
2 shows the trencher moving away from the camera position, cutting the
barrier wall 24 feet deep, through the upper aquifer and two feet into the
confining clay layer below. The trenching boom is obscured by the sand and
slurry mix being thrown up in the center of the photo. The
engineer on the right hand side is taking HNu readings to confirm safe
breathing conditions. The red hose in the foreground is feeding clean water
which assists the soil cutting and hydrating the bentonite in the trench. |
