Pond Boss Forums POND CONSTRUCTION Building a dam Seep collar(s) or sand filter filter diaphragm

The key in the above post is "guarantee the work". Personally unless you can make pottery from the clay I would not be comfortable in using the tracks on the excavator to properly compact the soil. The tracks are there to keep the machine from sinking into the soft ground, which is just the opposite of what you are looking for when compacting dirt.

As for the anti-seep collars, I would spec a minimum of one with the dirt compacted all around the pipe (bottom, sides and top), and preferably 2 anti-seep collars.