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Pipe penetration through seepage barrier

Pipe penetration through seepage barrier

Pipe penetration through seepage barrier

Looking for recommendations/details of how to seal a pipe penetration through a 20 mil seepage barrier for a detention pond. The berm is about 5ft in height. The contractor is planning to key the 20 mil seepage barrier into the underlying clay soils. There are 2 pipe penetrations along the berm that need to be sealed to prevent seepage. It was originally going to be a clay seepage barrier, but the contractor went with the poly. Would clay or a bentonite-soil mixture work around the pipe penetrations?

RE: Pipe penetration through seepage barrier

Pipe penetrations are generally made with some type of boot. The gypsum method will probably not be successful unless the gypsum/soil depth is at least 4-6 Inches and the gypsum is fully incorporated into the soil. See the link:


RE: Pipe penetration through seepage barrier

While not part of the question, how are you protecting the membrane from sunlight, people walking in the slope and the protective cover sliding etc.?
Could be a lot of maintenance with the membrane, so the penetrations are only part of it.

RE: Pipe penetration through seepage barrier

What is the fluid? Can bentonite be used... it makes a wonderful seal. Doesn't work with some salts very well. Find the chemical and contact them.


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