a seep can sometimes be slowed significantly with a properly executed polymer sealant at very low cost and very little hassle. Read threads on soilfloc
I did apply a bag of both A and B of the regular grind Soilfloc to the problem area - but did not notice any improvement. Later applied bag of the "coarse grind" A and B - most of it turned to pea size hard globs and floated for two weeks till I netted it all out. All of this was before the recommendation of using bentonite during the application.
