When my .15 acre farm pond was renovated last summer there was about 4' a muck in the bottom that was excavated and most was buried under about a foot of topsoil. Some of it must have been buried very well though and now I have 2 areas that were always wet before the dirt work that has "oily" water is coming up and it smells similar to the barnyard. Don't mind the smell but all the grass and clover has died out in these areas. Other wet areas are doing just fine.

I assume this is the muck coming up through the soil. Are there any soil additives that I can apply to speed the decomposition of this muck?

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