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Ed
 
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wrote in message
oups.com...
Sometimes construction sites have buried tree stumps and similar
material that rots over time. Unless you live in an area known for
particular sink hole problems, I'd regrade it with topsoil in the fall
and then seed.


Thanks. I think this is the reason. I remember about 15-18 years ago I made
a garden in another location in the yard and there was a lot of branches
were buried under the soil.