My yard feels like walking on marshmallows even though it's well estab
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Rob27809916
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Suggested Project Book
http://homeguides.sfgate.com/making-yard-feel-spongy-92093.html
have you thatched the lawn?
https://www.youtube.com/watch?v=UZ6iYdPO3Kw
and could also be...https://pender.ces.ncsu.edu/2013/01/what-is-causing-mounds-and-tunnels-in-my-yard/
Water seeping? Maybe an underground spring or runoff from a nearby creek or river.