[offcamber]

I can't answer your question either but...I think you were on the right track with the kandscape rake.
When my leach field was replaced I was ina similar situation....however the landscape rake really worked for me....anyone that lives here in NH will tell you that the rocks grow right out fo the ground....first cut of the season I raise the deck to about 3" that way I save my blades and can see the the new rocks.

Since buying the BX I been on the war path with the bigger rocks I couldn't dig out or move before.

Good Luck