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If I remember correctly, during our meetings with MwRSF staff, there was some discussion about beam guard failing because the gap between the soil tubes and the soil surrounding it was 10 inches. 

WisDOT is putting the final touches on its existing barrier guidance and would like to place some statement in our design guidance to instruct our designers to review soil tubes and the soil around the tubes.  What gap distance between the soil tube and the soil around the soil tube should corrective action be taken (e.g.  10" of gap).