Gravel Road Design amp Maintenance Planning Josh Platt President Maine Environmental Solutions LLC In Partnership With Kennebec County Soil amp Water Conservation District 1 5 – ¾ minus material with 712 fines Bluestone gravel crushed bluestone or slate with crusher dust included Still 712 fines Gravel Road Design amp Maintenance Planning Josh Platt President Maine Environmental Solutions LLC In Partnership With Kennebec County Soil amp Water Conservation District 1 5 – ¾ minus material with 712 fines Bluestone gravel crushed bluestone or slate with crusher dust included Still 712 fines