In the process of design a containment system for mulch and stone deliveries. I would like to keep the two seperate but right next to each other. Any ideas on what I should use to build a "U" shapped wall to hold the mulch? If I get deliveries over 50yds....how big will the "U" shaped wall need to be? I was thinking of building something out of 8'x8' posts sticking out of the ground with 12" wide slats all around? WIll the 8'x8' posts(in concrete) hold the deliveries of mulch and stone? I looked into the concrete barriers but I am not sure I like the looks and they are kinda of cost prohibitive!