We have been using the 6’ foundation tube for use with the MGS due to the increased rail height affecting the loading of the anchorage during initial development of the system.
For the bullnose system, we would recommend similar length foundation tubes for anchoring a free end of the system. Note that the BCT posts adjacent to the nose of the system use 8’ long foundation tubes as only a single foundation tube is used for anchorage adjacent to the nose.
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