About the Project: The Developer chose a special Charcoal coloured Concrete Sleeper for their Retaining Walls at Highgrove Estate with Galvanised Steel Posts. TJM have successfully managed the Retaining Wall programme throughout the individual stage development. Share this:Click to share on Twitter (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Facebook (Opens in new window)Click to email a link to a friend (Opens in new window)