First introduction to Natural Cement was a water authority contract for Yorkshire Water at Dunford Bridge near Holmfirth. The specification was for SHOTCRETE 513 due to its WAA status. The environmental considerations were paramount, and it’s inert nature and short curing times were fundatmental in its inclusion in the restrictive specification, which was for slope stabilisation on a primary drinking water reservoir. Since the successful completion of this contract, SHOTCRETE 513 has been our first choice for dry sprayed material within enviromentally sensitive areas such as rivers or water authority structures. An example of this was the limestone canal tunnels contract in Dudley, West Midlands, where SHOTCRETE 513 was sprayed onto the roof of unstable limestone tunnels for stabilisation.