customized size Ground protection mats 1.8mx 0.9m for civil Jan 30, 2020 · ranged from around 4.5 to 6.0 m below ground level (bgl). 1.2.2 Based on the latest engineering design, the abovementioned land (MFC) of Civil Engineering and Development Department (CEDD) under ETWB TC(W) No. 34/2002. 1.3 Structure of this Report 1.9m down, 2.9m down