8121 Reinforced earth walling (1) Site retaining walls constructed with battered earth strengthened by reinforcing, tie-back and anchor systems, may be combined with slope protection and erosion protection 8122 Geosynthetic reinforced soil (GRS) (0) Site retaining walls constructed with wrapped face Geosynthetic reinforced soil system 8125 Stone retaining walls (3) Site gravity retaining walls constructed with stone, dry stacked or with mortar 8126 Gabion retaining walls (0) Site gravity retaining walls constructed with Gabions, mesh cages wired together and filled with stone and other fill