of non limiting example be a sheet piling wall wherein the barrier members comprise impermeable sheets barrier members 12 such as barrier piling sheets for use in forming barrier walls in soil formation 8 are known in the art methods of inserting such barrier member are also known in the art such as by way of non limiting example by utilizing known pile driver methods such as drop hammers vibratory hammers or plate tampers and excavators utilizing a mandrel or digging a trench to receive the barrier members 12 as illustrated in fig1 the barrier wall 10 may be formed by inserting a first barrier member 12 a into the soil formation and thereafter inserting a second barrier member 12 b adjacent to and slidably interlocked with the first barrier member 12 a with reference to the first barrier member 12 a in one form each barrier member comprises a body having a substantially rectangular outline defined by top 14 bottom 16 and first and second side edges 18 and 20 respectively as illustrated in fig2 the barrier member 12 may comprise a sheet of material having a variety of cross section profiles as are commonly known in the art for example by way of non limited example the barrier member 12 may have a substantially planar z shaped a double z shape u shaped or c shaped cross section profile as illustrated in fig1 the top and bottom edges 14 and 16 are substantially parallel to each other furthermore the first and second side edges 18 and 20 are substantially parallel to each other and substantially perpendicular to the top and bottom edges the first edge 18 has a first connector 22 disposed therealong while the.