Patent ID: 8905679

Claim:
A method of constructing an impermeable barrier along a subterranean pathway comprising: a) drilling a series of holes tracing a desired path of the subterranean pathway, wherein one end of each hole is not accessible to the surface; b) threading a cable saw through pulleys on the distal ends of two pipes; c) inserting the pipes, at least partially, into adjacent first and second holes with the cable saw extending between the pulleys, such that the cable saw bears on the formation between the two adjacent holes; d) sawing a cut through the formation using the cable saw; e) conveying a grouting material into at least one of the adjacent holes and causing it to flow through the cut between the adjacent holes, wherein the grouting material and the formation cuttings are at least partially circulated back to the surface; and f) advancing the pipes through the adjacent holes while maintaining sawing action of the cable saw, wherein the cut is extended as the pipes are advanced.