Abstract: The invention is a method of installing an outer-cased piling through a zone of subsoil contamination which includes boring a hole to a predetermined depth below the contamination, placing a smaller diameter casing in the full length of the hole, pumping a cementitious material between the outer casing wall and the soil, installing the piling through the casing and down to a point of refusal below the contaminated zone, filling the piling form with cement and then filling the void between the piling and casing with a cementitious material.The outer-cased piling design allows the piling installation through zones of contamination without adversely impacting the environment or spreading the contamination to other subsurface layers.

Abstract: The invention is a method of installing an outer-cased piling through a zone of subsoil contamination, and the apparatus used therein, which includes boring a hole to a predetermined depth below the contamination, placing a smaller diameter casing in the full length of the hole, pumping a cementitious material between the outer casing wall and the soil, installing the piling through the casing and down to a support layer well below the contaminated zone, filling the piling form with cement and then filling the void between the piling and casing with a cementitious material.The outer-cased piling design allows the piling installation through zones of contamination without adversely impacting the environment or spreading the contamination to other subsurface layers.