We have an apartment complex 200 N to S by 55 E to W, with a 200 sewer line running down the middle of the complex N to S. The sewer line is completely rotted out and has to be replaced. We would rather tunnel if feasible than jackhammer apartments, but am looking for best solution. We need ideas about issues raised by tunneling under a structure. ie. confined space, shoring and respiration devices if needed. Help!
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