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SUMMARY







                                                   (shale)
           Excavation        Pe8ormance



               Weatherin g
                                                              (Ωm)                                        (m/s)                         Pe8orman ce
                                               Resistivity                        Seismic     Vel ocity                Excavation
                   Grade


                       I                         1500    –  8000                         1500   –  3000                              Hard


                      II                         800    –  5000                          1000    –  3000                          Moderate



                      III                         500   –  3000                          1000    –  2 000                         Moderate


                      IV                             <  1000                                 <  1000                                 Easy


                      V                         5000    –  12 000                       Not   detected                               Hard












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