ʻO ka wili pōhaku ʻekolu lima piha i hana ʻia e kā mākou hui he mau pono o ka hōʻemi ʻana i ka nui o ka hana a nā limahana, ka hoʻomaikaʻi ʻana i ke kaiapuni hana, ka hoʻomaikaʻi ʻana i ka pono o ke kūkulu ʻana, a me ka hōʻemi ʻana i ka hilinaʻi ʻana o nā mea hoʻohana i ke akamai. He holomua nui ia ma ke kahua o ke kūkulu ʻana i ka mīkini tunnel. He kūpono ia no ka ʻeli ʻana a me ke kūkulu ʻana i nā tunnels a me nā tunnels ma nā alaloa, nā alahao, ka mālama wai a me nā kahua kūkulu hydropower. Hiki iā ia ke hoʻopau pono i ke kau ʻana, ka ʻeli ʻana, ka manaʻo hoʻihoʻi, a me nā hana hoʻoponopono o nā lua pahū, nā lua bolt, a me nā lua grouting. Hiki ke hoʻohana ʻia no ka hoʻouka ʻana a me ke kau ʻana i nā hana kiʻekiʻe e like me ke bolting, grouting, a me ke kau ʻana i nā ducts ea.
