Twin tunnels at Arimakita (1,810 m/1,845 m x 11 m wide) to be built in Cretaceous hard strata and Miocene soft strata by jv of Hazama/Maeda and Nishimatsu/Shimuzu at cost of Y10.6 billion commencing March, 1999 and scheduled for commissioning 2003. February 1999.
Twin tunnels at Kitasumakouku (380 m/550 m x 11 m wide) to be constructed in tuffs, conglomerates, sandstones and mudstones by jv of Konoike/JDC and Tobishima/Tokyu costing Y10.2 billion commencing June/December, 1999 for commissioning 2003. February 1999.
