Judgment index

Time to repair

Repairing method

No repairing

No repairing

Plan-1

Concentration

Point of time when the concentration at the sea area is more than it for the closure and abandonment of coastal landfill sites (C = 0.1)

Repairing the steel-made side impervious walls on sea-side only

Plan-2

Repairing the steel-made side impervious walls on the both sides (sea side and landfill site side)

Plan-3

Total flux

Point of time when the total flux is more than it for the closure and abandonment of coastal landfill sites

Repairing the steel-made side impervious walls on sea-side only

Plan-4

Repairing the steel-made side impervious walls on the both sides (sea side and landfill site side)

Plan-5

Hydraulic conductivity

Point of time when the hydraulic conductivity is more than it for the technical guidelines of impervious walls (1.0 × 10−6 cm/sec)

Repairing the steel-made side impervious walls on sea-side only

Plan-6

Repairing the steel-made side impervious walls on the both sides (sea side and landfill site side)