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Table 1: Comparison of Smart Drain with other solutions

Solution Jet grouting wall Split grouting Geo-membrane Smart Drain belt
Item Quantity & cost Quantity & cost Quantity & cost Quantity & cost
Quantity Drill holes: 318 Drill length: 4286m Wall area: 7722m2 Drill holes: 572 Drill length: 7606m Excavation 7808m3 Backfill: 7278m3 Concrete: 530m3Geo-membrane: 11233m3
Total cost RMB2.2M (US$274,652) RMB2.045M (US$252,887) RMB1.87M (US$232,112) RMB100,000 (US$12,366)