Table 5 Budget costs Summary of costs DesignLicensesConstructionMonitoring (5 years) Maintenance (5 years) Total Excavation and disposal £83,200£16,000£87,194,448£0 £87,293,648 Slurry wall£41,600£0£2,265,323£0 £2,306,923 Vent trench£41,600£0£1,276,265£0 £1,317,865 Vent wells£41,600£0£1,015,706£0 £1,057,306 Membrane in a trench £41,600£0£818,941£0 £860,541 Active abstraction £83,200£10,000£534,900£24,000£74,000£726,100 Active barrier£41,600£04758002400074000£615,400 Virtual curtain barrier £41,600£0£502,210£0 £543,810 Internal alarms£10,400£0£225,500£24,000£14,000£273,900 Item Weighting Health and safety implications.
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