Desperation Pond West Cofferdam As-Built Construction Report, Ekati Diamond Mine (EBA Engineering, October 2002)

Desperation Pond West Cofferdam As-Built Construction Report for the Ekati Diamond Mine (BHP Billiton Diamonds Inc., Project No. 0101-94-11580.058), October 2002, prepared by EBA Engineering Consultants Ltd. Documents construction of the West Cofferdam with 184,450 m³ water storage at 1 m freeboard, key-trench excavation with Cat 345 excavator at Sta. 0+070, levelling-course compaction with Cat CS-563C vibratory compactor, fillet-zone placement with Cat D4H bulldozer (Sta. 0+040 to 0+060), and EBA Aggregate Analysis Report (200 mm sieve summary, March 5 2002 sample).