Mangere WWTP Sludge Tanks Replacement, NZ Bond Construction Management/ Watercare Services Ltd, Mangere WWTP Sludge Tanks Replacement, New Zealand Mangere Waste Water Treatment Plant (WWTP), Auckland, New Zealand – Parallel Estimate, tender evaluation and negotiation for Installation of:two Digester Feed Tankstwo Centrifuge Feed Tanksassociated pumps and pipe works