Changes to Meola, Three Kings, and Western Springs Aquifer

July 23rd, 2009

The large aquifer underlying Meola and Oakley Catchments has at least three names as above. The different names make clear the large extent of the clean water – a “buried treasure” of Auckland City.
As part of their Quarrying operation, Winstones are pumping out water from the top of the aquifer under Meola Creek – and into Manukau Harbour through the stormwater system. STEPS believes this has a direct impact on Meola Creek’s low base flow.

The report prepared for Winstone Aggregates by Tonkin and Taylor Ltd 8 July 2008 p1 “At its current depth (quarry base at RL34, with quarry rim at RL60-RL80 approx), resources are being extracted from below regional groundwater level. Groundwater within the quarry is depressed to below the quarry floor by pumping from a well within the quarry property.“

2009 photo - water is normally maintained at 34 RSL

2009 photo - water is normally maintained at 34 RSL

1998 photo - water is approx 2 metres above water table

1998 photo - water is approx 2 metres above water table (56 RSL)

These pictures give some idea of the amount of water which is removed in order to achieve this.
In May 2009 Winstones applied for a resource consent to fill the hole with “clean fill”.   The Three Kings United group (whose link is on this site) have monitored and researched this situation for many years. They are asking for truck  movements to be limited, and for the pit to be lined with impermeable surface to prevent leaching into the aquifer.

All technical documents are on Winstones’ own site http://www.winstoneaggregates.co.nz/DMS/Three_Kings_Quarry.php?id=40

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