| Asquith Storage Project Solution Mining Water Aquifer Water Monitoring Prairie Evaporite Brine Disposal Project Documents | Water Aquifer The water for the cavern mining process in the Asquith project is sourced from the Tyner Valley Aquifer (TVA). In the area of the source water wells, the TVA is about 30 meters thick and about 70 meters below surface. The pumps in the source wells are set about 40 meters below surface and about 30 meters above the top of the TVA. Before pumping was initiated, the static water level in the source wells was about 3.5 meters below surface. Pumping from the source wells started on January 15, 2004 at a
combined rate of approximately 300 US gallons per minute (USGPM).
Over the next few months, this rate was gradually increased to a
pumping rate of 1200 USGPM. TransGas will vary the pumping rates
during the project, within the criteria set by Saskatchewan
Watershed Authority. To date, the maximum piezometer drawdown at the
source wells is about 20 meters, with most of the drawdown occurring
in the first few months of pumping. In the fall of 2007, all of the caverns are scheduled to be fully mined and pumping from the TVA source wells will be complete. 
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