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6.1. Groundwater — Sub-Artesian Bore

Groundwater resource potential was assessed through the drilling of a number of test bores and
the completion of the bores as groundwater monitoring facilities. Groundwater quality was
assessed through laboratory testing of water samples taken from the monitoring bores.
Following an initial review of topographic mapping and aerial photography, the elevated

“ Landsborough Sandstone outcrop covering a significant portion of the property was identified as

the most prospective groundwater target.
Groundwater

Coffey and Water Studies undertook a program of field investigations over the period 21“ to 25"
July 2003. Three (3) test bores (GW1, GW2 and G3) were drilled within the area of elevated
bedrock on the property by rotary wash boring techniques using a Jacro 200 drill rig. All three
test holes were completed as groundwater monitoring bores, and the approximate locations of
the bores are given on Figure 1.

An approximate assessment of groundwater yield was obtained by noting the ability of bores to
sustain pumping during purging for groundwater sampling. Groundwater samples were
collected and submitted to a NATA registered laboratory (Australian Laboratory Services (ALS),
Brisbane) to be analysed for a range of chemical parameters.

Construction of Groundwater Monitoring Bores

Groundwaier monitoring boreholes were drilled to intersect the shallowest aquifer on the site.
All groundwater monitoring bores were constructed with 50mm internal diameter, Class 18
machine slotted PVC pipe, with a sand filter pack installed around the screened section and a
bentonite seal between the screened section and the ground surface. The wells were
completed approximately one metre above the ground with PVC end caps.

Groundwater Sampling

Groundwater sampling was carried out on 23 July 2003. The groundwater sampling procedure
is summarised below.

© The groundwater level in the weil and depth of well was measured. : .

© The well was purged prior to sampling, using a 12V whale pump and dedicated Waterra
tubing. ‘

© Samples were collected in containers provided by a NATA accredited analytical testing
laboratory. The samples were stored on ice and forwarded to ALS in Brisbane for
analysis, under the standard Coffey Chain of Custody documentation. The samples for
metals analysis were field filtered using a 0.45-micron filter attached to 10mL syringes.

e All laboratory analytical methods employed were based on the NSW EPA and USEPA
standard methods.

Groundwater Results Pa 6 piece

The three groundwaier exploration bores GW1, GW2 and GW3 were drilled fo depths of 10.3m,
10.0m and 11.0m respectively, and terminated in fresh sandstone of the Landsborough
Sandstone Formation. All three groundwater exploration bores were terminated due to slow bit
penetration in the relatively hard, fresh sandstone. There were no obvious fractured zones
encountered in the drilling.

 

PETRAC LAND HOLDINGS P/L Noosa North Shore Eco-Tourism Portal September 2003
LA7296-03\Report\FINAL REPORT - 18Sept03.dac Commercial in Confidence Page 19