Geophysical Investigation to Locate and Map Contamination and Footings Within an Old Gas Works, Central NSW (Q1 2016).

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GBG Australia undertook a non-destructive geophysical investigation to locate and map the location of contamination and footings within an old gas works in Central, NSW. For this investigation Ground Penetrating Radar (GPR), Frequency Domain EM (FDEM) and Earth Resistivity Tomography (ERT) were used.

The GPR data was collected using the GSSI SIR3000 GPR data collection system. Both a 400MHz and 200MHz shielded antennas were utilised for this investigation. The use of two different antenna frequencies enabled data to be collected to a depth beyond 2.5 meters.

The FDEM survey was conducted using the GSSI Profiler EMP-400 attached to a high accuracy DGSP. The ERT survey was conducted with using a 48 channel GF Instruments ARES Switch Resistivity System. All survey instruments used in this investigation were supplied by GBG Australia.

Figure 1: Site View.

Figure 2: Site View.

Figure 3: The FDEM survey being conducted attached to the High Accuracy DGPS unit.

Figure 4: The GPR survey being performed using the 200MHz Antenna.

Figure 5: The ERT Profile layed out across a roadway