BA SYD GLO -  AGL Avon Wards River alluvium extent v1

## **Abstract** 

This dataset was supplied to the Bioregional Assessment Programme by a third party and is presented here as originally supplied. Metadata was not provided and has been compiled by the Bioregional Assessment Programme based on the known details at the time of acquisition.



The data set was created by Becky Rollins (Hydrogeologist) at Parson Brinckerhoff and supplied under licence by AGL. It contains a shapefile of the Alluvium boundary as remapped by Parsons Brinckerhoff.  The data are required for the groundwater assessment of the Gloucester basin.

## **Dataset History** 

The data set was created by Becky Rollins (Hydrogeologist) at Parson Brinckerhoff and supplied under licence by AGL.  



The following data sources were used when developing an updated alluvium boundary for the Avon River and Wards River in the Gloucester Basin:

&#xF06E;	Geological mapping (Roberts et al, 1991)

&#xF06E;	Aerial photography

&#xF06E;	Slope analysis, based on the 1-sec SRTM DEM-S (Geoscience Australia, 2013)

&#xF06E;	Geological logs - exploration logs (AGL, 2013), monitoring bore logs (Parsons Brinckerhoff, 2012)

&#xF06E;	NSW Office of Water Registered Bores (NOW, 2013)

&#xF06E;	TEM Survey, Stratford Coal Project Hydrogeological Assessment (Heritage Computing, 2012)



The mapped alluvium extent (Roberts et al, 1991) associated with the Avon River is inaccurate in the vicinity of Dog Trap Creek and Avondale Creek. Geological logs from exploration bores and monitoring bores in the area show that alluvium is not present over some of the mapped area. The extent was updated based on these logs, and a TEM survey undertaken in the area (Heritage Computing, 2012). Slope analysis and aerial photography was used to update the Avon River and Wards River alluvium extent across the Gloucester Basin.

The typical thickness of alluvium encountered in the vicinity of the central AGL owned properties within the Stage 1 Gas Field Development Area (GFDA) is approximately 12m, and elsewhere it is not expected to exceed 15m.

Yours sincerely

 



Becky Rollins

Hydrogeologist

References

AGL (2013) Drilling completion reports, Exploration bores

Geoscience Australia (2013) available at http://www.ga.gov.au/metadata-gateway/metadata/record/gcat_72759, accessed November 2013

Heritage Computing (2012) A Hydrogeological Assessment in Support of the Stratford Coal Project: Environmental Impact Statement, Report HC2012/2, dated April 2012

NSW Office of Water (2013) Groundwater Database, available at http://waterinfo.nsw.gov.au/gw/, accessed May 2013

Parsons Brinckerhoff (2012) Phase 2 Groundwater Investigations - Stage 1 Gas Field Development Area, Gloucester Gas Project, Report PR_5630, dated January 2012

Roberts, J., Engel, B. & Chapman, J. (1991) Geology of the Camberwell, Dungog and Bulahdelah 1:100,000 Geological Sheets 9133 9233 9333, New South Wales Geological Survey, Sydney

## **Dataset Citation** 

Parsons Brinckerhoff (2014) BA SYD GLO -  AGL Avon Wards River alluvium extent v1. Bioregional Assessment Source Dataset. Viewed 18 July 2018, http://data.bioregionalassessments.gov.au/dataset/4484f125-8401-4324-a8a4-42fd1828e485.

Tags: Gloucester subregion, New South Wales, geoscientificInformation
Organization: Bioregional Assessment Program