Env Impact Table 2

Goal Attainment Scaling : Environmental Impact Evaluation in the Upstream Petroleum Industry

Table 2: Goal Attainment Scaling Assessment Criteria For Rehabilitation Operations Of Abandoned Wellsites In Sand Dune/Flood Plain Landsystems VERSION: 1997

Objectives
Minimise Visual Impact
Minimise Impact on Vegetation
Goals Effective earthworks on Interdunal and floodplain well sites Effective earthworks on Dune well sites For well sites less than 5 years after abandonment sites made conducive to revegetation. Good revegetation.
For well sites abandoned for at least 5 years.

-2

 No evidence of any restoration earthworks. Edges of the pad very prominent against the surrounding landscape contours. Extensive gully erosion down the face of the dune from the well site. Erosion gullies very prominent against the surrounding landscape. Consolidated surface in comparison with surrounding landscape on well site and access tracks. No revegetation evident.

-1

 Restoration earthworks carried out, however, the colour of the pad site is markedly different to that of the surroundings. Steep well site edges prominent against the natural contour of the dune face when viewed from the base of the sand dune (i.e. no evidence of any restoration work). Well site ripped but access tracks remain consolidated. Mostly annual/biannual vegetation and very little perennial vegetation as found on the surrounding landscape.

0

 Pad contoured into the surrounding landscape and original edges of the pad difficult to detect, however, earthworking disturbance on the pad surface makes the site very prominent against the surrounding landscape (e.g. ripping on dunefield and floodplain landsystem well sites). Well site contours not evident from the base of the dune, only visible when viewed from the top of the dune. Some erosion gullies down the face of the dune present but not extensive or visually prominent against the surrounding landscape. Surface of well site and access tracks ripped. Annual/biannual vegetation and extensive perennial vegetation (mainly shrubs and bushes) consistent with surroundings found on the site (see Santos vegetation handbook for identification of vegetation), however some bare patches inconsistent with the surrounding landscape are evident on the site.

+1

 Pad contoured into the surrounding landscape and original edges of the pad difficult to detect, site disturbance due to earthworks on the pad surface only marginally prominent against the surrounding landscape. Well site contours not evident from the base of the dune with no erosion gullies down the face of the dune Well site and access tracks have extensive annual/biannual vegetation coverage (see Santos vegetation handbook for identification of such vegetation). Mostly perennial vegetation on the site consistent with that on the surroundings, difference in maturity of vegetation on the site is evident(see Santos vegetation handbook for identification of vegetation).

+2

 No evidence of original pad contours or edges against the surrounding landscape nor any evidence of earthworking disturbance (i.e. original pad site cannot be seen). No erosion down the face of the dune and the contours of the well site indistinguishable from the surroundings when viewed from both the base and from top of the dune. Well site and access track have extensive annnual/biannual vegetation coverage with signs of perennial vegetation in keeping with the surroundings establishing itself on the site and tracks (see Santos vegetation handbook for identification of such vegetation). Vegetation type, density and maturity indistinguishable from that on surroundings.