Env Impact Table 1

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

Table 1: Goal Attainment Scaling Assessment Criteria For Rehabilitation Operations Of Abandoned Wellsites In Sand Dune/Flood Plain Landsystems VERSION: 1995

Objectives
Minimise Visual Impact
Minimise Impact on Vegetation
Goals Well site effectively earthworked. Site Stabilised against Erosion. For well sites less than 5 years after abandonment site made conducive to revegetation. Good revegetation.
For well sites abandoned for at least 5 years.
-2 Wellsite not earthworked at all, original pad untouched. Severe erosion evident.
eg scalding covering more than 40% of well site and/or deep erosion gullies >30cm deep running down edge of well site.		 Pad & access tracks not ripped, soil quite consolidated. No revegetation evident.
Compared to surrounding landscape.
-1 Wellsite earthworked, however mound(s) of dirt from inadequate backfilling of mud pits on site remain which make the site distinguishable from surroundings. Moderate erosion evident.
Gullies up to 30cm deep running down edge of site and/or frequent scalding covering between 10% to 40% of lease area.		 Pad & access tracks deep ripped, however, moderate erosion evident down edge of site. Very little perennial or annual revegetation, site mostly bare when compared to surrounding landscape.
0 Original well site contours barely evident from road or from base of dune, only when on actual site, for example, pad edge distinguishable from surroundings Minor erosion evident.
Fairly even surface, small and sparse patches of scalding and/or small and sparse gully erosion along lease edges.		 Pad & access tracks deep ripped with some minor gully erosion evident down edge of lease. Even spread of annual, biannual and/or perennial revegetation over the site. Some bare patches evident over the site.
+1 Original well site contours not evident from distance, only after very close scrutiny. Only some rilling evident Pad & access tracks deep ripped with only some rilling evident. Dense vegetation coverage over the site, mostly annuals or biannuals. Very few bare patches.
+2 Wellsite contours indistinguishable from surrounding landscape, even from close range. No erosion evident. Pad & access tracks deep ripped and no erosion evident. Vegetation type and density indistinguishable from surrounding landscape.