Questione giuridica chiave
Whether the reduced first-stage gravel extraction project required a new environmental impact assessment or rendered the existing report insufficient.
Decisione estratta
The reduced project did not require a fresh environmental assessment; the existing assessment remained sufficient for the unwooded part, and no concrete federal environmental-law defect was shown.
Motivazione estratta
The change concerned only the extraction sequence and removal of the wooded area, while the environmental effects of the stages were not shown to differ materially. The competent federal and cantonal specialist authorities had already approved the overall project, and the appellant identified no specific environmental deficiency.