178 Environmental Impact Analysis
description of the affected environment and minimize uncertainty. The nal
phase consisted of collection and processing sediment samples from a range
of areas along an enrichment gradient dened by the rst two phases of
the investigation for both chemical and biological characteristics (Figure 5.1).
Thus there were veriable laboratory data to conrm conclusions from the
rst two phases of the affected environment investigation. The laboratory
analysis was able to quantify the degree of enrichment as the organic carbon
content of sediments in the enriched area approached 4% as opposed to less
than 1% in other areas. The analysis also documented a different biologi-
cal assemblage in the area, indicati