Based on the research and type of analysis that has been done in this assignment, it is concluded that areas that are at high risk are the southern areas within the immediately impacted zone and the northern areas within the moderately impacted zones. The reasons for this most likely have to do with fish habitats and their proximity to streams and rivers. These were given higher weights than other factors and therefore the results can be expected. What this tells us however is that areas of high risk, when done using this type of analysis, can be very dependent on the parameters which the researchers set out from the beginning. Areas of high risk were determined to be highly dependent on fish habitats as well as which zone a feature was in; either the immediately impacted zone or the moderately impacted zone. While there were reasons for why these weights were chosen, as well as why buffer zones were set to the distances they were, it is highly likely that results would differ drastically under a different set of distances and weights.
Using the parameters and the data set out in this study, it would be suggested that mitigation efforts should be focused on the rivers immediately to the south of the highway 1 expansion project and on the rivers located near the northern side of project. These rivers are home to the majority of the fish species and habitats. While it was surprising that the Fraser River which runs through the middle area of the impact did not have much influence, it is understandable considering there are not as many fish habitats there and it is primarily used as a migration route which is a factor which did not make an appearance in this study.
Further study that could be done but which was not completed here could be examining a Digital Elevation Model to examine the drainage patterns leading away from the highway. This would allow the visual representation of run-off direction, accumulation and severity. This could be used to narrow down the areas that are most at risk of experiencing adverse effects. Particularly, streams and fish habitat areas.
In an area so highly urbanized, vegetation around fish habitats is likely an important factor and part of what led to the high areas of risk towards the southern areas of the impacted regions. Therefore, mitigation should likely focus on the preservation or creation of vegetated fish habitats (Feist et al., 2003).