This multi criteria evaluation (MCE) considers anthropological, ecological and environmental factors. The results of the MCE determines the areas which are most affected by all criteria in the buffer zones, which surround Highway 1. From this, the most affected areas can be visually represented and these areas can be considered most at risk and should be taken into careful consideration when designing remediation plans.
The first research finding came from the completion of the first MCE which was completed on the 1km buffer zone. This gave us a raster which we were able to use to determine which areas within a 1km distance of the highway were at higher risk. Results from the 1st buffer layer can be seen in Figure 12 below. This MCE determined that areas north of the Port Mann Bridge, just north of the Fraser River were most at risk. This can be attributed to the large amount of fish habitat and rivers. Deer Lake is also north of the Fraser River, which contains large amounts of salmon population which further supports the conclusions of the MCE. s
Figure 12: The first buffer zone which shows areas at higher risk are located to the south-east of the project area.
The second finding resulted from the completion of the MCE on the 3km buffer zone without the original 1km buffer zone to view the moderately affected buffer zone. These results were surprisingly different from the first buffer zone. Since the first buffer zone had more high risk areas north of the Fraser River, it was expected that the second buffer zone would follow a similar trend. However, upon completion of the second buffer zone MCE, it was seen that while there were high risk areas north of the Port Mann Bridge, this area extended south of the bridge. This is most likely a result of the increased fish habitats in the south western areas, as well as a decrease in effect by being further from the highway itself. The high risk areas in this buffer zone are more prominent south of the Port Mann bridge since part of the second buffer follows the Fraser River inland. Densely populated urban areas (downtown Vancouver) can be seen as bright green, or lowest risk areas as they have the least amount of at risk land type and salmon habitat. Results from the 2nd buffer layer can be seen below in Figure 13.
Figure 13: The second buffer zone which shows areas at higher risk are located to the north-west of the project area.
The buffer layer evaluations were then combined in order the to view the overall affect in both of the buffer zones. As seen below in Figure 14. They have similar areas of high risk and low risk, with the northern section of both buffer zones (downtown Vancouver and the Iron Workers Memorial Bridge) as being the lowest risk for both buffers. This low buffer zone can be attributed to the fact that the this area is mostly urban area and lower weights were given to urban areas. Both buffer zones have the highest risk areas surrounding the Port Mann Bridge and the Fraser River, while the second buffer zone extends more southerly than the first buffer zone. As aforementioned, this may be attributed to Deer Lake Park being in Burnaby and within the first buffer zone.
Figure 14: The risk of both buffer areas combined in one map showing the areas which are at higher risk of impact.
Therefore, from this MCE it can be determined that the at risk areas are the Port Mann Bridge and South of the Port Mann Bridge within the 3km buffer zone and the most at risk areas within the 1km buffer zone are North of the Port Mann Bridge and Deer Lake Park.