Landfill maps and land use change

I have attached satellite maps of the landfill area below - based on my own guess, so the boundaries may not be 100% correct (courtesy of Google Maps). It is difficult for me to exactly show where the monitoring stations are. You may click on the image for a larger version.

The four images below show changes in land use over time (click on the image for a larger version). The 1948, 1978 and 2005 images are taken from the Harmony Valley Park Master Plan, and the 2008 image is courtesy of Google Maps. The activity in the 1978 air photo is particularly interesting!