Obviously, given the nest full of baby spider eggs, mama orb had been there for at least a day or two. Which means she crawled in at Fort Mac, and stayed put for the entire 800km drive to Calgary. Now, maybe it's just me, but I think choosing to lay your eggs next to something as toxic as a gasoline tank is pretty much one of the stupidest things a spider could do. Those babies didn't stand much chance for survival where they were, so I didn't feel too guilty scraping the nest out with a piece of paper towel. Mama got safely relocated to a grove of flowers, though. Hopefully she'll lay new eggs in that much more welcoming environment.
Still, I gotta ask, why the gas tank? What goes through a spider's mind that makes her think that's a good place to nest? Seriously!
Also, I have no idea how I never knew about this before, but there's an awesomely long early season Stargate: SG-1/MacGyver crossover over at Chevron Two called "Thicker Than Water" by Margaret Martin. I'm only half-way through chapter four so I can't tell how it's gonna end, but so far it's very interesting, well-written, and excellently in-character. A good find. Yay for me! :D
EDIT: Apparently, today is the day for spiders. I just had a jumping spider hop onto my keyboard. Cute little guy, but so not the place for him to be. Off to the backyard he goes... ::le sigh::