I was at SEA the other day and I went to my usual spot of the UAL Cargo parking lot. However, for the first time ever, I was asked to leave by the Port of Seattle. They never used to care. Anyways, I couldn't go to any of my other airside spots because I had been warned, so I ended up driving to this baseball field on the approach. When it was about time to leave, I went looking fir this sewage plant that I always hear mentioned on this forum. I found it, but made no attempt to get into the parking lot as it was time for me to go. However, I did see several FAR warning signs on the fence. My question: do you need some kind of pass to get into this lot, and basically how do you get in? Thanks!