I was a graduate student in chemistry 10 years ago at a much smaller university and department in the Philly area and my TA stipend was ~$21K. It's absurd to me that that is what Temple offers. Also, just dug through my email for other places I had applied to at the time and those stipends were all in the mid-20s basically a decade ago. They don't really have an excuse especially if they actually want to maintain decent graduate programs.