1500 is the "safe school zones" that create sentence enhancements for dealing drugs and other things.
The Gun Free School Zones are 1000, although there was a bill to extend that to 1500 feet, but as far as I know it didn't pass.
INCREASE GUN-FREE ZONES[/b] (Lieu)
Increases School Gun Free Zone from 1000' to 1500' for the criminal possession of a firearm.
This bill would extend the "gun free" zone distance from 1,000 feet to 1,500 feet from the grounds of a public or private school.[/b]
style="BACKGROUND: yellow"09/16/2009 - AB 668 failed to pass the legislature in 2009 but may return in 2010.