Interesting stuff - thanks. So it was originally named Costello Prep when it was first created around 1970? I remember the first time I drove past there, almost 20 years ago. There was a teenage boy walking down the road not far from the entrance on Carranza and he flagged me down, asking for a lift because his car broke down. I didn't see any car and something didn't seem quite right. Then I looked in the rear view mirror and saw another kid running up the road towards my car. I said "sorry" and got out of there!
When I lived in Medford and went out that way I would frequently and see groups of the kids jogging or marching down Carranza Road and the surrounding dirt roads.