https://maps.google.com/maps?q=chino+hills&hl=en&ll=33.901268,-117.653875&spn=0.013393,0.031371&sll=33.989819,-117.732585&sspn=0.001183,0.001961&t=h&hnear=Chino+Hills,+San+Bernardino,+California&z=16
The is near the 71 abd 91 freeway close to Pro Circuit at the top of a hill. Looks like and old track, rumor is Stewart used to ride up there anyone have an idea?? Entrance is off the 71 freeway south near some type of contstruction company, not sure if its state owned.