A
park use permit is required before you place your cache, and some
areas are off-limits (details on this are in work).
Permits can be obtained at the main office any weekday from 7:30 until 5:00 p.m. Here's the address:
Parks & Open Space Department
15151 East Alameda Parkway, Suite 4600
Aurora, CO 80012
You may call 303.739.7160 and talk to either of the front desk reservationists for availability of park sites.