This is what was submitted to iascanner.com.
SYSTEM - Motorola
SYSTEM ID - 4c1f
856.9375 857.9375 858.9375 859.9375 860.9375
FLEET MAP:
TALKGROUP ID'S
16 Administration
48 Maintenance (1B)
80 Security (1C) - Patrol
112 Electrical
144 Unknown
208 Gates
240 Gates - Admissions - Parking
272 Grandstand Security
368 Ice House
400 Security Alternate - Blue Shirts
432 Volunteers
496 Unknown
528 Unknown
656 Unknown (2A)
688 Livestock Control (2B)
1136 Electrical Shop
8336 Unknown
16592 Unknown
I assume all of the fire and medical stuff is done on their regular channels. (UHF). Check the des moines frequencies for those listings.