From The Riverside county Fire Protection Website
Tanks over 5,000 gallons require a separate permit and approval from the Building and Safety Division.
FIre Protection Requirements

Riverside County Tank Drawings

2.000 Gallon Tank Without Vortex Plate
Tank Form
2,000 Gallon Tank With Vortex Plate
Tank Form
2,200 Gallon Tank Without Vortex Plate
Tank Form
2,200 Gallon Tank With Vortex Plate
Tank Form
2,500 Gallon Tank Without Vortex Plate
Tank Form
2,500 Gallon Tank WIth Vortex Plate
Tank Form
3,000 Gallon Tanks Connected
3,000 Gallon Tank
3,500 Gallon Tank
4,000 Gallon Tank
5,000 Gallon Tank
5,000 Gallon Tank
Remote Mounted Hydrant)