Figure 4-1. Site selection guidelines for a Class III supply point.
Selection Criteria for Equipment. You must also select a site for other
equipment in the Class III supply point. This equipment includes 20,000-
gallon collapsible tanks, 50,000-gallon collapsible tanks, and 500-gallon
The site you choose for the 20,000-gallon collapsible tanks should be
similar to that for the 10,000-gallon collapsible tanks. Choose a site
that is nearly level with a gentle slope toward the manifold end of the
tank. Space the tanks about 150 feet apart. Build a fire wall around
each tank. Make it large enough to hold the contents of the tank and 1
foot of freeboard. To do this, build the fire wall 4 feet high and 18
35 feet long and 31 feet wide. Maintain a distance of 4 feet from the
edge of the tank to the base of the fire wall. If an engineer unit
prepares the site, you must ensure they follow these design factors.
Place the discharge pumps at a level lower than the tanks to aid pump
Choose a site for the 50,000-gallon collapsible tanks that is similar
to that for the 10,000- and 20,000-gallon collapsible tanks. Build the