Sec. 26.10.03.06. Piping

A. UST system piping which is below the ground surface shall be placed on a 6-inch bedding of appropriate backfill material as described in this chapter.

B. The following clearances shall be maintained when piping is installed:

(1) At least 4 inches between all piping, and between piping and electrical conduit;

(2) At least 6 inches between piping and excavation side walls; and

(3) At least 18 inches between piping and the surface of the ground.

C. Piping shall rise 1/8 inch for each lateral foot from the tank to the piping end point.

D. Manufacturer specifications and installation requirements shall be followed when installing piping.

E. Piping carrying a regulated substance shall be connected to the tank and the dispensing equipment at the end of the piping run by an Underwriters Laboratory-listed flexible connector, installed in accordance with manufacturer specifications. Flexible connectors may not be used at any other point in the piping.

F. Pressurized product piping which dispenses motor fuels shall have an Underwriters Laboratory-listed shear valve placed and be properly anchored at the dispenser.

G. Electrical conduit and other apparatus such as water and air piping unrelated to the UST system may not be installed in the UST piping trenches.

H. Vent lines above the ground surface shall be:

(1) Constructed with at least schedule 40 steel;

(2) Protected from traffic;

(3) Properly anchored; and

(4) Protected from weather and debris.

I. Vents for UST systems storing flammable liquids shall terminate 12 feet above the ground surface and 2 feet above any attached building.

J. Vents for UST systems storing combustible liquids shall terminate at least 3 feet above the ground surface.