Note#90
You can protect piping which in contact with the ground or routinely contains fuel by one of the following methods
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made of a non-corrodible material (such as fiberglass or flexible plastic)
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made of steel and coated and cathodically protected
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made of steel and cathodically protected
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isolated from contacting the earth by being inside some form of secondary containment that is made of a non-corrodible material
