(i) is below-grade piping that operates under atmospheric pressure;
(ii) slopes enough that the product in the pipe can drain back into the tank when suction is released; and
iii) has only one check valve, which is as close as possible beneath the pump in the dispensing unit.
These enhanced requirements emanate from a final EPA rule released last summer. NATSO’s detailed memorandum summarizing this rule is available here.
Click on the link titled “Operating and Maintaining Underground Storage Tanks.”
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