Section 1: Introduction to the RainDrain System
Overview
RainDrain Operations Manual
(Version D)
2
We Engineer Solutions
Warning
In the event of a catastrophic failure of a primary containment tank (that is secured within a
secondary containment berm and protected by the RainDrain), the subsequent spill of a significant
amount of fuel will cause the filter to shut down automatically. It is still possible that a small
amount of fuel will escape through the RainDrain because of the higher fuel to water discharge
ratio. This discharge can be trapped in a small discharge pit filled with hydrocarbon absorbent
pads.
Important Note
The RainDrain is designed to limit discharge contamination to below 10 mg/L total extractable
hydrocarbons at an inlet contamination level of 1% or less fuel in water.
For fuel levels above 1% solution, the RainDrain will seal but some contaminants will be
discharged above 15 parts per million free oil.