It’s important to understand that a Slug Control Plan differs from a Spill Prevention, Control, and Countermeasure (SPCC) plan. An SPCC plan deals exclusively with oil storage. A slug control plan, on the other hand, is broader and covers any chemicals released into a sewer that could damage wastewater treatment facilities.
If your facility has an SPCC Plan, it is likely that a Slug Control Plan is also required. You can think of a slug control plan as an additional safety measure to protect your facility, community, and the environment.
Additionally, secondary containment systems are also required with an SPCC and a Slug Control Plan. Per Metropolitan Water Reclamation District of Greater Chicago (MWRD) rules, secondary containment volume must be enough to hold 100% of the volume of the largest tank in the containment area.
Secondary containment can be active or passive:
- Active secondary containment is when facility personnel physically contain a spill with a spill kit or by shutting off a pump/valve to prevent chemicals from being released.
- Passive secondary containment is when tanks and containers are placed on spill pallets or in a curbed area without floor drains. A building footprint can also act as secondary containment if no floor drains are present.
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*A slug control plan is required per the MWRD Sewage and Waste Control Ordinance, Article V, Section 4.