What is the Major Spill Response Level for residential areas?

• A. 32 sf or 50 lf
• B. 160 sf or 260 lf
• C. 3 sf or 3 lf
• D. 1 sf or 1 lf

Answer: (A)

The idea behind Major Spill Response Level is to flag spills that could pose significant exposure or risk in the area around a home, so responders escalate quickly. For residential areas, the threshold is defined as a spill that covers 32 square feet or runs 50 linear feet. Meeting or exceeding either measurement means the spill is large enough to require formal, rapid actions like containment, notification, and additional resources.

Why this size matters: 32 square feet is roughly a 6-by-5 foot patch. That size can contaminate multiple surfaces or soil in a home yard or around entryways, increasing potential exposure. If the spill forms a linear spread along a boundary, a length of about 50 feet can affect a larger stretch of property or a roadway edge, again elevating risk and the need for a coordinated response.

The other options represent thresholds that aren’t used for this residential Major level—either they’re far larger (which would push the spill into a different category or a less sensitive context) or much smaller (which would imply a Minor or other lower level).