What should be done with concrete around spill-containment manholes?

Sloping the concrete around spill-containment manholes away from the manhole is a critical practice for effective spill management. This design feature helps direct rainwater and any potential spills away from the containment area, preventing the dilution of hazardous materials with rainfall and minimizing the risk of contaminants entering groundwater.

Having a slight slope ensures that water flows away from the manhole, which is vital in maintaining the integrity of the spill containment system. It effectively helps in keeping the containment area functional for its purpose, which is to capture and contain any leaks or spills from underground storage tanks. This practice is also important in regions where the collection or retention of water may create additional concerns regarding contamination or maintenance.

The other options do not support effective spill containment design. Leaving the area flat can lead to water pooling around the manhole, while keeping it level with the ground negates the drainage benefit that a slope provides. Decorating the area with plants might seem appealing, but it does not contribute to the safety or functionality of spill containment and could potentially complicate access to emergency measures if needed.