What is the best course of action when lead is detected in sandbox sand at a concentration of 600 ppm?

When lead is detected in sandbox sand at a concentration of 600 parts per million (ppm), the most responsible course of action is to remove the sandbox and relocate it. This approach ensures the safety of children who use the sandbox, as exposure to lead, even at relatively low levels, can pose significant health risks, particularly for young children who are more vulnerable to the toxic effects of lead. Lead exposure can lead to developmental issues, learning disabilities, and other serious health problems.

The decision to remove the sandbox prevents any further potential lead exposure to children who may play in the area. It addresses the immediate hazard and promotes a safer environment. Options like installing warning signs or allowing limited use by older children do not adequately mitigate the risk, as they don't eliminate the source of lead contamination. Simply leaving the sandbox in place with no action taken would also fail to protect children from exposure to lead, which is a serious health concern.