What is the MTCA Method A lead CUL for groundwater?

The MTCA Method A cleanup level (CUL) for lead in groundwater is set at 15 micrograms per liter (ug/L). This specific concentration is established to protect human health and the environment by ensuring that lead levels in groundwater do not pose significant risks to public health or aquatic life.

Lead is a heavy metal that can be toxic even at low concentrations, particularly affecting the nervous system and other vital organs. The regulations under the Model Toxics Control Act (MTCA) are designed to prevent exposure to harmful contaminants, and establishing a cleanup level helps to guide remediation efforts.

The other choices reflect higher concentrations that would not meet the protective standards set by MTCA, likely resulting in potential risks that exceed safety thresholds for health and ecological safety. Thus, the choice of 15 ug/L represents a stringent standard aimed at minimizing lead contamination in groundwater.