MULTIPLE CHEMICAL HEALTH RISK LIMITS: CANCER

Subpart 1. Scope. To evaluate the risk of cancer from multiple chemicals detected in groundwater, a cancer health risk index must be calculated using the procedure specified in this part. Subp. 2. Equation. To evaluate the risk of cancer from multiple chemicals detected in groundwater, a cancer index must be calculated using the following equation: Cancer health risk index=C 1 /cHRL 1 +C 2 /cHRL 2 +...+C N /cHRL N Where: A. C N represents the concentration expressed as µg/L of the first through Nth chemical. In the case of a chemical that is detected but cannot be quantified, C N is determined by acceptable statistical procedures. B. cHRL N represents the cancer health risk limit for the first through Nth chemical, as specified in part 4717.7860 .