Minn. R. agency 144, ch. 4717, HEALTH RISK VALUES, pt. 4717.8350

Current through Register Vol. 49, No. 25, December 16, 2024

Part 4717.8350 - EQUATION FOR CALCULATION OF MHRV FOR NONCARCINOGENIC EFFECTS OF TOXICANTS

Subpart 1.Scope.

This part establishes the method for determining the multimedia health risk value (MHRV) for a noncarcinogenic effect of a toxicant emitted to the air.

Subp. 2.Equation for MHRV for noncarcinogenic effect of toxicant.

The equation for calculating a MHRV for a noncarcinogenic effect of a toxicant is:

	NOAEL or LOAEL or BMD
MHRV =	--------------------------------------------------	X 1,000
	(Uncertainty factor) (Modifying factor)

Where:

A. MHRV is expressed in units of micrograms of chemical or defined mixture of chemicals per kilogram of body weight per day ( µg/kg-day);

B. NOAEL, LOAEL, or BMD is expressed in units of milligrams of chemical or defined mixture of chemicals per kilogram body weight per day (mg/kg-day);

C. uncertainty factor and modifying factor are unitless;

D. the default value for modifying factor is one unless otherwise specified in part 4717.8250; and

E. 1,000 is a factor to convert milligrams to micrograms.

Minn. R. agency 144, ch. 4717, HEALTH RISK VALUES, pt. 4717.8350

26 SR 1229; 26 SR 1395

Statutory Authority: MS s 144.12