Minnesota Administrative Rules

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 =	--------------------------------------------------	× 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.

Statutory Authority:

MS s 144.12

History:

26 SR 1229; 26 SR 1395

Published Electronically:

May 11, 2009