Table A-3. Calculation of the noncarcinogenic hazard index for the best-estimate exposure scenario.

					Predicted	Water		EPA
					concentrationb	ingestion	hazard index
Observation pointa	Chemical	(mg/L)		(mg/kg-d)	(exposure/Rfd)

Maximum chloroform 
concentration	
			Chloroform	1.5x10-4	4.3x10-6	4.3x10-4
				
Maximum TCE 
concentration	
			TCE		1.0x10-4	2.9x10-6	NA
			1,1-DCE		5.6x10-6	1.6x10-7	1.8x10-5
			Carbon 		4.4x10-6	1.3x10-7	1.8x10-4
			tetrachloride				Sum =	2.0x10-4
					
					
Maximum carbon 
tetrachloride and 1,1-DCE 
concentrations	
			Chloroform	2.0x10-5	5.7x10-7	5.7x10-5
			1,1-DCE		4.5x10-5	1.3x10-6	1.4x10-4
			Carbon 		3.5x10-5	1.0x10-7	1.4x10-3
			tetrachloride				Sum =	1.6x10-3
				
Maximum PCE 
concentration	
			PCE		1.0x10-5	2.9x10-7	2.9x10-5


NA = Not available.

	
[a] All receptor wells are 2 miles west of LLNL.
	
[b] Predicted maximum ground water concentrations have been reduced by a factor
of ten to account for in-well dilution that would occur because the municipal
well would draw water from both contaminated and uncontaminated zones.

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