Table A-4. Calculation of the noncarcinogenic hazard index for the health-conservative exposure scenario. 

						Predicted	Water		EPA
						concentration	ingestion	hazard index
Observation point		Chemical	(mg/L)		(mg/kg-d)	(exposure/RFD)


Well 250 feet west of LLNL
 				
Maximum chloroform 
concentration	
				PCE		6.2x10-3	1.8x10-4	2x10-2
				TCE		2.6x10-1	7.4x10-3	NA
				Chloroform	5.5x10-2	1.6x10-3	2x10-1
				1,1-DCE		1.0x10-2	2.9x10-4	3x10-2
				Carbon 		7.9x10-3	2.3x10-4	3x10-1
				tetrachloride				Sum =	5x10-1
				
Maximum TCE, 1,1-DCE, 
and carbon tetrachloride 
concentrations	
				PCE		5.2x10-2	1.5x10-3	1x10-1
				TCE		4.7x10-1	1.3x10-2	NA
				Chloroform	2.0x10-2	5.7x10-4	6x10-2
				1,1-DCE		2.4x10-2	6.7x10-4	7x10-2
				Carbon 		1.8x10-2	5.3x10-4	8x10-1
				tetrachloride				Sum =	1x10-0
				
Maximum PCE 
concentration	
				PCE		2.7x10-1	7.7x10-3	8x10-1
				TCE		6.2x10-2	1.8x10-3	NA
				Chloroform	8.2x10-3	2.3x10-4	2x10-2
				1,1-DCE		1.4x10-2	4.0x10-4	4x10-2
				Carbon 		1.1x10-2	3.1x10-4	4x10-1
				tetrachloride				Sum =	1x10-0


				
Well 1 mile west of LLNL
		
Maximum chloroform 
concentration	
				PCE		5.9x10-3	1.7x10-4	2x10-2
				TCE		2.4x10-1	6.9x10-3	NA
				Chloroform	4.9x10-2	1.4x10-3	1x10-1
				1,1-DCE		1.0x10-2	2.9x10-4	3x10-2
				Carbon 		7.9x10-3	2.3x10-4	3x10-1
				tetrachloride				Sum =	5x10-1

Maximum TCE, 1,1-DCE, 
and carbon tetrachloride 
concentrations	

				PCE		5.2x10-2	1.5x10-3	1x10-1
				TCE		3.8x10-1	1.1x10-2	NA
				Chloroform	1.7x10-2	4.9x10-4	5x10-2
				1,1-DCE		2.2x10-2	6.4x10-4	7x10-2
				Carbon 		1.8x10-2	5.0x10-4	7x10-1
				tetrachloride				Sum =	1x10-0
				
Maximum PCE 
concentration	
				PCE		2.1x10-1	6.0x10-3	6x10-1
				TCE		5.8x10-2	1.7x10-3	NA
				Chloroform	7.3x10-3	2.1x10-4	2x10-2
				1,1-DCE		1.5x10-2	4.2x10-4	5x10-2
				Carbon 		1.1x10-2	3.3x10-4	5x10-1
				tetrachloride				Sum =	1x10-0
				

				
Well 2 miles west of LLNL 
				
Maximum chloroform 
concentrations	
				PCE		6.1x10-3	1.7x10-4	2x10-2
				TCE		2.3x10-1	6.6x10-3	NA
				Chloroform	4.5x10-2	1.3x10-3	1x10-1
				1,1-DCE		1.0x10-2	3.2x10-4	3x10-2
				Carbon 		7.9x10-3	1.9x10-4	3x10-1
				tetrachloride				Sum =	5x10-1
				
Maximum TCE, 1,1-DCE, 
and carbon tetrachloride 
concentrations	
				PCE		4.9x10-2	1.4x10-3	1x10-1
				TCE		3.4x10-1	9.7x10-3	NA
				Chloroform	1.6x10-2	4.6x10-4	5x10-2
				1,1-DCE		2.0x10-2	5.6x10-4	6x10-2
				Carbon 		1.5x10-2	4.4x10-4	6x10-1
				tetrachloride				Sum =	9x10-1
				
Maximum TCE, 1,1-DCE, 
and carbon tetrachloride 
concentrations	
				PCE		1.7x10-1	4.9x10-3	5x10-1
				TCE		5.6x10-2	1.6x10-3	NA
				Chloroform	6.9x10-3	2.0x10-4	2x10-2
				1,1-DCE		1.3x10-2	3.8x10-4	4x10-2
				Carbon 		1.1x10-2	3.0x10-4	4x10-1
				tetrachloride				Sum =	1x10-0
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