Table A-1. Predicted cancer risks for the best-estimate exposure scenario based on EPA methodology

					Predicted	Oral		Oral		Inhalation 	EPA
					conc.[b]	intake		cancer		cancer		total cancer
Receptor location[a]	Chemical	(mg/L)		(mg/kg-d)	risk		risk		risk

Maximum chloroform 
concentration
			Chloroform	1.5x10-4	4.3x10-6	3x10-8		3x10-7		4x10-7

Maximum TCE 
concentration
			TCE		1.0x10-4	2.9x10-6	3x10-8		4x10-8		7x10-8
			1,1-DCE		5.6x10-6	1.6x10-7	1x10-7		2x10-7		3x10-7
			Carbon 		4.4x10-6	1.3x10-7	2x10-8		2x10-8		4x10-8
			tetrachloride								Sum =	4x10-7

Maximum 1,1-DCE and 
carbon tetrachloride 
concentrations
			TCE		8.0x10-5	2.3x10-6	2x10-8		3x10-8		5x10-8
			Chloroform	1.0x10-5	2.9x10-7	2x10-9		2x10-8		2x10-8
			1,1-DCE		1.1x10-5	3.1x10-7	2x10-7		4x10-7		6x10-7
			Carbon 		9.0x10-6	2.6x10-7	3x10-8		3x10-8		6x10-8
			tetrachloride								Sum =	7x10-7
						
						
Maximum PCE 
concentration	
			PCE		1.0x10-5	2.9x10-7	1x10-8		9x10-10		2x10-8


	
[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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