Table 1. Remediation standards and State discharge limits for compounds of concern in ground water at the LLNL site.

			  Concentration limit for drinking water[a]


							Pre-remediation 
							concentration 
							range at LLNL, 
			Federal		California 	March 1990-		Discharge limit[b] for 
			MCL		MCL 		March 1991 		treated water 
Constituent		(ppb)		(ppb)		(ppb)			(ppb)

PCE			5		5		<0.1-1,050		4

TCE			5		5		<0.1-4,800		5

1,1-DCE			7		6		<0.5-370		5

cis-1,2-DCE		70		6		<0.5-24			5 (total 1,2-DCE)

trans-1,2-DCE		100		10		<0.5-1			5 

1,1-DCA			--		5		<0.5-60			5

1,2-DCA			5		0.5		<0.1-190		5

Carbon tetrachloride	5		0.5		<0.1-91			5

Total THM[c] 		100[c]		100[c]		<0.5-270		5

Benzene			5		1.0		<0.1-4,600		0.7

Ethyl benzene		700		680		<0.2-610		5

Toluene			1,000		--		<0.5-4,200		5

Xylenes (total)		10,000		1,750[d]	<0.5-3,700		5

Ethylene dibromide	0.05		0.02		<0.1-51			0.02

Total VOCs		--		--	 	up to 5,808		5

Chromium+3 		50(total Cr)[e]	50 (total Cr)	<5-150 (total Cr)	50 (total Cr)

Chromium+6 		50(total Cr)[e]	50 (total Cr)	<10-140			11

Lead			15[f]		50		<2-10			5.6

Tritium[g]		20,000 pCi/L	20,000 pCi/L	<200-33,100		[h]



	
[a]  Human receptor.  The more stringent concentration limits on this part of the
table are shown in a larger typeface to illustrate that LLNL will comply with
the most stringent requirements.
	
[b]  From National Pollutant Discharge Elimination System (NPDES) Permit No.
CA0029289 (revised 8/1/90) and RWQCB Order No. 91-091.  Of the LLNL compounds
of concern, VOC-specific State discharge limits exist in RWQCB Order No. 91-091
only for PCE (4 ppb), benzene (0.7 ppb), and ethylene dibromide (0.02 ppb).
Other VOCs listed in this table are included in the 5 ppb total VOC limit.
Discharge limits for metals differ slightly according to discharge location.
	
[c]  Total trihalomethanes (THMs); includes chloroform, bromoform,
chlorodibromomethane,  and bromodichloromethane (California Drinking Water
Requirement).
	
[d]  MCL is for either a single isomer or the sum of the ortho, meta, and para
isomers.
	
[e]  National Interim Primary Drinking Water Regulation for total chromium is
presently 50 ppb, but will increase to 100 ppb in July 1992.  No MCLs exist for
Cr+3 or Cr+6.
	
[f]  National Primary Drinking Water Regulation Enforceable Action Level (Federal
Register, volume 56, number 110, June 7, 1991, p. 26460).
	
[g]  The RI shows that ground water in the one well that currently exceeds the
tritium MCL will be naturally remediated ong before it migrates offsite.
	
[h]  There is currently no NPDES discharge limit for tritium.  LLNL will use the
MCL for tritium as the discharge limit.





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