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z. LAWRENCE LIVERMORE NATIONAL LABORATORY -SITE 300 Hazardous Waste Facility EPA ID No. CA 2890090002 Post -Closure Permit Effective Date: April 3, 2003 Page 13 of 13 Table 1. Continued Constituent of Concern Analytical Methods Analytical RL Well W-829-15 CL/SL Well W-829-22 CL%SL Unit of Measure 1,1,1 -Trichloroethane EPA 624 0.5 <rl/r1 <rl/rl pg/L Tetrachloroethene EPA 624 0.5 <rl/rl <rl/rl pg/L Toluene EPA 624 0.3 <rl/rl <rl/rl pg/L Benzene EPA 624 0.3 <0.5/0.5 <rl/rl pg/L Ethylbenzene EPA 624 0.3 <rl/rl <rl/rl pg/L 1,2-Dichloroethane EPA 624 0.5 <rl/rl <rl/rl pg/L Chloroform EPA 624 0.5 <rl/rl <rl/rl pg/L Total xylene isomers EPA 624 0.2 <rl/rl <rl/rl pg/L Trichloroethene EPA 624 0.5 <rl/rl <rl/rl pg/L 1, 1 -Dichloroethene EPA 624 0.5 <rl/rl <rl/rl pg/L cis-1,2-Dichloroethene EPA 624 0.5 <rl/rl <rl/rl pg/L trans-1,2-Dichloroethene EPA 624 1 <rl/rl <rl/rl pg/L 1,2-Dichloroethene (total) EPA 624 0.5 <rl/rl <rl/rl p.g/L Bis(2-ethylhexyl)phthalate EPA 625 5 <5/5 <rl/rl pg/L Freon 113 EPA 624 0.5 <rl/rl <rl/rl pg/L Carbon disulfide EPA 624 5 <rl/rl <rl/rl pg/L Dichlorodifluoromethane EPA 624 0.5 <rl/rl <rl/rl pg/L Phenols EPA 625 5 <rl/rl <rl/rl pg/L Trichlorofluoromethane EPA 624 0.5 <rl/rl <rl/rl pg/L Gross alpha EPA 900 1 pCi/L 2/2.68 <2/2 pCi/L Gross beta EPA 900 1 pCi/L 44/112 7.7/13.4 pCi/L M t a Or equivalent EPA -approved method. b HMX is octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine. C TNT is 2,4,6 -trinitrotoluene. d RDX is hexahydro-1,3,5-trinitro-1,3,5-triazine. P e CL is defined as the average background concentration of a Constituent of Concern. f SL is statistically determined limit of a Constituent of Concern. 9 Gross alpha and gross beta are surrogates for 125Sb, 137Cs, 60Co, 22N2, 90Sr, 2047, and 232Th.