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I Y D U A L I T Y C O N T R O L R E S U L T S Job Number 992708 Report Date 01/06/2000 CUSTOMER: {T Group PROJECT Southland - Martinez ATTN Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time Test Method EPA 80218 Batch 10428 Analyst evd Method Descr,ption Volatile Orgam cs Aromattics Units ug/L i LCS Laboratory Control Sample 09111502 F 01/04/2000 1642 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F enzene 50 05 50 100 1 39-150 thylbenzene 48 70 50 97 4 32-160 Methyl-t-Butyl Ether (MTBE) 230 42 250 92 2 50-150 Toluene 48 60 50 97 2 46-148 ylenes (total) 155 11 150 103 4 75-125 LCD Laboratory Control Sample Duplicate 09111502 01/04/2000 1708 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 50 59 50 05 50 101 2 39-150 1 1 20 benzene 49.37 48 70 50 98 7 32-160 1 4 2D Oepthyt-t-Butyt Ether (MTBE) 254 31 230 42 250 101 7 50-150 9 9 25 Lenes uene 49 34 48 60 50 98 7 46-148 1 5 20 (total) 158 02 155 11 150 105 3 75-125 1 9 20 MB Method Blank 01/04/2000 1800 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F enzene 0 00 thylbenzene 0 00 Methyl-t-Butyl Ether (MTBE) 0 00 Toluene 0 00 ylenes (total) 0 00 M5 Matrix 5pike i 04111501 992709-4 01/04/2000 1944 ' Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 49 11 50 0 00 98 2 39-150 Ethylbenzene 47 42 50 0 00 94 8 32-160 Rethyl7t-Butyl Ether (MTBE) 280 42 250 3 75 110 7 50-150 oluene 47 31 50 0 00 94.6 46-148 yLenes (total) 151 79 150 0 00 101 2 75-125 I 1j I f �I' `+ I I I + � I AII=ABIS f Diff D=x Diff" IPae 5REC, RR � i f {i f