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Q U A L I T Y C 0 N T R 0 L R E S U L T S Job Number 200207 Report Date 02/03/2000 CUSTOMER IT Group PROJECT Southland Martinez ATTN Rhonda Teicheira QC Type Description Reag Cade Lab ID Dilution Factor Date Time ' LCD Laboratory Control Sample Duplicate 09111502 01/28/20x0 123b Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 52 13 51 77 50 104 3 39-150 0 7 20 Ethylbenzene 51 45 50 47 50 102 9 32-160 1 9 20 �rlethyL t ButyL Ether (MTBE) 307 50 305 19 250 123 0 50-150 0 8 25 Toluene 52 01 51 39 50 104 0 46-148 1 2 20 xylenes (total) 157 23 154 27 150 104 8 75-125 1 9 20 MS Matrix Spike 09111501 200206-5 01/29/2000 0219 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F 0P � ene 47 69 50 0 00 95 4 39-150 lbenzene 46 88 50 0 00 93 8 32-160 yl-t-Butyl Ether (MTBE) 240 87 250 0 00 96 3 50-150 Toluene 47 59 50 D 00 95 2 46-148 Xylenes (total) 143 04 150 0 00 95 4 75-125 MSD Matrix Spike Duplicate 09111501 200206-5 01/29/2000 0245 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ' Benzene 47 00 47 69 50 0 00 94 0 39-150 1 20 Ethylbenzene 46 00 46 88 50 0 00 92 0 32-160 2 20 Methyl t-Butyl Ether (MTBE) 251 28 240 87 250 0 00 100 5 50-15D 4 25 Toluene 46 62 47 59 50 0 00 93 2 46-148 2 20 xylenes (total) 140 46 143 04 150 0 00 93 6 75-125 2 20 =TestMethod EPA 80216 Batch 10847 Analyst evdription Volatile Organics -Aromatics Units ug/L ' MB Method Blank 01/31/2000 1213 Parameter/Test Description QC Result QC Result 'true Value Orig Value Calc Result * Limits F Benzene 0 00 Ethylbenzene 0 00 ' Methyl-t-Butyl Ether (MTBE) 0 00 ene 0 00 nes (total) 0 00 Page 7 * %=X REC, R=RPD, A=ABS Diff D=X Diff