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1 <br /> COULAB CORE LABORATORIES <br /> Q U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 990890 Report Date 05/26/1999 <br />' CUSTOMER. IT Group PROJECT: Southland - Martinez ATTN Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> LCs Laboratory Control sample 09043002 05/22!1999 0623 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc. Result * Limits <br /> Benzene 51 64 50 103 3 39-150 <br /> Ethylbenzene 49 30 50 98 6 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 311 52 250 124 6 50-150 <br /> Toluene 51 42 50 102 8 46-148 <br /> ylenes (total) 153 96 150 102 6 75-125 <br /> LCD laboratory Control Sample Duplicate 09043002 05/22/1999 0649 <br /> Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits <br /> Benzene 49 38 51 64 50 98 8 39-150 <br /> 4 S 20 <br /> thylbenzene 47 06 49 30 50 94 1 32-160 <br /> 4 6 20 <br /> tethyL-t-Butyt Ether (MTBE) 289 84 311 52 250 115 9 50-150 <br /> 7 2 25 <br /> ene 49 OS 51 42 50 98 2 46-148 <br /> 4 7 20 <br /> nes (total) 146 96 153 96 150 98 0 75-125 <br /> 4 7 20 <br /> MS Matrix spike 09043001 990890-3 F 05,122/1999 1227 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> enzene 51 17 50 0 00 102 3 39-150 <br /> thylbenzene 48 50 50 0 00 97 0 32-160 <br /> Methyt-t-Butyl Ether (MTBE) 292 92 250 0 00 117 2 50-150 <br /> Toluene 50 78 50 0 00 101 6 46-148 <br /> FyLenes (total) 152 81 150 0 00 101 9 75-125 <br /> MSD Matrix Spike Duplicate 09043001 990890-3 05/22/1999 1253 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br />'Benzene 52 20 51 17 50 0 00 104 4 _ 39-150 <br /> 2 20 <br /> thylbenzene 49 31 48 50 50 0 00 98 6 32-160 <br /> 2 20 <br /> lethyt-t-Butyl Ether (MTBE) 319 43 292 92 250 0 00 127 8 50-150 <br /> 9 25 <br /> Toluene 51 90 50 78 50 0 00 103 8 46-148 <br /> 2 20 <br /> ylenes (total) 154 90 152 81 150 0 00 103 3 75-125 <br /> 1 20 <br /> ' Page 6 <br /> * %=% REC, R=RPD, A=ABS Diff D=% Diff <br /> a iy,c 1 yvi, , iIc 1, ,111 11 —111 <br /> GG 5 Lo , , L t it 5c awn ,w 9s a n z oon [[ a on wlsv n r[i irl 1 nv I51'f i TMIy i 5 na u s 1' e t! 1 r fH iM ltN 1 t u r lar r s o, <br /> ai qac Kia Esc ori „se,o snv „s ,. Tn m,„, <br />