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i <br /> 16 LAB CORE LABORATORIES <br /> Is <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 991022 Report Date 06/15/1999 <br /> CUSTOMER IT Group PROJECT: Southland - Martinez ATTR Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> Test Method EPA 8020A Batch 6699 Analyst evd <br /> Method Description Volatile Organics -Aromatics Units ug/L <br /> MB Method Biank 06/14/3999 1142 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> enzene 0 00 <br /> thylbenzene 0 00 <br /> Methyl-t-Butyl Ether (MTBE) 0 00 <br /> Toluene 0 00 <br /> IyLenes (total) 0 00 <br /> JLC5 laboratory Control Samp€e 09060801 06/14/199+9 1257 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 52 43 50 104 9 39-150 <br /> Ethy[benzene 51 23 50 102 5 32-160 <br /> Wl-t-Butyl Ether (MTBE) 251 48 250 100 6 50-150 <br /> e 52 04 50 104 1 46-148 <br /> nes (total) 150 54 150 100 4 75-125 <br /> LCD Laboratory Control Sample Duplicate 09060801 06/14/1999 7322 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> nzene 54 21 52 43 50 108 4 39-150 <br /> 3 3 20 <br /> thyLbenzene 53 28 51 23 50 106 6 32-160 <br /> 3 9 20 <br /> thy[-t-Butyl Ether (MTBE) 261 57 251 48 250 104 6 50-150 <br /> 3 9 25 <br /> Ituene 53 98 52 04 50 108 0 46-148 <br /> 3 7 20 <br /> Xylenes (total) 156 59 150 54 150 104 4 75-125 <br />! 3 9 20 <br /> MS j Matrix Spike 09060801 991050-1 06/15/1999 0104 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Catc Result * Limits F <br /> Benzene 243 18 50 210 14 66 1 39-150 <br /> Ethylbenzene 122 98 50 76 42 93 1 32-160 <br /> t <br /> hyt-t-Butyl Ether (MTBE) 253 53 250 0 00 101 4 50-150 <br /> uene 58 02 50 0 00 116 0 46-148 <br /> enes (total) 233 92 150 97 19 91 2 75-125 <br /> Page 12 <br /> * Y=% REC, R=RPD, A=ABS Diff , D=% Diff <br />! mea aNi�xsaps on ions n �i�o rm ins arr i rr �r rear ooh M r urw ne o oar c e re r nw ea a so��n mownaso i cr v� r eoinraaar u n r1 rws u ne It arutyw ri eswu nn n os os or ire° o es <br /> r> s �s 3 n r ionsr r r ar or ca a r n m es Cc L ao r ow n n + r ni rxr or an ry war oao ar r r nr r nie a <br /> r rrr a o o y r cr , am era <br /> a o-r r s eoue„ woo � v r r m rrs rti o o > of .r rr aopa iar co �aro <br />