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1 <br /> i <br /> 16 COULAB CORE LABORATORIES <br /> Q U A L I T Y C O N T R O L R E S U L T S <br /> Job Number 991123 Report Date 06/30/1999 <br /> CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> Test Method EPA 8020A Batch 6980 Analyst evd <br /> Method Description Volatile Organics -Aromatics Units ug/L <br /> MB Method Blank 06/29/1999 023b <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> enzene 0 00 _ y <br /> thylbenzene 0 00 <br /> Methyl-t-Butyl Ether (MTBE) 0 00 <br /> Toluene 0 00 <br /> ly(enes (total) 0 00 <br /> LCS Laboratory Control Sample 09062503 06/29/1999 0353 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 51 73 50 103 5 39-150 <br /> Oley' <br /> benzene 51 01 50 102 0 32-160 <br /> l-t-Butyl Ether (MTBE) 251 57 250 100 6 50-150 <br /> ne 52 23 50 104 5 46-148 <br /> es (total) 151 14 150 100 8 75-125 <br /> LCD Laboratory Control Sample Duplicate 09062503 06/29/1999 0419 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> nzene 50 77 51 73 50 101 5 39-150 <br /> 1 9 20 <br /> tthyLbenzene 49 88 51 01 50 99 8 32-160 <br /> 2 2 20 <br /> [thy[-t-Butyl Ether (MTBE) 254 49 251 57 250 101 8 50-150 <br /> 1 2 25 <br /> luene 51 24 52 23 50 102 5 46-148 <br /> 1 9 20 <br /> Xylenes (total) 147 80 151 14 150 98 5 75-125 <br /> 1 2 2 20 <br /> MS Matrix Spike 09062503 991104-1 06/29/1999 1752 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 50 62 50 0 00 101 2 _ 39-150 <br /> Ethylbenzene 49 36 50 0 00 98 7 32-160 <br /> kthyl-t-Butyl Ether (MTBE) 226 75 250 0 00 90 7 50-150 <br /> luene 50 90 50 0 00 101 8 46-148 <br /> lenes (total) 144 99 150 0 00 96 7 75.125 <br /> 1 <br /> Page 16 <br /> * %=% REC, R=RPD, A=ABS Diff , D=Y, Diff <br /> ' me enaly[gat resorts E—W <br /> erpretacmianea reportaears.re insngney—I , of 'Hw0 —''ln, A . f any 1y l gas Coal Or Omer pr0[�MY w0il D<sa 0 n nation w1h wfi cn supry Bpwt a use(2 a sled upon for any a ori wfiel4oever TME" <br /> sl MI not De raaPMoep n nolo a n p0n w Input th0 nr tt en ap Mp at et Cp a Iahoratp es <br />