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(OHLAB 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 991022 Report Date 06/15/1999 <br /> CUSTOMER IT Group PROJECT Southland - Martinez ATTU. Shelby Lathrop <br /> aC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> LCS Laboratory Control Sample 09060801 06/10/1999 0434 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> ienzene 52 52 50 105 0 _ 39-150 <br /> thytbenzene 50 68 50 101 4 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 312 80 250 125 1 50-150 <br /> oluene 52 48 50 105 0 46-148 <br /> ylenes (total) 158 23 150 105 5 75-125 <br /> LCR LaboraCory Control Sample Duplicate 09060801 06/10/1999 0501 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 51 37 52 52 50 102 7 _ 39-150 <br /> 2 2 20 <br /> thylbenzene 49 14 50 68 50 98 3 32-160 <br /> 3 1 20 <br /> lethyt-t-Butyt Ether (MTBE) 305 42 312 80 250 122 2 50-150 <br /> 2 4 25 <br /> ne 50 75 52 48 50 101 5 46-148 <br /> 3 4 20 <br /> P#nes (total) 153 41 158 23 150 102 3 75-125 <br /> 3 1 20 <br /> M5 Matrix Spike 09060801 991024-22 06/10/1999 0803 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> enzene 49 26 50 0 00 98 5 39-150 <br /> thylbenzene 47 10 50 0 00 94 2 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 288 93 250 0 00 115 6 50-150 <br /> to <br /> luene 49 07 50 0 00 98 1 46-148 <br /> lenes (total) 147 85 150 0 00 98 6 75-125 <br /> MSD Matrix Spike Duplicate 09060801 991024-22 06/10/1999 1433 <br /> Parameter/Test Description QC Resutt QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 48 07 49 26 50 0 00 96 1 39-150 <br /> 2 20 <br /> 1thyLbenzene 46 87 47 10 50 0 00 93 7 32-160 <br /> 0 20 <br /> Methyl-t-Butyl Ether (MTBE) 278 68 288 93 250 0 00 111 5 50-150 <br /> 4 25 <br /> luene 48 34 49 07 50 0 00 96 7 46-148 <br /> tenes (total) 148 35 147 85 150 0 00 98 9 2075-125 <br /> 0 20 <br /> Page 11 <br /> * %=% REC, R=RPD, A=ABS Diff , D=% Diff <br /> Ilv IYl�acpyil np of vnpnsa letl tons Cglu ah cD19C[On1 et wXl uVOn �e Zisy aw 2a ,N s�dusa to nnusoe tJSJe cl 5n 111 cp [f[ 'm J[!b4 1[wt pp911rn lMid414�C Olpn cis <br /> [ iup Oolln[' I Sq�S <br /> p J q ns bos[[Ilcl I �I Go a Labo al ur>s Cue Lat n I x[S bnw I p es..p ni eli p�y I�pe Scl Iv,s [ S W 1111I.uJucl tv u able� <br /> I I S e I p pl�[y w&I O!S xl n w II[wl tl[S Cb SeJ 7 to rna w1 i epp[ 1 II 1 P[N Pat w Inpul 1 1 [a.. of Co e I 1 <br />