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3 <br /> Entech Analytical Labs,Inc 525 Del Rey Avenue,Suite E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> Volatile Organic Compounds <br /> Laboratory Control Sample <br /> QC Batch 4 SGCMS990923 Date analyzed 09/24/99 <br /> Matrix Soil Spiked Sample Blank Spike <br /> Units µg/kg <br /> PARAMETER Method#f SA SR SP SP SPD SPD RPD QC LIMITS <br /> pg/kg pg/kg lag/kg %R µ8/kg %R RPD <br /> 11,1-Dichloroethene 1 <br /> 8240/826025 I ND 19 1 78 1 18 1 25 70-130 <br /> ' <br /> 1 , 72 7 5 1 1 ; <br /> 1 <br /> Benzene 8240/8260 ,1 25 ND 27 110 26 102 68 11 25 1 70-130 <br /> I 1 1 1 1 1 1 1 1 1 1 <br /> Trichloroethene 1 8240/8260 25 ND 1 29 117 28 113 1 35 1 25 1 70-130 ; <br /> t I 1 1 ! 1 1 4 1 1 1 <br /> Toluene 1 8240/8260 25 ; ND 1 28 113 26 I 106 66 1 25 1 70-130 1 <br /> ;Chlorobenzene I 8240/8260 1 25 1 ND 1 29 1 115 1 27 1 109 1 5 3 1 25 1 70-130 <br /> t 1 1 <br /> t 1 1 1 1 1 1 <br /> 'Surrogates <br /> lDibromofluoromethane ; 8240/8260 1 _ 1 76% 118% ; 1 111% 1 1 1 1 65-135 <br /> 1 <br /> 1 1 0 1 1 0 l 1 1 1 65-135 1 <br /> .'1,2-Dichloroethane , 8240/8260 ,i 1 73% I 114% , , 111/o <br /> 'Toluene <br /> -d8 1 8240/8260 1 98% 1 125% 1 1 123% 1 l ; 1 ' <br /> 1 1 , 65-135 1 <br /> 14-Bromofluorobenzene 8240/8260 1 1 97% 1 131% 1 1 128% 1 l 1 65-135 <br /> t , 1 1 1 1 l 1 1 1 <br /> Definition of Tetras <br /> na Not Analyzed in QC batch <br /> SA Spike Added <br /> SR Sample Result <br /> RPD(%) DupIicate Analysis-Relative Percent Difference <br /> SP Spike Result <br /> SP (%R) Spike%Recovery <br /> SPD Spike Duplicate Result <br /> SPD(%R) Spike Duplicate%Recovery <br /> NC Not Calculated <br />