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I <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 /> QC Batch# SGCMS990420 Date analyzed 04/20/99 <br /> Matrix Soil Spiked Sample Blank Spike <br /> Units pg/Kg <br /> PARAME'I ER Method# : SA SR SP SP : SPD SPD RPD QC LIMITS <br /> gg/Kg: pg/Kg: p$/KS : %R pg/Kg: %R RPD 1 %R <br /> 1,1-Dichloroethene 4 8240/82601 25 ND 1 25 I 101 27 106 5 0 25 I 50-150 <br /> ;Methyl-tent-butylether ; 824018260 25 ND 1 26 1 105 2$ lit 1 70 25 1 50-150 <br /> ,Benzene <br /> 8240/8260; 25 ND 1 28 Ill 29 116 46 25 50-150 <br /> 1 1 s 1 I 1 1 I 1 <br /> ,Trichloroethene 8240/8260 25 ND 1 30 1 120 I 30 1 121 1 07 1 1 25 1 50-150 1 <br /> 1 I I 1 1 I 1 1 1 1 <br /> ;Toluene 1 8240/82601 25 1 ND 1 26 104 1 29 116 109 25 1 1 50-150 I <br /> l f 1 I 1 1 <br /> IChlorobenzene , 8240/82601 25 1 ND 1 26 I 103 1 28 1 1i1 I 79 25 , 50-150 , <br /> Note LCS and LCSD results re ortedfor the following Parameter <br /> X111 <br /> I <br /> IDefinition of Terms <br /> na Not Analyzed in QC batch <br /> I SA Spike Added <br /> SR Sample Result <br /> RPD(%) Duplicate Analysis-Relative Percent Difference <br /> I SP Spike Result <br /> SP(%R) Spike%Recovery <br /> SPD Spike Duplicate Result <br /> I SPD(%R) Spike Duplicate%Recovery <br /> NC Not Calculated <br /> i <br /> I <br /> I <br />