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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 # SGCMS981129 Date analyzed 12/02/98 <br /> Matrix Soil Spiked Sample Blank Spike <br /> Units g K <br /> PARAMETER Method# ; SA SR SP SP SPD SPD RPD QC LIMITS <br /> µ a S/ICQ µ /ICs %R o ' %R ; RPD 1 %R <br /> 11,1-Dichloroethene 8240/8260 25 1 ND 24 94 24 ~ 97 j 33 25 , 50-150 <br /> �Methvl-tert-butyl ether 8240/8260 i 25 11 ND 22 i 86 21 i 82 4 8 25 1 50-150 <br /> (Benzene i 8240/82601 25 i ND I 23 I 90 [ 22 i 89 [ 1 3 I 25 [ 50-150 I <br /> ,Tnchloroethene i 8240/8260 25 ND 23 91 i 22 88 40 25 50-150 <br /> IToluene 18240/8260 1 25 I ND i 27 I 109 I 27 I 107 I 22 I 25 I 50-150 I <br /> 1 I I I I I I I I I I I <br /> IChlorobenzene 18240/8260 I 25 I ND 1 26 1 104 1 26 1 105 1 08 1 25 1 50-150 1 <br /> 1 I I I I I E i I I I I <br /> Note LCS and LCSD results reported for the following Parameter <br /> All <br /> Acceptable LCS and LCSD results are reported when matrix interferences cause XIS and USD results to fall outside <br />• established QC limits <br /> Definition of Terms <br /> na Not Analyzed in QC batch <br /> SA Spike Added <br /> SR Sample Result <br /> RPD(%) Duplicate 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 />