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tech Analytical Labs, Inc 525 Dei Rey Avenue,Suite E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> Laboratory Control Sample <br /> QC Batch# GBG2990923 Date Analyzed 09/23/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Emits µg/Liter <br /> PARAMETER Method,# MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> pg/Liter µg/Liter pg/Liter µg/Liter % R µg/Liter %R RPD j' %R <br /> Benzene 8020 <0 50 40 1 ND 1 42 105 ; 40 100 44 1 25 67-115 <br /> tToluene 1 8020 1 <0 50 257 1 ND 28 111 28 107 1 34 25 82-122 <br /> ;Ethyl Benzene 8020 <0 50 52 1 ND 59 113 5 5 106 60 25 77-114 <br /> ;Xylenes 8020 <0 50 279 ND 32 ; 115 ; 31 111 ; 3 6 25 ; 85-125 <br /> ,Gasoline <br /> 8015 <50 0 500 ND 574 115 549 110 45 25 75-125 <br /> aaa TI T(SS)-PID 8020 I 98% 95% 93% 65-135 <br /> :aaa-TFT(SS)-FID 8015 105% 100% 97% 65-135 <br /> Definition of Terms <br /> • na Not Analv7ed in QC batch <br /> MB Method Blank <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%Recovery <br /> nc Not Calculated <br />