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Entech Analytical Labs, Inc 525 Del Rey Avenue,Suite E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> 1 METHOD Gas Chromatography <br /> QC Batch# GBG2990405 Date Analyzed 04/05/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units Ag1L <br /> PARAMETER : Method# : MB SA SR SP SP SPD SPD RPD : QC LIMITS <br /> pg/L µg/l, 99(L. 49/1 % R ; 3083 %R RPD I %R <br /> 'Benzene 1 8020 I <0 50 1 40 I ND 1 37 I 91 1 38 1 951 3 8 I 25 1 81-115 1 <br /> 1 1 1 1 1 1 1 1 1 1 1 1 1 <br /> ;Toluene 8020 1 <0 50 40 ND 36 89 38 95 16 25 82-114 <br /> 1 1 1 I 1 1 1 1 1 1 1 1 1 <br /> 'Ethyl Benzene ; 8020 1 <0 50 1 40 1 ND l 36 1 91 1 38 1 95 1 5 2 l 25 1 81-115 1 <br /> 'Xylenes 1 8020 1 <0 50 1 120 1 ND I 111 1 92 1 115 I 96 1 3 6 1 25 I 84-114 1 <br /> 1 1 4 1 1 1 1 1 [ 1 1 1 1 <br /> 1 1 1 1 1 1 1 1 1 1 1 <br /> ;Gasoline ; 8015 [ 1; <50 0 ; 500 ; ND ; 428 ; 86 ; 427 ; 85 0 2 ; 25 ; 75-125 ; <br /> Note LCS and LCSD results reported for the following Parameters <br /> All <br /> Definition of Terms <br /> na Not Analyzed 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 />