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c <br /> SEQU09A ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364-9600 FAX(415)364-9233 <br /> Exeeltecfi Client Project 113'. 1i`34913a-31,Olaik Stop 132,PC#224}35 <br /> 41674 Christy Street <br /> Reported fpr 18 <br /> Fremont,CA 94538 Q C Sample Group 104-1930 <br /> 1991 <br /> Attention: Jim Rubin <br /> QUALITY CONTROL DATA REPORT <br /> t3enzene Toluene Chlaro- <br /> Chloro- <br /> ANALYTE 1,1-Dicidoraethene Trichhroetftene benzene <br /> benzene <br /> Method: EPA 8010 EPA 8010 EPA 8010 EPA 8020 EPA 8020 EPA 8020 <br /> J.Villar J.Villar J,Villar J.Villar J,Villar <br /> Analyst: J.Villar k Yg/kg Ng/kg deg/ko fjOg <br /> Reporting Units: pg/kg pg/g r 15, 1991 Apr 15. 1991 Apr 15. 1991 Apr 15, 199t <br /> Date Analyzed: Apr <br /> 16, 191 pr 15. 1911 BLK041591 BLK041591 8tX041sg1 BLK041591 <br /> QC Sample#: <br /> N.D. N.D. <br /> N.D. N.D. N.D. N.D. <br /> Sample Conc.: <br /> Spike Cone. 50 50 50 50 <br /> Added: 50 5U <br /> Cone.Matrix4S 51 53 59 <br /> Spike: <br /> 55 46 <br /> Matrix Spike 96 102 106 118 <br /> °,6 Recovery: <br /> 110 92 <br /> Cone.Matrix 45 42 43 48 50 57 <br /> Spike DuP.: <br /> Matrix Spike 114 <br /> Duplicate 84 66 96 i00 <br /> °6 Recovery: 90 <br /> Relative 11 6.1 5.8 3.4 <br /> %Difference: <br /> 20 9.i <br /> Conc.of M.S. Canc.of SamPf� x 100 <br /> SSQUOIA ANALYTICAL %ReooverySpike Cone,Added <br /> (r _ - _Conc.of M.S.-Cors.01 M.S.a. <br /> z 100 <br /> IN l`� lY✓ Relative%Ditference: (Cone,of M.S.. Core of M.S.f).)12 <br /> t041930.EhS <7> <br /> Vickie Tagu <br /> Project Manager <br />