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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM a Concord, California 94520 <br /> Nip (415) 686-9600 a FAX (415} 686-9689 <br />. <br /> Kaprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 1060740-43 Reported Jul 11, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA8015/8020 EPA8015/8020 EPA8015/8020 EPAS015/8020 <br /> Analyst RH/JF RH/J 1= RH/JF RH/JF <br /> Reporting Units pg/L pg/L Ng/L ug/L <br /> Date Analyzed Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 <br /> OC Sample # 106-0565 106-0565 106-0565 106-0565 <br /> Sample Conc : N D N D N D N D <br /> pike Conc <br /> Added 20 20 20 60 <br /> Conc Matrix <br /> Spike 19 19 17 58 <br /> Matrix Spike <br /> %Recovery 95 95 85 97 <br /> Conc Matrix <br /> Spike Dup 19 18 18 56 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 90 90 93 <br /> Relative <br /> % Difference* 0 54 57 35 <br /> Laboratory blank contained the following analytes None Detected <br /> 41OU01A ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> `�✓ Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Belinda C Vega (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director 1060740 KEI <2> <br />