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0 <br /> r+ <br /> ` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord, California 94520 <br /> WWW (510) 686-9066 • FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, Stocton,7303 Pacific Ave <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 10921655-8 Reported Oct 17, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel Oil and Grease <br /> EPA EPA EPA EPA <br /> Method 8015/80120 8015/8020 8015/8020 8015/8020 EPAS015 SM5520 <br /> Analyst R H/J F R H/J F R H/J F R H/J F A Tuzon D Newcomb <br /> Reporting Units ug/L ug/L ug/L ug/L ug/L mg/Kg <br /> Date Analyzed Oct 4, 1991 Oct 4, 1991 Oct 4, 1991 Oct 4, 1991 Oct 8, 1991 Oct 7, 1991 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank BLK100791 MB100891 <br /> Sample Conc N D N D N D N D N D N D <br /> Spike Conc <br /> Added 20 20 20 60 300 100 <br /> Conc Matrix <br /> Spike 24 21 19 59 220 88 <br /> Matrix Spike <br /> %Recovery 120 110 95 98 73 88 <br /> Conc Matrix <br /> Spike Dup 24 20 19 60 240 87 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 120 100 95 100 81 87 <br /> Relative <br /> %Difference 0 49 0 1 7 95 1 <br /> Laboratory blank contained the following analytes None Detected <br /> . SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Belinda C Vega (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 1092165 KEI <6 <br />