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SEQUOIA ANALYTICAL u ` <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686 9600 • FAX (5101 686 9689 <br /> Alton Geosclence Client Project iD Mobil #04-NP4/30-140-01 <br /> 1000 Burnett Street, Suite 140 <br /> Concord, CA 94520 <br /> Attention Tridib Guha OC Sample Group 1120386-398 Reported Dec 17, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8415/8020 <br /> Analyst R H R H R H R H <br /> Reporting Units ug/L ug/L ug/t- ug/L <br /> Date Analyzed Dec 12, 1991 Dec 12, 1991 Dec 12 1991 Dec 12, 1991 <br /> OC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc - N D N D N D N D <br /> Spike Conc <br /> Added- 20 20 20 60 <br /> Conc Matrix <br /> Spike 24 23 23 72 <br /> Matrix Spike <br /> % Recovery- 120 115 115 120 <br /> Conc Matrix <br /> Spike Dup : 23 22 22 67 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 115 110 110 112 <br /> Relative <br /> % Difference: 42 44 44 72 <br /> Laboratory blank contained the following analytes None Detected <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> r Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> SCo4&. C�hleff 0 (Conc of M S + Conc of M S D U 2 <br /> Project Manager <br /> 1120386.ALG c2> <br />