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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> ,%Qw 1 <br /> (510) 686 9600 FAX {510) 686 9689 <br /> Alton Geosclence Client Project ID Mobil #04-NP4/30-0140-02 <br /> 5870 Stoneridge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention Cyril Yong OC Sample Group 2050573-575 Reported May 14, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015t8020 EPA6015 <br /> Analyst K N K N K N K N M C <br /> Reporting Unds ug/L ug/!_ ug/L ug/L ug/L <br /> Date Analyzed May 13 1992 May 13, 1992 May 13, 1992 May 13, 1992 May 14, 1992 <br /> QC Sample# Matnx Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc <br /> Added 20 20 20 60 600 <br /> Conc Matrix <br /> Spike. 21 20 22 65 510 <br /> Matrix Spike <br /> %Recovery: 105 100 110 108 85 <br /> Conc. Matrix <br /> Spike Dup.- 18 18 19 57 510 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 90 90 95 13 95 <br /> Relative <br /> %Difference: 15 11 15 13 11 <br /> SEQUOIA ANALYTICAL %Recovery --Conc of M S Cone of Sample x 100 <br /> gp_ike Cone Added <br /> Relative 96 Difference Conc of M S -Conc of M S D x 100 <br /> !Project <br /> olt A Chleff (Cone of M + Cone of M 2 <br /> Mana 245 573 <3? <br />