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` SEQUOIA ANALYTICAL r <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 ,U L 8 1992 <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 QC Sample Group 206-1189 Reported Jul 2, 1992 A <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8(120 8015/8020 8015/8020 8015/8020 EPA8015 <br /> Analyst A.T A.T AT A.T K.Wimer <br /> Reporting Units pg/L ug/L fig/L res/L N9/L <br /> Date Analyzed Jun 26, 1992 Jun 26, 1992 Jun 26, 1992 Jun 26, 1992 Jul 1, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone : N D N D N D N D N D <br /> Spike Cone <br /> Added. 20 20 20 60 300 <br /> Cone. Matrix <br /> Spike: 24 22 22 69 286 <br /> Matrix Spike <br /> %Recovery: 120 110 110 115 95 <br /> Cone. Matrix <br /> Spike Dup.: 24 22 22 69 296 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 120 110 110 115 99 <br /> Relative <br /> %Difference: 00 00 00 00 34 <br /> •;SE*101U0lANALYTn1CAL %Recovery nc of M - nc of ple x 100 <br /> ike Added <br /> Relative%Ddferenoe Conc of M S -Conc of M S D x 100 <br /> O (Cone of M + of M S D)/2 <br /> Project Manager <br />