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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM * Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> WlilVl-West'{Walnut Creek) Client Pio'ject iD #157201, Stockton n n nN H V <br /> 1777 Botelho Dr, Sulte 260 <br /> Walnut Creek, CA 94596 <br /> Attention Bruce Pfaff QC Sample Group 2060092-102 Reported Jun 19, 1992 <br /> r rhi ♦S♦ v r n. . . r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Organic <br /> Benzene Toluene Benzene Xylenes Diesel Lead Lead <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPAS015 LUFT EPA 2339 2 <br /> Analyst J F J F J F JF K 1Mmer K Anderson K Anderson <br /> Reporting Units N9/L Ng/L ug/L pg/L Mg/L mg/L mg/L <br /> Date Analyzed Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 Jun 15, 1992 Jun 18, 1992 Jun 19, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank 206-0092 206-0096 <br /> Sample Cone : N D N D N D N D N D N D 00095 <br /> Spike Cone <br /> Added 20 20 20 60 300 60 020 <br /> Cone. Matrix <br /> Spike 25 24 23 68 258 48 016 <br /> Matrix Spike <br /> % Recovery: 125 120 115 113 87 96 75 <br /> Cone. Matrix <br /> Spike Dup.- 24 24 23 67 270 48 015 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 120 120 115 112 90 96 70 <br /> Relative <br /> %Difference. 41 00 00 15 45 00 65 <br /> 06EQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Scott A hieffo (Cone of M S + Cone of M S D)/2 206DM2.ERM <10> <br /> Project Manager <br />