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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM 0 Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> prealian Engineering, (nc Client Project ID Unocal,5606 Pacific Ave, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> 'Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2100027-30 Reported Oct 12, 1992 <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 8015/8020 <br /> Analyst J F J F J F J F <br /> Reporting Units 1J9/L y9/L p9/L >19/L <br /> Date Analyzed Oct 1, 1992 Oct 1, 1992 Oct 1, 1992 Oct 1, 1992 <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 22 22 22 65 <br /> Matrix Spike <br /> %Recovery. 110 110 110 108 <br /> Conc. Matrix <br /> Spike Dup : 22 22 22 65 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 110 110 108 <br /> Relative <br /> %Difference: 00 00 00 00 <br /> OEQUOIA 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 /> y Scott A Chieff0 (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2100027 KEI <6> <br />