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r ' SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, 2835 Navy Drive, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2040920-922 Reported Apr 24, 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 8015/8020 EPA8015 <br /> Analyst K N K N K N KN A T/S f_ <br /> Reporting Units mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg <br /> Date Analyzed Apr 21, 1992 Apr 21, 1992 Apr 21, 1992 Apr 21, 1992 Apr 23, 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 040 040 040 12 900 <br /> Cork Matrix <br /> Spike 034 034 038 1 1 816 <br /> Matrix Spike <br /> % Recovery 85 85 95 92 91 <br /> Conc Matrix <br /> Spike Dup 035 034 037 1 1 80 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 88 85 93 92 90 <br /> Relative <br /> % Difference 29 00 27 00 10 <br /> Laboratory blank contained the following analytes None Detected <br /> I <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> I / Relative°h Difference Cone of M S Cone of M S D x 100 <br /> Scott A Chieff0 (Cornc of M S + Cone of M S D)/2 <br /> Project Manager 204092OKE] <3> <br />