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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> V6P (510) 686-9600 FAX (510) 686-9689 <br /> W-"preaifiih r':ngirieering, Inc V` 'Clieni project 1D Unocal, 5606 Pacific Ave, StocktonV <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2060126-129 Reported Jun 17, 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 8015/8024 <br /> Analyst J F J F J F J F <br /> Reporting Units pg/L p9/L p9/L ps/L <br /> Date Analyzed Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 <br /> QC 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- 25 24 23 68 <br /> Matrix Spike <br /> %Recovery. 125 120 115 113 <br /> Conc. Matrix <br /> Spike Dup : 24 24 23 67 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 120 120 115 112 <br /> Relative <br /> oro Difference: 41 00 00 15 <br /> Laboratory blank contained the following analytes None Detected <br /> OEQ OIA 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 /> Scott A Chleffo (Conc of M S + Conc of M S D)/2 7 <br /> Project Manager <br />