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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc x Client Protect IDUnocal, 2835 Navy Dnve , Stockton <br /> .2401 Stanwell Drive <br /> Concord, CA 94520 <br /> Attention Mardo Kapreallan, P E QC Sample Group 2041289-1292 Reported May 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8024 8015/8020 8015/8020 EPA8015 <br /> Analyst K E K E K E K E A Tuzon <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Apr 30, 1992 Apr 30, 1992 Apr 30, 1992 Apr 30, 1992 Apr 30, 1992 <br /> QC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc : N D N D N D N D N D <br /> Spike Conc. <br /> Added 040 040 040 1 2 10 <br /> Conc. Matrix <br /> Spike: 039 044 044 12 84 <br /> Matrix Spike <br /> %Recovery: 98 110 110 100 84 <br /> Conc. Matrix <br /> Spike Dup.: 036 043 043 12 91 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery. 90 108 108 100 91 <br /> Relative <br /> % Difference 80 23 23 00 40 <br /> Laboratory Blank contained the following analytes None detected <br /> &EQUOIA 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 /> S tt A Chia o (Cone of M + Cone of M 0)7-2 <br /> 2 <br /> Prosect Manager 2041289 KE <3> <br />