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:. SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Caprealian Engineering, Inc Client Project ID Former Unocal Bulk Plant #0950, Stockton <br /> 2401 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E CC Sample Group 3030009-015 Reported Mar 11, 1993 <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 EPA 8015 <br /> Analyst J F J F J F J F K Wiener <br /> Reporting Units ug/L u9/L u9/L ug/L u9/L <br /> Date Analyzed Mar 1, 1993 Mar 1, 1993 Mar 1, 1993 Mar 1, 1993 Mar 9, 1993 <br /> CC 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 20 20 20 60 300 <br /> Conc Matrix <br /> Spike. 23 22 22 70 270 <br /> Matrix Spike <br /> °,%Recovery 115 110 110 116 90 <br /> Conc Matrix <br /> Spike Dup • 23 22 20 69 254 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 115 110 100 115 85 <br /> Relative <br /> % Difference 00 00 95 1 4 61 <br /> Laboratory blank contained the following analytes None Detected <br /> �ECUOIA 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 0 x 100 <br /> Ott eff0 (Conc of M S + Conc of MSD)/2 <br /> Project Manager 3030009 KEI <5> <br />