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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> J*Kapreallan Engineering, Inc H Client Project ID Unocal Bulk Plant, 2835 Navy Dr, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2071114-116 Reported Aug 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/6020 8015/8020 6015/8020 8015/8020 <br /> Analyst J Villar J Villar J Villar J Villar <br /> Reporting Units ug/L ug/L ug/L ug/L <br /> Date Analyzed Aug 5, 1992 Aug 5, 1992 Aug 5, 1992 Aug 5, 1992 <br /> OC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone. N D N D N D N D <br /> . Spike Conc <br /> Added, 10 10 10 30 <br /> Conc Matrix <br /> Spike. 91 94 90 27 <br /> Matrix Spike <br /> % Recovery 91 94 90 90 <br /> Conc Matrix <br /> Spike Dup 98 99 99 30 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 98 99 99 10 <br /> Relative <br /> % Difference 74 5 2 95 11 <br /> Laboratory blank contained the following analytes None Detected <br /> SEQUO A 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 /> A }VVe �" <br /> (Conc of M S + Conc of M S D)/2 aProject Manage <br />