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O SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kapreallan'Engine- ring, Inc Client Project ID Unocal #5421, 7303 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2110460-516 Reported Nov 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes Diesel Diesel Oil and Grease <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 EPA8015 SM 5520 EF <br /> Analyst J F J F J F J F K Wimer K Wimer D Newcomb <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 19, 1992 Nov 23, 1992 Nov 17, 1992 <br /> QC Sample# 211-0692 211-0692 211-0692 211-0692 Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone N D N D N D N D N D N D N D <br />. Spike Cone <br /> Added. 040 040 040 1 2 10 10 5000 <br /> Cone Matrix <br /> Spike 040 042 044 14 91 93 4800 <br /> Matrix Spike <br /> % Recovery, 100 105 110 116 91 93 96 <br /> Cone Matrix <br /> Spike Dup 039 042 043 1 4 94 96 4700 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 98 105 107 116 94 96 94 <br /> Relative <br /> %Difference 25 00 23 00 32 32 20 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Laboratory Blank contained the following analytes None detected <br />. SE OIA ANALYTI L %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> colt A Chleffo (Cone of M S + Cone of MSD)/2 <br /> Project Manager 2110502 KEI <18> <br />