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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> 4SERM-West Client P'rolect ID #1572 01, Stockton <br /> 1777 Botelho Dr, Suite 260 <br /> Walnut Creek, CA 94596 <br /> Attention Bruce Pfaff QC Sample Group 2120408-418 Reported Dec 18, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 <br /> Analyst A.T AT AT A.T K Wiener <br /> Reporting Units pg/L jig/L jjg/L N9/L pg/L <br /> Date Analyzed Dec 11, 1992 Dec 11, 1992 Dec 11, 1992 Dec 11, 1992 Dec 16, 1992 <br /> QC Sample# 212-0409 212-0409 212-0409 212-0409 Matrix Blank <br /> Sample Cone N D N D N D N D N D <br /> Spike Cone. <br /> Added 20 20 20 60 300 <br /> Cone. Matrix <br /> Spike 22 22 21 61 289 <br /> Matrix Spike <br /> % Recovery: 110 110 105 102 96 <br /> Cone. Matrix <br /> Spike Dup.. 23 22 22 63 258 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 115 110 110 105 86 <br /> Relative <br /> %Difference 44 00 47 32 11 <br /> Quality Assurance Statement Ail standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Cone of M S -Cone of MSD x 100 <br /> Kenneth K F Lee (Cone of M S 7-ane of M S D)/2 <br /> Laboratory Director 2120408 ERM 4, <br />