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r <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ERM-West (Walnut Creek) Client Project ID #1572 04 <br /> 1777 Botelho Dr, Sune 260 <br /> Walnut Creek, CA 94596 <br /> ' Attention Bruce Pfasf OC Sample Group 2040108-113 Reported Apr 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> JANALYTE Ethyl- Organic <br /> Benzene Toluene Benzene Xylenes Diesel Lead Lead <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPAS015 LUFT EPA 7421 <br /> AnalystK E K E K E K E A.Tuzon K Anderson 08 <br /> Reporting Units ug/L ug/L ug/L ug/L mg/L mg/L mg/L <br /> Date Analyzed Apr 14 1992 Apr 14, 1992 Apr 14, 1992 Apr 14, 1992 Apr 16, 1992 Apr 14 1992 Apr 21, 1992 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank 204-0108 204-0109 <br /> Sample Conc.. N D N D N D N D N D N D N D <br /> Spike Conc <br /> Added. 20 20 20 60 300 25 010 <br />' Conc Matrix <br /> Spike 22 21 21 61 220 27 012 <br /> rMatrix Spike <br /> % Recovery 110 105 105 102 74 108 120 <br /> Conc. Matrix <br /> Spike Dup.. 23 22 21 63 260 26 Oil <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 115 110 105 105 86 104 106 <br /> Relative <br /> %Difference 00 00 00 00 15 38 12 <br /> SEQUOIA ANALYTICALRecovery C one of M S - nc of Sample x 100 <br /> Spike Cone Added <br /> Palatme Difference Conc of M S -Conc of M S D x 100 <br /> Kenneth K F Lee (Cone of + Cone of 2 <br />' Laboratory Manager 2040108 ERM <s> <br />