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rr. <br /> 4P <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive Redwood City,CA 94063 <br /> '-` (415)364-9600 • FAX(415)364.9233 <br /> 3330 Data Drimental Consultants Client Project ID.-40.88-586/Charter Way Shell,Stockton <br /> Delta Environ <br /> ve <br /> }Rancho Cordova,CA 95670 <br /> Attention Hal Dihm CC Sample Group: 1075312-13 <br /> Reported. Aug S, 1991, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> . E'anzene Toluene benzene X lene� <br /> Method: EPA 8020 EPA 8020 EPA 81320 EPAao2o <br /> Analyst: L Gonzales L Gonzales L Gonzales L.Gonzale s <br /> Reporting Units: ng n <br /> Date Analyzed: Aug 1, 1991 Aug 1919.1 Aug 1.1 931 Aug 1,1991 <br /> QC Sample#: GSLK081991 GBI-Ko819g1 Ge!Kos1991 GBLNCE1991 <br /> MS/RSSD MS/MSD MS/MSD MS/MSD <br /> Sample Cone.: N.D. N.D. N.D, N.D. <br /> Spike Cone. <br /> Added: 200 200 209 600 <br /> �,;RC.Matri+r <br /> Spike: : 200 200 1ST 580 <br /> Matrix Spike <br /> Y, %Recovery: 100 9$ <br /> 97 97 <br /> Conc.Matrix <br /> Spike Dup.: 190 190 190 560 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 95 94 93 94 <br /> Relative <br /> %Difference: 5.2 4.7 4.2 3.5 <br /> SEQUOIA ANALYTICAL %Recovery: <br /> Conc.of M.S.-Conc.of Sa npte x 1 to <br /> 1 Spike Conc.Added —� <br /> Q <br /> Relative%Difference: Canc.of M.S.-Conc.of M.S.D, x 10q <br /> Mal er4ne -l?ng r _ <br /> Project Manager {C-0nc.of M.S. +Conc,01 M.S.D.)/2 <br /> 1075312.DLT <2> <br />