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SEQUOIA ANALYTICAL _ <br /> 1900 Bates Avenue a Suite LM • Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Applied GeoSystems (Sacramento) Client Project ID ARCO#766/#760-91-1 <br /> 4191 E Power Inn Rd <br /> v Sacramento, CA 95826 <br /> -Attention Eloise Frick QC Sample Group 106-0575 Reported Jun 24, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Od&Grease <br /> Method SM 5520 E&F <br /> Analyst V Nunzir <br /> Reporting Units mg <br /> Date Analyzed Jun 21, 1991 <br /> OC Sample # BL.K062191 <br /> Sample Cone : N D <br />• Spike Cone <br /> Added, 100 <br /> Cone Matrix <br /> Spike 87 <br /> Matrix Spike <br /> %Recovery: 87 <br /> Cone. Matrix <br /> Spike Dup 89 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 89 <br /> Relative <br /> %Difference: 23 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> EQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> kp i <br /> Spike Conc Added <br /> lative%Difference Cone of M S -Conc of M SID x 100 <br /> cip, <br /> lia WRMalersieln (Cone of M S + Conc of M S D) 2 <br /> olect Manager 1060575 APS <4' <br />