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r , SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord, Caiifornia 94520 <br /> lop (415) 686-9600 0 FAX (415) 686-9689 <br /> i . . <br /> Applied'GeoSystems (Sacramento) Client Project lD ARCO #760/#760-91-1 <br /> 4191 E Power inn Rd <br /> Sacramento, CA 95826 <br /> Attention Eloise Frick QC Sample Group 106-0575 Reported Jun 24, 1991 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead Hexavalent Chromium <br /> Method EPA 7421 EPA 7196 <br /> Analyst V Patel Badn Ali <br /> Reporting Units mg/kg mg/kg <br /> Date Analyzed Jun 24, 1991 Jun 22, 1991 <br /> QC Sample # 106-2331 106-3267 <br /> Sample Cone. 50 N D <br /> Spike Cone. <br /> Added- 50 50 <br /> Cone Matrix <br /> Spike 57 56 <br /> Matrix Spike <br /> %Recovery: 100 110 <br /> Cone. Matrix <br /> Spike Dup.- 57 56 <br /> Matrix Spike <br /> Duplicate - <br /> % Recovery. 100 110 <br /> Relative <br /> %Difference: 0 0 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> iSEQUOIA ANALYT AL %Recovery cont of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Drfference Conc of MS -Cone of M S D x 100 <br /> J Iia R Malerstein (Cone of M S + Conc of M S D) 2 <br /> P oiect Manager 1060575 APS `11' <br />