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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Applied GeoSystems (Sacramento) Client Project ID Arco#2130-90-1/Stockton <br /> 4191 E Power Inn Rd <br /> Sacramento, CA 95826 <br /> Attention Eloise Frick QC Sample Group 1060503-509 Reported Jun 27, 1991 <br /> 1 i <br /> QUALITY CONTROL DATA REPORT <br /> J1 ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPAS015/8020 EPA8015/8020 EPAS015/802D EPAS015/8020 <br /> Analyst JF/KL JF/KL JF/KL JF/KL <br /> Reporting Unas mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Jun 25, 1991 Jun 25, 1991 Jun 25, 1991 Jun 25, 1991 <br /> QC Sample# BLK062191 M BLK062191 M BLK062191 M BLK062191 M <br /> Sample Cone : N D N D N D N D <br /> i <br /> Spike Cone. <br /> Added: 040 040 040 12 <br /> Cone. Matrix <br /> Spike: 034 033 034 10 <br /> Matrix Spike <br /> %Recovery: 85 83 85 83 <br /> Cone. Matrix <br /> Spike Dup.: 036 034 035 10 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 85 88 83 <br /> Relative <br /> % Difference: 57 30 29 0 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> qEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> 6JPL <br /> isR Malerstein (Cone of M S + Conc of M S D) 2 <br /> ject Manager 1060603 APS <5> <br />