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- - -_� SEQUOIA -ANALYTICAL - - <br /> D1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Applied GeoSystems (Sacramento) Client Project iD ARCO #760/#760-91-1 <br /> 4191 E Power Inn Rd <br /> { Sacramento, CA 95826 <br /> Attention Eloise Frick QC Sample Group 1060576-79 Reported Jun 24, 1991 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA8015/8020 EPAS015/8020 EPAS015/8020 EPA8015/8020 <br /> Analyst RH/JF RH/JF RH/JF RH/JF <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Jun 20, 1991 Jun 20, 1991 Jun 20, 1991 Jun 20, 1991 <br /> QC Sample# BLK062091 BLK062091 BLK062091 BLK062091 <br /> Sample Conc : N D N D N D N D <br /> Spike Conc <br /> Added: 040 040 040 12 <br /> Conc Matrix <br /> Spike 040 040 044 13 <br /> Matrix Spike <br /> %Recovery: 100 100 110 110 <br /> Conc Matrix <br /> Spike Dup.- 040 038 044 1 3 <br /> Matrix Spike <br /> Duplicate - - <br /> %Recovery: 100 95 110 110 <br /> Relative <br /> %Difference: 0 51 0 0 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANAL ICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M SO x 100 <br /> + Conc of 2 <br /> J i R Malerstein (Conc of M S Co i <br /> 1060575 APS 418> <br /> P ject Manager <br />