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- j SEQUOIA-ANALYTICAL - <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> AppliedtGeoSystems (Sacramento) Client Project ID ARCO #760/#760-91-1 <br /> }4191 E Power Inn Rd <br /> Sacramento, CA 95826 <br /> { Attention Eloise Prick OC Sample Group 106-0575 Reported Jun 24, 1991 <br /> A <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPAS015/8020 EPAS015/8020 EPA8015/8020 EPA8015/8020 <br /> Analyst D Droblow D Droblow D Droblow D Droblow <br /> Reporting Units ng ng ng ng <br /> Date Analyzed Jun 24, 1991 Jun 24, 1991 Jun 24, 1991 Jun 24, 1991 <br /> CC Sample# GSTDO62491 GSTDO62491 GSTDO62491 GSTDO62491 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Conc N D N D N D N D <br /> Spike Conc. <br /> Added: 100 100 100 300 <br /> Conc. Matrix <br /> Spike. 100 100 97 300 <br /> Matrix Spike <br /> % Recovery: 100 100 97 100 <br /> Conc. Matrix <br /> Spike Dup : 97 93 90 280 <br /> Matrix Spike <br /> Duplicate — <br /> %Recovery 97 93 90 93 <br /> Relative <br /> %Difference: 30 73 75 69 <br /> ,Duality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 4kEQr011A AN LYTI L %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Dtfferenoe Conc of M S -Cana of M S D x 100 <br /> J Il <br /> eln (Conc of MS + Conc of M S D)/2 <br /> P oject Manager 1060575 APs <20' <br />