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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 * Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> rFiESNA Industries H-x Y n r+r r + + 4+Client Project ID f Arco#2168, Stockton x <br /> 3164 Gold Camp Dr, Suite 200 <br /> 'Rancho Cordova, CA 95670 <br /> }'Attention Eloise Cherven QC Sample Group 205-0324 Reported May 20, 1992 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethyl benzene Toluene <br /> 1 <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed May 19, 1992 May 19, 1992 May 19, 1992 May 19, 1992 <br /> 1 QC Sample# BLK051992 BLK051992 BLK051992 BLK051992 <br /> Sample Cone• N D N D N D N D <br /> Spike Cone <br /> Added 02 02 02 04 <br /> Cone Matrix <br /> Spike: 017 018 018 036 <br /> 1 <br /> Matrix Spike <br /> %Recovery: 85 90 90 90 <br /> Cone Matrix <br /> 1 Spike Dup 017 018 018 037 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 90 90 92 <br /> 1 Relative <br /> %Difference- 00 00 00 27 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 1 <br /> SEQUOIA ANALYTIC�L %Recovery Cone of M S -Cone of Sample x 100 <br /> A, Spike Conc Added <br /> 7Relative%Difference Cone cf M S -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2050324 RES <2> <br />