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SEQUOIA ANALYTICAL <br /> 819 Sulker Avenue, Suite 8 a Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries Client Project ID ARCO, 2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson OC Sample Group 2080298-314 Reported Sep 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method FOA 8020 FPA 8024 FP's 0024 FPA P020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Aug 25, 1992 Aug 25 1992 Aug 25 1992 Aug 25, 1992 <br /> OC Sample # 208-0304 208-0304 208-0304 208-0304 <br /> Sample Conc.. N D N D N D N D <br /> Spike Cone <br /> Added. 020 0 20 020 0 40 <br /> Cone Matrix <br /> Spike 020 0 21 022 041 <br /> Matrix Spike <br /> %Recovery, 100 105 110 102 <br /> Conc. Matrix <br /> Spike Dup. 020 0 21 022 0 41 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 100 105 110 102 <br /> Relative <br /> %Difference: 00 0 0 00 00 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> �Izi t Relative%Difference Conc of M S Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of MSD) /2 <br /> Laboratory Director <br /> 2080298 RES <3> <br />