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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> R>=SNA[n Iustnes Client Project ID Arco#6100,Tracy <br /> 3164 Gold Camp Dr., Suite 200 <br /> Rancho Cordova,CA 95670 <br /> Attention David Stavarek QC Sample Group 2120464-65 A x Reported Dec 16, 1992 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> r Benzene Toluene Ethyl6enzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravallotr ChiaravallcU Chiaravallob Chiaravalloti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Dec 15, 1992 Dec 15, 1992 Dec 15, 1992 Dec 15 1992 <br /> QC Sample# BLK121592 BLK121592 BLK121592 BLK121592 <br /> Sample Cone.: N D N D N D N D <br /> 1 i Spike Conc. <br /> Added: 020 020 020 040 <br /> Cone. Matrix <br /> Spike: 017 018 018 034 <br /> 1 <br /> Matrix Spike <br /> %Recovery: 85 90 90 85 <br /> Cone. Matrix <br /> Spike Dup : 018 018 018 035 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 90 90 90 88 <br /> 1 Relative <br /> % Difference: 57 00 00 29 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 1 <br /> SEQUOIA ANALYTI AL % Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> l/ Relative%Difference Cone of M S -Conc of M S D x 100 <br /> Michael R Giles (Cone of M S + Cone of M S D)/2 <br /> Laboratory Director <br /> 1 2120464A.RES <2> <br />