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i <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> ' (916) 921 9600 • FAX (916) 921 0100 <br /> f / <br /> Brown & Caldwell Client Project ID Arco #434, Lodi <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Tan QC Sample Group 2120471-72 Reported Dec 17, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units mg/m3 mg/m3 mg/m3 mg/m3 <br /> Date Analyzed Dec 15, 1992 Dec 15, 1992 Dec 15, 1992 Dec 15, 1992 <br /> OC Sample # BLK121592 BLK121592 BLK121592 BLK121592 <br /> Sample Conc : N D N D N D N D <br /> Spike Conc. <br /> Added: 20 20 20 40 <br /> Conc.Matrix <br /> Spike: 16 17 17 37 <br /> Matrix Spike <br /> %Recovery: 80 85 85 92 <br /> Conc. Matrix <br /> Spike Dup.: 16 16 16 35 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 80 80 80 88 <br /> Relative <br /> • Ditterence: 0 61 61 56 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 11175 <br /> ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> �� Spike Cone Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M 5 D)/2 <br /> Laboratory Director <br /> 2120471 ORS <2> <br />