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I <br /> j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> I <br /> RESNA Industries Client Project ID Arco #2076, Lodi M <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson QC Sample Group 2 1 0050 1-03 Reported Oct 28, 1992 <br /> i , <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/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Oct 27, 1992 Oct 27, 1992 Oct 27, 1992 Oct 27, 1992 <br /> QC Sample # BLK102792 BLK1o2792 BLK102792 BLK102792 <br /> Sample Cone.: N D N D N D N D <br /> i� <br /> Spike Cone. <br /> Added: 020 020 020 040 <br /> Cone. Matrix <br /> Spike: 018 019 019 039 <br /> Matrix Spike <br /> % Recovery- 90 95 95 98 <br /> i Cone. Matrix <br /> Spike Dup 018 019 020 040 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 95 100 100 <br /> Relative <br /> % Difference: 00 00 51 25 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> ,1 Spike Cone Added <br /> ' Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Michael R Giles (Cont of M S + Cont of M S D)/2 <br /> Laboratory Director <br /> 2100501 RES <2> <br />