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y SEQUOIA ANALYTICAL- <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> ' (916) 921-9600 9 FAX (916) 921-0100 <br /> RESNA Industries Client Project ID Arco #760, Lodi v <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek OC Sample Group 207-0643 Reported Aug 5, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel oil&Grease Organic Lead <br /> EPA <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod SM 5520E&F LUFT <br /> Analyst C Chapman C Chapman C Chapman C Chapman C Chapman N Valdes S Foster <br /> Reporting Units ppm ppm ppm ppm ppm mg/kg mg/kg <br /> l Date Analyzed Jul 31, 1992 Jul 31, 1992 Jul 31, 1992 Jul 31, 1992 Aug 3, 1992 Aug 4, 1992 Aug 4, 1992 <br /> QC Sample# 207-0494 207-0494 207-0494 207-0494 BLK080392 BLK080392 207-0643 <br /> Sample Cone.: N D N D N D N D N D N D Oil <br /> Spike Cone. <br /> Added: 020 020 020 040 15 325 050 <br /> Cone. Matrix <br /> Spike. 018 019 019 035 12 265 066 <br /> Matrix Spike <br /> % Recovery: 90 95 95 88 80 82 110 <br /> Conc. Matrix <br /> Spike Dup.: 019 020 020 037 14 250 065 <br /> Matrm Spike ` <br /> Duplicate <br /> % Recovery- 95, 100 100 192 93 77 108 <br /> Relative <br /> % Difference- 54 51 51 56 15 54 15 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> �i- Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Laboratory <br /> ory Dlrectar MichaelR Giles (Cone of M S + Cone of M S D)/2 <br /> Laboi <br /> { <br /> c 2470643 RES 4 5> <br /> i <br />