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SEQUOIA ANALYTICAL <br /> . 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> i � (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industnes Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Drive Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick CC Sample Group 1120585-90 Reported Jan 3, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> I ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8820 EPA 8020 EPA 8020 EPA 8020 <br /> Anaiyst K Ndl K Nill K Ndl K Nili <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Dec 31, 1992 Dec 31 1992 Dec 31, 1992 Dec 31, 1992 <br /> OC Sample# Matnx Blank Matrix Blank Matrix Blank Matnx Blank <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> Added: 04 04 04 12 <br /> Cone. Matrix <br /> Spike: 039 039 042 1 3 <br /> Matrix Spike <br /> % Recovery- 98 98 105 108 <br /> Cone.Matrix <br /> Spike Dup.: 04 04 045 13 <br /> Matrix Spike <br /> Duplicate <br /> I %Recovery: 100 100 112 108 <br /> Relative <br /> %Difference: 25 25 fi g 00 <br /> i <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x too <br /> J , , -- Spike Cone Added <br /> Relative%Oitference Cone of M S -Cone of MSD x 100 <br /> l Michael R Gres Icon of M S + Cone of M S 0) /2 <br /> Laboratory Director 1120583 RES <5a <br />