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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> 5}" r tt'i^•rr w.r+ n ,.n vv ptv+tvn of r v n ` rN K r4 <br /> RESNA Industries n k µM N Client Project ID Arco#2168, Stockton <br /> ;3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Cherven OC Sample Group 2040705-13 Reported May 13, 1992 <br /> t <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> I <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed May 6, 1892 May 6, 1992 May 6, 1992 May 6, 1992 <br /> I OC Sample# 205-0025 205.0025 208-0025 205-0025 <br /> Sample Conc.: N D N D N D N D <br /> Spike Conc. <br />` Added: 02 02 02 04 <br /> Conc. Matrix <br /> Spike: 017 017 018 036 <br /> Matrix Spike <br /> %Recovery- 85 85 90 90 <br /> Conc. Matrix <br /> l Spike Dup.- 018 018 019 038 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 90 90 95 95 <br /> l Relative <br /> %Difference: 57 57 54 54 <br /> Ouality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> l SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample _ x 100 <br /> Spike Conc Added <br /> (J Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> l 2040705 RES <I 0 a <br />