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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 e Sacramento, CA 95834 <br /> (916) 921-9600 - FAX (916) 921-0100 <br /> hESNA Industries Client Prolect ID Arco#2168, Stockton ~!~ f}}~ <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Cherven CC Sample Group 2050268-70 Reported May 26, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Od&Grease Diesel 1,1-Dichloroethens <br /> I <br /> EPA <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 413 2 8015 Mod EPA 8010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman Chiaravallotr Chiaravailoti M Nguyen <br /> Reporting Units ppb ppb ppb ppb ppm ppb Ng/L <br /> Date Analyzed May 20, 1992 May 20, 1992 May 20, 1992 May 20, 1992 May 21, 1992 May 19, 1992 May 13, 1992 <br /> OC Sample# 205-0295 205-0295 205-0295 205-0295 BLK052192 BLK051892 BLK051392 <br /> MS/MSD <br /> Sample Conc. N D N D N D N D N D N D N D <br /> Spike Conc. <br /> Added 10 10 10 20 5 600 10 <br /> Conc Matrix <br /> Spike. 77 81 80 16 52 510 93 <br /> Matrix Spike <br /> %Recovery: 77 81 80 80 104 85 93 <br /> Conc Matrix <br /> Spike Dup.: 80 85 82 17 51 500 89 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 80 85 82 85 102 83 89 <br /> Relative <br /> % Difference 38 48 25 61 1 9 20 44 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> J <br /> EQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample X100 <br /> A&U� <br /> Spike Conc Added <br /> 7Relative%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 /> 2050268 RES <7> <br />