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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 • FAX (916) 921 0100 <br /> I <br /> I <br /> RESNA Industries Client Project ID Arca #2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson CC Sample Group 2110492-97 Reported Dec 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravallotr Chiaravailoti Chtaravalloti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 24 1992 Nov 24 1992 Nov 24, 1992 Nov 24, 1992 <br /> QC Sample # 211-0351 211-0351 211-0351 211-0351 <br /> Sample Conc N D N D N D N D <br /> Spike Conc. <br /> Added: 020 020 020 040 <br /> Conc Matrix <br /> Spike: 016 017 017 034 <br /> Matrix Spike <br /> % Recovery- 80 85 85 85 <br /> Conc Matrix <br /> Spike Dup . 017 018 013 030 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 90 90 93 <br /> Relative <br /> % Difference 61 57 57 85 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sampie x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Conc of M S D X100 <br /> Michael R Giles (Conc of M S + Conc of M S D 1 /2 <br /> Laboratory Director <br /> 2110492 RES <2> <br />