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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RE'-p—ol-m-5NA lndustnes Client Project ID Arco #6100, Tracy <br /> 31B,,r•46A Gold Camp Dr, Suite 200 <br /> Rar..,%ynigho Cordova, CA 95670 <br /> Atter"itn8(1tion David Stavarek CC Sample Group 2120464-65 Reported Dec 15, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> N pLYTE <br /> Benzene Toluene Ethyibenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> pe.�leFor ting Units mg/kg mg/kg mg/kg mg/kg <br /> G,w [ Ste Analyzed Dec 15 1992 Dec 15, 1992 Dec 15, 1992 Dec 15, 1992 <br /> OC Sample # BLK121592 BLK121592 BLK121592 BLK121592 <br /> Sa,clUfpie Conc N D N D N D N D <br /> 7;mpike Conc. <br /> Added: 020 020 020 040 <br /> C, ..lydnc. Matrix <br /> Spike: 017 018 018 034 <br /> ,V.oW@tiuc Spike <br /> ,A .4% #iecovery: 85 90 90 85 <br /> C,.,=ppc. Matrix <br /> g,.-joolke Dup • 018 018 018 035 <br /> ,, a*fi@1rix Spike <br /> duplicate <br /> t.% piecovery: 90 90 90 88 <br /> flelative <br /> o,4 fl%j)itlerence• 57 00 00 29 <br /> ...,„�llty Assurance Statement All standard operating procedures and quality control requirements have been met <br /> I UOIA ANALYTICAL %Recovery Cone of M S •Cone of Sample x 100 <br /> ISpike Conc Added <br /> V <br /> Relative 96 Difference Conc of M S -Conc of M S D x 100 <br /> mr+pttchaei R Giles (Cont of M S + Conc of M S D)/2 <br /> `gyratory Director <br /> 14 <br /> 2120454 RES <2> <br />