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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921.9600 • FAX (916) 921.0100 <br /> RESNA industries Client Project 1pc Arca.#2130,Stockton <br /> ;3164 Gold Camp Drive,Suite 200 <br /> $.'Rancho Cordova,CA 956, <br /> Attention Eloise Frick QC Sample Group: 1120436-44 <br /> Reported ❑ec 26 1991 - <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Tric+ene Benzene Xylenes Lead f <br /> Method: EPA 2020 EPA 8020 EPA 8020 EPA 6020 EPA 6010 <br /> Analyst: C.Chapman C.Chapman C.Chapman C.Chapman S.Foster i <br /> Repotting Units: ppm PPM ppm Ppm mg/k9 i <br /> ¢� Date Analyzed: Dee 19. 1941 Dec 19, 1991 Dec 19, 1991 Dec 19, 1991 Dec 26, 1991 f <br /> QC Sample#: BLK121991 BLK121991 SLK121991 aLK121991 112-0468 6 <br /> . z <br /> - i <br /> i <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> s <br /> t <br /> Spike Conc. S <br /> Added: 0.2 0.2 0.2 0.4 50 <br /> y: l <br /> Conc.Alairix o- <br /> y' Spike: 0.18 0.19 0.19 0.39 43 <br /> f Matrix Spike <br /> %Reccvery: 90 95 95 98 86 <br /> F <br /> 4 ' <br /> Cane.Matrix <br /> Spike pup.: 0.19 0.2 0.2 0.42 42 <br /> Matrix Spike ; <br /> Duplicate <br /> %Recovery: 95 100 100 110 84 <br /> Relative <br /> — ---°.b DiYerence:-------g.-4--- -------5.1 -----5.3 7.4 "--2.4 ------ --------- ----�— — ---- — <br /> b <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.o!Sample x tpq <br /> Spike Cane Added <br /> Refative a Difference: Conc.of M.S.-Cone, M.S.D. x 100 <br /> Michael R.Giles ICoAc.of M.S.+Conc.of M.S.D.)/2 <br /> illLaboratory0irector 7120438.RES c4> <br />