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Road <br /> Sequoia an Carlos CA <br /> 4070 <br /> San Carlos 23 -%00 <br /> (650)232-9600 <br /> qW Analytical FAX(650)232-9612 <br /> www sequaalabs COM <br /> Gettler-Ryan/Geostrategtes(1) Project Unocal(4) <br /> 6747 Sierra Court,Suite j Project Number Former Unocal#2859,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/30/021417 <br /> :. <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> _Batch 2050059-EPA 5030B (P/TI <br /> LCS(2050059-BSI) Prepared&Analyzed 05/24/02 - <br /> Benzene 866 050 ug/l 10 0 86 6 70-130 <br /> Toluene 831 050 10 0 831 70-130 <br /> Ethylbenzene 771 050 100 771 70-130 <br /> Xylenes(total) 24 1 050 " 300 80 3 70-130 <br /> Surrogate a a a-Triuorotoluene 101 100 101 70-130 <br /> LCS(2050059-BS2) Prepared&Analyzed 05/24/02 - <br /> Purgeable Hydrocarbons as Gasoline 263 50 ug/l 250 105 70-130 <br /> Surrogate a,a,a-Trifluorotoluene 996 " 100 996 70-130 <br /> Matrix Spike(2050059-MSI) - _ Source L205055-14 Prepared&Analyzed 05/24/02 <br /> Benzene 922 050 ug/l 100 ND 922 60-140 <br /> Toluene 9 00 0 50 100 ND 900 60-140 <br /> Ethylbenzene 8 53 050 " 100 ND 85 3 60-140 <br /> Xylenes(total) 258 0 50 300 ND 860 60-140 . <br /> Surrogate a,a,a-Trifluorololuene 967 100 961 70-130 <br /> Matrix Spike Dup(2050059-MSD1) Source L205055-14 Prepared& Analyzed 05/24/02 <br /> Benzene 989 050 ug/1 100 ND 989 60-140 701 25 <br /> Toluene 944—0 50 10 0 ND 94 460-140 4 77 25— <br /> Ethylbenzene 890 050 10 0 ND 890 60-140 425 25 <br /> Xylenes(total) 266 050 300 ND 887 60-140 305 25 <br /> ---Surrogate-a,a,a-Triuorotol uene--�=_-- —-9 86 — ------ -"—- -100----x=98 6 -- 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 1 7 of 20 <br />