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1551 <br /> oad <br /> Sequoia San <br /> 070 <br /> �'--►►�� San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAY eof 32-9612 <br /> labsc m <br /> www seom <br /> Gettler-Ryan/Geostrateg.ies(l) Project Tosco(l) <br /> 6747 Sierra Court Suite I Project Number Tosco(Unocal)SS46981 Stockton,CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 09/27/01 10 19 <br /> Total Purgeable Hydrocarbon (C6-C12) by)CPA 8015M and BTEXIMTBE 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 1090095-EPA 5030B(PIT) - - <br /> Blank 0090095-BLK1) Prepared&Analyzed 09/24/01 <br /> Purgeabie Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl ten-butyl ether ND 50 " <br /> Surrogate a a a-Triuorotoluene 108 100 108 70-130 <br /> LCS(1090095-BSI) Prepared&Analyzed 09/24/0) <br /> Benzene 8 96 0 50 ug/l 100 896 70-130 <br /> Toluene 981 050 100 881 70-130 <br /> Ethylbenzene 911 050 100 91 1 70-130 <br /> Xylenes(total) 271 050 300 903 70-130 <br /> Surrogate aaa-Triuorotoluene 12 7 100 127 70-130 <br /> LCS(1090095-BS2) Prepared&Analyzed 09/24/01 <br /> Purgeable Hydrocarbons as Gasoline 269 50 ugll 250 108 70-130 <br /> Surrogate a a a-Triuorotoluene 118 1, 100 118 70-130 <br /> Matrix Spike(1090095-I♦7S1) Source L109082-12 Prepared&Analyzed 09/24/01 <br /> Benzene 101 050 ug/l 100 ND 101 60-140 <br /> Toluene 988 050 100 ND 988 60-140 <br /> Ethylbenzene 102 050 100 ND 102 60-140 <br /> Xylenes(total) 305 050 300 ND 102 60-140 <br /> Surrogate aa,a-Triuorotoluene 117 100 117 70-130 <br /> Matrix Spike Dup(1090095-MSDI) Source L109082-12 Prepared&Analyzed 09/24/01 <br /> Benzene 11 1 050 ug/l 100 ND 111 60-140 943 25 <br /> Toluene 110 050 100 ND 110 60-140 107 25 <br /> Ethylbenzene 115 050 100 ND ]I S 60-140 120 25 <br /> Xylenes(total) 34 1 050 300 ND 114 60-140 11 1 25 <br /> Surrogate aaa-Triuorotoluene 112 100 112 70-130 <br /> Sequoia Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain Jw <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 14 of 21 <br />