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1551 Road <br /> Sequoia <br /> San Carlosrlos A23 -96 0 <br /> (650)232-9600 <br /> A.J i�uDp nalytical ww equoi232-9612 <br /> www sequoialabs corn <br /> ler-Ryan/Geostrategies(1) Project Tosco(l) <br /> 7 Sierra Court,Suite J Project Number Tosco(Former BP)#1 1192,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/01/02 13 39 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 80271B - 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 2020064-EPA 5030B (PIT <br /> Blank(2020064-BLKI) Prepared&Analyzed 02/20/02 <br /> Purgeable 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 tert-butyl ether ND 50 " <br /> Surrogate a a a-Trifluorotoluene 969 100 969 70-130 <br /> LCS(2020064-BSI) Prepared&Analyzed 02/20/02 <br /> Benzene 880 050 ug/l 100 880 70-130 <br /> Toluene 876 050 100 876 70-130 <br /> Ethylbenzene 883 050 100 883 70-130 <br /> Xylenes(total) 264 050 300 880 70-130 <br /> ate a a a-Trifluorotoluene 105 100 705 70--130 <br /> LCS(2020064-BS2) Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 308 50 ug/1 250 123 70-130 <br /> Surrogate a a a-TriJluorotoluene 106 100 106 70-130 <br /> Matrix Spike(2020064-MS1) Source L202088-03 Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 261 50 ug/l 250 ND 104 60-140 <br /> Surrogate a,a a-Trifluorotoluene 110 100 110 70-130 <br /> Matrix Spike Dup(2020064-MSDI) Source L202088-03 Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 238 50 ug/l 250 ND 952 60-140 922 25 <br /> Surrogate a a a-Triuorotoluene 105 " 100 105 70-130 <br /> is Analytical - San Carlos The results in this repos t apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical)epori must be reproduced in its entirety <br /> Page 11 of 14 <br />