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1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> (654)232-9600 <br /> FAX Analytical wwseq 4ialabs om <br /> wtivw sequoiaiabs com <br /> er-Ryan/Geostrategies(1) Project Tosco(1) <br /> Sierra Court, Suite J Project Number Tosco#5886,Stockton,CA Reported <br /> ^Dublin CA,94568 Project Manager Deanna Harding 12/06/01 16 51 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEXIMTBE by EPA 8021B - Quality Control <br /> _Sequoia Analytical_- San Carlos_______ <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120002-EPA 5030B(P/T) <br /> Blank(1120002-BLKI) Prepared&Analyzed 12/03/41 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Surrogate a a,a-TrIJ7uorotoluene 769 Joe 769 70-130 <br /> LCS(1120002-BSI) Prepared&Analyzed 12/03/01 <br /> Benzene 106 0 50 ug/l 100 106 70-130 <br /> Toluene 109 0 50 " 100 109 70-130 <br /> Ethylbenzene 112 050 " 100 112 70-130 <br /> XvirnLs(total) 33 1 0 50 " 300 110 70-130 <br /> Mate aaa-Triuorotoluene 944 Joe 944 70-130 <br /> LCS(1120002-BS2) Prepared&Analyzed 12/03/01 <br /> Purgeable Hydrocarbons as Gasoline 221 50 ug/l 250 884 70-130 <br /> Surrogate a a a-Trifluorotoluene 963 11 70 0 963 70-130 <br /> Matrix Spike(1120002-MSI) Source L111140-111 Prepared 12/03/01 Analyzed 12/04/01 <br /> Benzene 104 050 ug/1 100 ND 104 60-140 <br /> Toluene 948 0 50 100 ND 948 64-140 <br /> Ethylbenzene 910 0 50 100 ND 91 0 60-140 <br /> Xylenes(total) 270 0 50 300 ND 900 60-140 <br /> Surrogate a a a-Trifluorotoluene 93-5 Joe 935 70-130 <br /> Matrix Spike Dup(I 120002-MSDI) Source L111140-11 Prepared 12/03/01 Analyzed 12/04/01 <br /> Benzene 995 0 50 ug/l 100 ND 995 60-140 442 25 <br /> Toluene 9 08 050 100 ND 908 60-140 4 31 25 <br /> Ethylbenzene 976 050 100 ND 876 60-140 3 81 25 <br /> Xylenes(total) 259 050 300 ND 863 60-140 4 16 25 <br /> Surrogate a aa-Trifluorololuene 934 Joe 934 70-130 <br /> 1a Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 16 of 23 <br />