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Sequoia 1551 nal Road <br /> 41) <br /> San CarlosrlvS CA 94070 <br /> Analytical (650)232 9600 <br /> FAX(650)232-9612_ <br /> www sequoialabs com i <br /> Gettler-Ryan/Geostrategics(I) Project Tosco(1) <br /> 6747 Sierra Court, Suite J Project Number Tosca##01205 (Circle K), Lathrop,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/14/02 12 09 <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 2020020- EPA 5030B (P/T) <br /> Blank(2020020-BLK1) Prepared&Analyzed 02/06/02 <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-Ti rfluoiotoluene 112 100 112 70-130 <br /> LCS(2020020-BSI) Prepared& Analyzed 02/06/02 <br /> Benzene 11 3 050 ug/l 10 0 113 70-130 <br /> Toluene 11 3 050 10 0 113 70-130 <br /> Ethylbenzene 114 050 10 0 114 70-130 <br /> Xylenes(total) 342 050 30 0 114 70-130 <br /> Surrogate a a a-TrOuorotoluene 105 100 105 70-130 <br /> LCS(2020020-BS2) Prepared& Analyzed 02/06/02 <br /> Purgeable Hydrocarbons as Gasoline 236 50 ug/1 250 94 4 70-130 <br /> Surrogate aaa-Triuorotoluene 104 11100 104 70-130 <br /> Matrix Spike(2020020-MSI) Source L201108-03 Prepared& Analyzed 02/06/02 _ <br /> Benzene 872 050 ug/l 100 ND 87 2 60-140 -- <br /> Toluene 873 0 50 100 ND 87 3 60-140 <br /> Ethylbenzene 869 050 100 ND 86 9 60-140 <br /> Xylenes(total) 262 0 50 300 ND 87 3 60-140 <br /> Surrogate a a a-Tris luorotoluene 996 100 996 70-130 <br /> Matrix Spike Dup(2020020-MSDI) Source L201108-03 Prepared& Analyzed 02/06/02 <br /> Benzene 920 050 ug/I 10 0 ND 920 60-140 5 36 25 <br /> Toluene 9 15 050 100 ND 91 5 60-140 470 25 <br /> Ethylbenzene 907 050 10 0 ND 907 60-140 428 25 <br /> Xylenes(total) 276 0 50 300 ND 920 60-140 5 20 25 <br /> Surrogate a s a-Tri/luorololuene 963 1019 96 3 70-130 <br /> Sequoia Analytical - San Carlos The i esults in this i epos t apply to the samples analyzed in accordance with the chain <br /> custody document This analytical i eport must be reproduced in its entirery <br /> i <br /> Page 9 of 11 <br />