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Sequoia San CanCarlarlds Road <br /> os 23 94070 <br /> � Analytical 29600 <br /> FAX(650)232-9612 <br /> www seqequoiauo+akabs tom <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Tosco#4409,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/03/021 i0 <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 2040093-EPA 5030B (PIT) <br /> Blank (2040093-BLKI) Prepared&Analyzed 04/30/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ugA <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 " <br /> Methyl tett-butyl ether ND 50 " <br /> Surrogate a a a-Tr+i luorotoluene 907 100 90 7 70-130 <br /> LCS(2040093-BS1) Prepared&Analyzed 04/30/02 <br /> Benzene 854 0 50 ugA 100 85 4 70-130 <br /> Toluene 836 050 100 83 6 70-130 <br /> Ethylbenzene 867 0 50 100 867 70-130 <br /> Xylenes(total) 25 7 0 50 300 857 70 130 <br /> Surrogate a a a-Trtuorotoluene 902 100 902 70-130 <br /> LCS(2040093-BS2) Prepared&Analyzed 04/30/02 <br /> Purgeable Hydrocarbons as Gasoline 262 50 ug/l 250 105 70-130 <br /> Surrogate a,a a-Triuorotoluene 930 11100 93 0 70-130 <br /> Matrix Spike(2040093-MS1) Source L204085-08 Prepared&Analyzed 04/30/02 <br /> Purgeable Hydrocarbons as Gasoline 245 50 ug/1 250 ND 980 60-140 <br /> Surrogate a,a a-Tris luorololuene 920 " 100 92 0 70-130 <br /> Matrix Spike Dup(2040093-MSDI) Source L20408_5-08 Prepared 04/30/02 Analyzed 05/01/02 <br /> Purgeable Hydrocarbons as Gasoline 261 50 ug/l 250 ND 104 60-140 632 25 <br /> Surrogate a a a-Tr+i luorotoluene 913 100 92 3 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 in its entirety <br /> Page 12 of 16 <br />