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Gelder-Ryan/Geostrategies(1) Project Tosco(l) <br /> 6747 Sierra Court,Suite 3 P%lett Number Tosco#5886,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/25/01 16 59 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical- San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lmtt units level Result '/*REC Limits RPD limit Notes <br /> Batch 1050083-EPA 5030B(Pn) <br /> Blank(1050083-BLK1) Prepared&Analyzed 05/19/01 <br /> Purgeable Hydrocarbons as Gasoline ND 500 ug/1 <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 " <br /> Ethylbenzene ND 0 500 " <br /> Xylenes(total) ND 0 500 " <br /> Methyl tent-butyl ether ND 500 " <br /> Surrogate aa a-D-fluorotoluene 792 " too 792 70-130 <br /> LCS(1050083-BS1) Prepared&Analyzed 05/19/01 <br /> Benzene 928 0 500 u84 100 928 70-130 <br /> Toluene 921 0 500 100 921 70-I30 <br /> e 910 0 500 " too 910 70-130 <br /> IM"(total) 275 0 500 300 91 7 70-130 <br /> Surrogate a a a-Trifluorotoluene 922 " 100 922 70-130 <br /> LCS(1050083-BS2) Prepared&Analyzed 05/19/01 <br /> Purgeable Hydrocarbons as Gasoline 269 500 ug/1 250 T 108 70-130 <br /> Surrogate a a a-Triuorotoluene 931 too 931 70-130 <br /> Matrix Spike(1050083-MSI) Source L105074-17 Prepared&Analyzed 05/19/01 <br /> Purgeable Hydrocarbons as Gasoline 270 500 ugfl 250 ND 109 60-140 <br /> Surrogate a a a-Trlfluorololuene 8 71 0too 871 70-130 <br /> Matrix Spike Dup(1050083-MSDI) Source L105074-17 Prepared&Analyzed 05/19/01 <br /> Purgeable Hydrocarbons as Gasoline 267 Soo ug/1 250 ND 107 60-140 112 25 <br /> Surrogate a a a-Tnfluorotoluene 899 loo 899 70-130 <br /> nota Analytical-Sail 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 20 of 28 <br />