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Sequoia CA 404 N Lane <br /> Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical www <br /> 988-9673 <br /> sequequoialabs corn <br /> Gettier Ryan,Inc -Dublin Project Tosco <br /> 6747 Sterna Court Suite J Project Number Tosco# 11194 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 14-Aug-01 08 33 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1H06003-EPA 5030B PIT <br /> Blank(1H06003-BLK1) Prepared 06-Aug-01 Analyzed 07-Aug-01 <br /> Purgeable Hydrocarbons 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 25 " <br /> Surrogate a a a-Triuorotoluene 286 300 95 3 70-130 <br /> Blank(1H06003-BLK2) Prepared&Analyzed 07-Aug-01 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> 4zene ND 050 " <br /> ene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Surrogate a,a a-Triuorotoluene 292 300 973 70-130 <br /> LCS(IH06003-BS1) Prepared 06-Aug-01 Analyzed 07-Aug-01 <br /> Benzene 19 9 050 ug/I 200 995 70-130 <br /> Toluene 186 050 200 93 0 70-130 <br /> Ethylbenzene 195 050 200 97 5 70-130 <br /> Xylenes(total) 573 050 600 95 5 70-130 <br /> Surrogate a a a-Trifluorotoluene 279 300 930 70-130 <br /> LCS(lH06003-BS2) Prepared&Analyzed 07-Aug-01 <br /> Benzene 21 0 050 ugh 200 105 70-130 <br /> Toluene 180 050 " 200 900 70-130 <br /> Ethylbenzene 180 050 1. 200 900 70-130 <br /> Xylenes(total) 55 9 050 1. 600 93 2 70-130 <br /> Surrogate a a a-Triuorotoluene 277 1, 300 913 70-130 <br /> uoia Analytical-Walnut Creels 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 4 of 5 <br />