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404 N Wlget Lane <br /> Sequoia Walnut Creek)9 94� <br /> 4 FAX(925) 988-9673 <br /> a- ) Analytical www sequolalabs conn <br /> Gettler Ryan,hie -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco# 11194 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 02-Apr-01 17 54 <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 1C29001 -EPA 5030B P/T <br /> Blank(1C29001-BLK1) Prepared&Analyzed 29-Mar-Ol <br /> Purgeable Hydrocarbons ND 50 ugIl <br /> Benzene ND 0 50 " <br /> Toluene ND 030 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Surrogate aa,a-Tnfluoroioluene 303 300 101 70.130 <br /> LCS(1C29001-BS1) Prepared&Analyzed 29-Mar-Ol <br /> Benzene 180 0 50 ugll 200 900 70-130 <br /> Toluene 188 0 50 200 940 70-130 <br /> Et benzene 195 0 50 200 975 70-130 <br /> s(total) 589 050 600 982 70-130 <br /> Surrogate o a,a-Tnfluorotoluene 287 300 957 70-130 <br /> LCS Dup (IC29001-ESDI) Prepared&Analyzed 29-Mar-Ol <br /> Benzene 192 050 ug/l 200 960 70-130 6 45 20 <br /> Toluene 199 0 50 200 995 70-130 569 20 <br /> Ethylbenzene 200 050 200 100 70-130 2 53 20 <br /> Xylenes(total) 609 0 50 600 102 70-130 334 20 <br /> Surrogate a,a a-Trrfluorotoluene 308 300 103 70-130 <br /> oia Analytical -Walnut Creek The results in this report apply to the samples analyzed in accordance with the chcan of <br /> custody document This analytical report must be reproduced in iib entirety <br /> Page 3 of 4 <br />