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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> FAX(925)988-9673 <br /> a- Analytical www sequolalabs corn <br /> ttler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite j Project Number Tosco 4 11192 Reported <br /> Dublin CA,94568 Prosect Manager Doug Lee 21-Dec-00 09 57 <br /> Total Purgeable Hydrocarbons (C6-C12) and BTEX by DHS LUFT- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> .Analyte Result Linut Units Level Result %REC Limits RPD Lunit Notes <br /> Batch OL15002-EPA 5030B [PITT <br /> Blank(OL15002-BLKl) Prepared&Analyzed 15-Dec-00 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a,a a-Tnfluoroioluene 310 300 103 70-130 <br /> LCS(OL15002-BSI) Prepared&Analyzed 15-Dec-00 <br /> Benzene 180 050 ug/l 200 900 70-130 <br /> Toluene 180 050 200 900 70-130 <br /> Ethylbenzene 179 0 50 200 895 70-130 <br /> Xylenes(total) 536 050 600 893 70-130 <br />{ gate qaa-Tnifluorotoluene 270 300 900 70-130 <br /> atnx Spike(OL15002-MSI) Source W012197-03 Prepared&Analyzed 15-Dec-00 <br /> Benzene 177 0 50 ug4 200 ND 885 70-130 <br /> Toluene 176 0 50 200 ND 88 0 70-130 <br /> Ethylbenzene 174 0 50 200 ND 870 70-130 <br /> Xylenes(total) 520 050 600 ND 867 70-130 <br /> Surrogate A a;a-Trrlluororoluene 279 300 930 70130 <br /> Matrix Spike Dup (OL15002-MSD1) Source W012197-03 Prepared&Analyzed 15-Dec-00 <br /> Benzene 183 050 ugh 200 ND 915 70-130 333 20 <br /> Toluene 184 0 50 200 ND 920 70-130 444 20 <br /> Ethylbenzene 182 0 50 20 0 ND 91 0 70-130 449 20 <br /> Xylenes(total) 537 0 50 600 ND 895 70-130 322 20 <br /> Surrogate a,a a-Tri luorotoluene 296 300 98 7 70-130 <br /> Sequoia Analytical-Walnut Creek 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 enttrety10 <br /> Page 4of6 <br />