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404 N Wiget Lane <br /> Walnut Creek CA 94598 <br /> Sequoia (925)988-9600 <br /> IDFAX(925)988-%73 <br /> 07% Analytical www sequolalabs coin <br /> Gettler Ryan,Inc -Dublin Project Tosco MW <br /> 6747 Sierra Court Suite J Project Number Tosco# 11193 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 30-Jun-00 13 59 <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 Leel Result %REC Limits RPD Limit Notes <br /> Batch OF23003-EPA 5030B [PIT] <br /> Blank(OF23003-BLK1) Prepared&Analyzed 23-Jun-00 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 25 " <br /> Surrogate a a a-Tri luorotoluene 297 300 990 70.130 <br /> LCS(OF23003-BS1) Prepared&Analyzed 23-Jun-00 <br /> Benzene 194 0 50 ugJl 20 0 970 70-130 <br /> Toluene 196 050 200 980 70-130 <br /> Ethylbenzene 197 0 50 200 - 985 70-130 <br /> Xylenes(total) 569 0 50 600 948 70-130 <br /> Surrogate a q a-Tr7fluorololuene 2&4 300 947 70.130 <br /> Matrix Spike(OF23003-MS1) Source W006281-01 Prepared&Analyzed 23-Jun-00 <br />—Benzene 195 0 50 ug/1 200 ND 975 70-130 <br /> Toluene - T 196- 050 —20 0- �-ND 980 70-130 - <br /> Ethylbenzene 198 0 50 200 ND 990 70-130 <br /> Xylenes(total) 573 W 0 50 600 ND 95 5 70-130 <br /> Surrogate a a a-Trtfluorotoluene 283 300 943 70.130 <br /> Matrix Spike Dup(OF23003-MSDI) Source W006281-01 Prepared&Analyzed 23-Jun-00 <br /> Benzene 19 6 0 50 ug/l 200 ND 980 70-130 0 512 20 <br /> Toluene 19 8 050 200 ND 990 70-130 102 20 <br /> Ethylbenzene 200 0 50 200 ND 100 70-130 101 20 <br /> Xylenes(total) 577 0 50 600 ND 962 70-130 0 696 20 <br /> Surrogate a,as a-Trifluorotoluene 284 300 947 70.130 <br /> Sequoia Analytical-Walnut Creek L The results to this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced to its entire <br /> Page 5 of 8 <br />