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404 N Wlget Lane <br /> reek CA 9598 <br /> Sequoia Walnut (925)988-49600 <br /> FAX(925)988-9673 <br /> Analytical www °'a' `°m <br /> 'UFttler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Sulte J Project Number Unocal x'10187 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 22-Jun-00 07 41 <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 Nates <br /> Batch OF20001 -EPA 5030B [PIT] <br /> Blank(OF20001-BLK1) Prepared&Analyzed 20-Jun-00 <br /> Purgeable Hydrocarbons ND 50 ug/1 ` <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylberimne ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent butyl ether ND 25 " <br /> Surrogate aria-TnJluorotoluerx 316 300 109 70.130 <br /> LCS(OF20001-BS1) Prepared&Analyzed 20-Jun-00 <br /> Benzene 161 050 ug/1 200 805 70-130 <br /> Toluene 179 050 200 895 70-130 <br /> *Ethlbenzene 198 050 200 990 70-130 <br /> (total) 588 050 600 980 70-130 <br /> Surrogate a a a-Tr7 luorotoluene 260 300 867 70-130 <br /> Matrix Spike(OF20001-MS1) Source W006225-11 Prepared&Analyzed 20-Jun-00 <br /> Benzene 149 050 ug/1 200 ND 745 70-130 <br /> Toluene 157 050 200 ND 785 70-130 <br /> Ethylbenzene 182 050 200 ND 91 0 70-130 <br /> Xylenes(total) 545 050 600 ND 908 70-130 <br /> Surrogate Aa a-Trt luororoluene 270 300 900 70-130 <br /> Matrix Spike Dup (OF20001-MSDI) Source W006225-11 Prepared&Analyzed 20-Jun-00 <br /> Benzene 156 050 ug/I 200 ND 780 70-130 459 20 <br /> Toluene 166 G50 200 ND 83 0 70-130 557 20 <br /> Ethylbenzene 199 050 200 ND 99 5 70-130 892 20 <br /> Xylenes(total) 557 050 600 ND 928 70-130 2 18 20 <br /> Surrogate a ao-Tnfluorotoluene 262 300 873 70-130 <br /> oia Analytical-Walnut Creek The results in this report apply to the samples analyaed in accordance with the chatty of <br /> custody document This analytical report must be reproduced in its entrrety <br /> Page 10 of 12 <br />