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aSequoia Walnutae*CA 94 99 <br /> — ) (925)988-9600 <br /> Analytical FAX(916)988-9673 <br /> WWW se uoialabs cam <br /> er Ryan,Inc -Dublin Project Unocal <br /> 7 Sierra Court Suite J Project Number Unocal#I 2859 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 07-Dec-01 08 14 <br /> Total Purgeable Hydrocarbons (C&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 IK20001 -EPA 50308 PIT <br /> Blank(1K20001-BLK1) Prepared&Analyzed 20-Nov-01 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether(MTBE) ND 2 5 " <br /> Surrogate a,a,a-Tri luorotoluene 376 300 125 70-130 <br /> Blank(I K20001-BLK2) Prepared&Analyzed 21-Nov-01 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> E benzene ND 0 50 " <br /> s(total) ND 050 " <br /> Methyl tert-butyl ether(MTBE) ND 2 5 " <br /> Surrogate a,a,a-Trifluorotoluene 377 300 116 70-130 <br /> Blank(1K20001-BLK3) Prepared 21-Nov-01 Analyzed 26-Nov-01 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether(MTBE) ND 2 5 " <br /> Surrogate a,a,a-Tris luorotoluene 411 300 137 70-130 S L1M <br /> LCS(1K20001-BS 1) Prepared&Analyzed 20-Nov-01 <br /> Benzene 221 050 u9/1 200 110 70-130 <br /> Toluene 237 050 200 118 70-130 <br /> Ethylbenzene 228 050 200 114 70-130 <br /> Xylenes(total) 65 8 050 600 Ito 70-130 <br /> Surrogate a,a,a-Trtfluorotoluene 344 300 115 70-130 <br /> is 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 entirety <br /> 12 of 19 <br />