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(D• 404 N Wlget Lane <br /> Sequoia Walnut Creek, CA 94598 <br /> 4 (925) 988-9600 <br /> Analytical FAX(925) 988-9673 <br /> Ir- <br /> Gettter Ryan,Inc -Dublin Project Unocal <br /> 6'747 Sierra Court Suite 7 Project Number Unocal 4 0187 Reported <br /> Dublm CA,94568 Project Manager Deanna L Harding 09-Mar-00 10 44 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch OB29001-EPA 5030B [P/Tl <br /> Blank(OB29001-BLKI) Prepared&Analyzed 29-Feb-00 <br /> Purgeable Hydrocarbons ND 50 ugll <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tett-butyl ether ND 25 " <br /> Surrogate q q a-Trifluorotoluene 308 300 103 70.130 <br /> LCS(OB29001-BS1) Prepared&Analyzed 29-Feb-00 <br /> Benzene 190 050 ug/l 200 95 0 70-130 <br /> Toluene 19 5 050 200 975 70-130 <br /> Ee 199 050 200 995 70-130 <br /> X (total) 643 050 600 107 70-130 <br /> Surrogate 44a-Th luorotoluene 282 300 940 70-130 <br /> Matrix Spike(OB29001-MSI) Source W002507-01 Prepared&Analyzed 29-Feb-00 <br /> Benzene 191 050 ugn 200 ND 955 70-130 <br /> Toluene 197 050 200 ND 995 70-130 <br /> Ethylbenzene 172 050 200 ND 860 70-130 <br /> Xylenes(total) 63 5 050 600 ND 106 70-130 <br /> Surrogate a,a o-7)'7 luorotoluene 279 300 930 70-130 <br /> Matrix Spike Dup(OB29001-MSD1) Source W002507-01 Prepared&Analyzed 29-Feb-00 <br /> Benzene 185 050 ugn 200 ND 92 5 70-130 319 20 <br /> Toluene 19 3 050 200 ND 965 70-130 2 05 20 <br /> Ethylbenzene 171 050 200 ND 85 5 70-130 0 583 20 <br /> Xylenes(total) 618 050 600 ND 103 70-130 271 20 <br /> Surrogate qq a-Tnjluorotoluetne 266 300 887 70-130 <br /> SIla Analytical -Walnut Creek The results in this report apply to the samples analyzed in accordant, %ith the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 13 of 22 <br />