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4 ID Sequoia Walnut�Creek, CA 945988 <br /> (925) 988-9600 <br /> Analytical FAX(925) 988-9673 <br /> iro <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite I Project Number Unocal 4 2859 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 09-Mar-0010 29 <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 Notes <br /> Batch OB24003-EPA 5030B JP/TJ <br /> LCS(OB24003-BSI) Prepared&Analyzed 24-Feb-00 <br /> Benzene 218 050 ugll 200 109 70-130 <br /> Toluene 221 050 200 111 70-130 <br /> Ethylbenzene 222 050 200 111 70-130 <br /> Xylenes(total) 63 4 050 600 106 70-130 <br /> Surrogate aaa-Tri luorotolueue 300 300 100 70-130 <br /> LCS Dup (OB24003-BSD1) Prepared 24-Feb-00 Analyzed 25-Feb-00 <br /> Benzene 225 050 ug/1 200 113 70-130 3 16 20 <br /> Toluene 219 050 200 114 70-130 3 56 20 <br /> Ethylbenzene 231 050 200 116 70-130 397 20 <br /> Xylenes(total) 666 050 600 111 70-130 492 20 <br /> Sto a,aa-Thluorotoluene 301 300 101 70-130 <br /> Balch OB28001 -EPA 5030E [P/TJ <br /> Blank(OB28001-BLK1) Prepared&Analyzed 28-Feb-00 <br /> Purgeable Hydroearbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl ted-butyl ether ND 25 " <br /> Surrogate aaa-Trifluorotoluene 315 300 105 70-130 <br /> LCS(OB28001-BS1) Prepared&Analyzed 28-Feb-00 <br /> Benzene 176 050 u9A 200 880 70-130 <br /> Toluene 180 050 200 900 70-130 <br /> Ethylbertzme 19 8 050 200 99 0 70-130 <br /> Xylenes(total) 583 050 600 972 70-130 <br /> Surrogate aaa-Tre,Jluorotoluene 28.2 300 940 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 Tins analytical report must be reproduced in its entirely <br /> Page 15 of 21 <br />