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Gettler-Ryan/Geostrategies(I) Project. Unocal(4) <br /> 6747 Sierra Court,Suite J Project Number Former Unocal SS#0123 Repot <br /> Dublin CA,94568 Project Manager Deanna Harding 04/04/01 13 15 <br /> Volatile Organic Compounds by EPA Method 8010B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> cyte Result Limit Units level Result %REC Limits RPD Limit Nota <br /> Batch 1D02011-EPA 5030B JP/TJ <br /> LCS(lD02011-BSI) Prepared&Analyzed 04/02/01 <br /> IJ-Dichloroethene 202 10 ug/l 200 101 65-135 <br /> Tnchloroetbene ]as 1 1 " 200 940 70-130 <br /> Chlorobenzene 177 10 200 88 5 70-130 <br /> Surrogate Dlbromodiuoraomethane 128 100 128 50-150 <br /> Surrogate 4-BromoJluorobenzene 110 100 120 50-150 <br /> Matrix Spike(1D0201I-MSI) Source L103137-03 Prepared&Analyzed 04/02/01 <br /> IJ-Diehloroethene 221 10 ug/l 200 ND 111 60-140 <br /> Trichloroethene 217 1 l 200 ND 109 60-140 <br /> Chlorobenzene 201 10 200 ND 101 60-140 <br /> Surrogate Dibromodlfluoromethane 127 100 127 SO-150 . <br /> Surrogate 4 Bromofluorobenzene 130 " 100 130 50-150 <br /> Matrix Spike Du (11302411-MSDI) Source L103137-03 Prepared 04/02/01 Analyzed 04/04/01 <br /> 1,1-Mchlotoethene 202 10 u911 200 ND 101 60-140 898 25 <br />'Trichloroethene —197 1 1 20 0 ND 98 5____60;1409 66 25 <br />—Chlorobcnzcne —179-10 20 0 ND 89 0_60-140 121 25 <br />—Surrogate Dtbromodifluoro eethane 11 7 "— 10 0 —117-50-150 — <br /> Surrogate 4-Bromofluorobemene 107 100 107 50-150 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain o <br /> custody document Thu analytical report must be reproduced to its entirety <br /> Page 26 of 27 <br />