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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical wFAX(925)988-9673 <br /> ww sequolalabb coin <br /> Gettler Ryan Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-2033 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 29-Jun-00 16 29 <br /> Volatile Organic Compounds by EPA Method 8010B- 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 OE30010- EPA 5030B jP/T] <br /> LCS(OE30010-BSI) Prepared&Analyzed 30-May-00 <br /> 1 1-Dichloroethene 190 10 ug/1 200 950 65-135 <br /> Trichloroethene 200 1 0 200 100 70-130 <br /> Chlorobenzene 200 10 200 100 70-130 <br /> Surrogate Dibromodifluoromethane 930 100 930 50-150 <br /> Surrogate 4-Bromofluorobenzene 110 100 110 50-150 <br /> LCS (OE30010-BS2) Prepared&Analyzed 31-May-00 <br /> 1,1-Dichloroethene 190 10 ug/l 200 950 65-135 <br /> Trichloroethene 190 10 " 200 950 70-130 <br /> Chlorobenzene 190 10 " 200 950 70-130 <br /> Surrogate Dibromodiuoroinethane 960 " 100 960 50-150 <br /> Surrogate 4-Bromofluorobenzene 11 0 100 110 50-150 <br /> LCS(OE30010-BS4) Prepared&Analyzed 05-Jun-00 <br /> 1,I-DtWoroethene 200 10 ug/1 200 100 65-135 <br /> Trichloroethene 210 10 " 200 105 70-130 <br />—Chloeobenzene 20_0_1_0___"__ 20 0 —100--70-130— <br /> Surrogate <br /> 0070-13Surrogate Dibromodfluoromethane 970 100 970 50-150 <br /> Surrogate 4-Bromofluorobenzene 120 100 120 50-150 <br /> Matrix Spike(OE30010-MS1) Source W005713-03 Prepared&Analyzed 30-May-00 <br /> 1 1-Dtchloroethene 190 10 ug/l 200 ND 950 60-140 <br /> l Trrchlonxthene 200 10 200 ND 100 60-140 <br /> Chlorobenzene 200 10 200 ND 100 60-140 <br /> Surrogate Dibromodifluoromethane 960 " 100 960 50-150 <br /> Surrogate 4-Bromofluorobemene 110 100 110 SO-150 <br /> Matra Spike Dup(OE30010-MSDI) Source W005713-03 Prepared&Analyzed 30-May-00 <br /> 1,1-Dichloroethene 210 10 ug11 200 ND 105 60-140 100 25 <br /> Trichloroethene - 220 10 200 ND 110 60-140 952 25 <br /> Chlorobenzene 210 10 200 ND 105 60-140 488 25 <br /> Surrogate Dibromodifluoromethane 930 100 9-40 50-150 <br /> Surrogate 4-Bromofluorobenaene 11 0 100 110 50-150 <br /> Sequoia Analytical-Walnut Creek The results in tins report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical repoil must be reproduced in its entirety <br /> Page 17 of 21 <br />