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404 N Wiget Lane <br /> • Walnut Creek,CA 94598 <br /> S e qu o la (925)988'9600 <br /> FAX(925)988-9673 <br /> Analytical www sequoialabscorn <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal#0123 Reported <br /> Dublin CA,9456$ Project Manager Deanna L Harding 20-Jul-00 11 19 <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 Luruts RPD Limit Notes <br /> Batch 0003007-EPA 5030B[P/Tl <br /> LCS(OG03007-BS2) Prepared&Analyzed 30-Jun-00 <br /> IJ-Dichloroethene 250 10 ug/1 200 125 65-135 <br /> Tnchloroethene 160 10 200 800 70-130 <br /> Chlorobenzene 180 10 200 900 70-130 <br /> Surrogate Dibromodiuoromethane 930 100 930 50-150 <br /> Surrogate 4-Bromofluoroberaem 100 " 100 100 50-150 <br /> LCS(0603007-BS3) Prepared&Analyzed 03-Jul-00 <br /> 1,]-Dichloroethene 210 10 ug/I 200 105 65-135 <br /> Trichloroethene 200 10 200 100 70-130 <br /> Chlorobenzene 200 to 200 100 70-130 <br /> Surrogate Dibromodifluoromethane 990 100 990 50-150 <br /> Surrogate 4 Bromofluoroberrzene 11 0 10 D IIO 50-150 <br /> S(0603007-BS4) Prepared&Analyzed 29-Jun-00 <br /> 1,l-Dichloroethene 20 0 1 0 ug/l 20 0 100 65-135 <br /> Trichloroethene 190 10 200 950 70-130 <br /> Chlorobenzene 190 10 200 950 70-130 <br /> Surrogate Dtbromod�fluoromethane 100 100 100 50.150 <br /> Surrogate 4-BromoJluorobeiaene 110 100 110 50-150 <br /> Matrix Spike(0603007-MS1) Source W006591-01 Prepared&Analyzed 03-Jul-00 <br /> IJ-Dichloroethene 200 10 ugll 200 ND 100 60-140 <br /> Tnchloroethene 190 to 200 ND 950 60-140 <br /> Chlorobenzene 190 10 200 ND 950 60-140 <br /> Surrogate Dibromod fluoromethane 910 100 910 50-150 <br /> Surrogate 4-Bromofluorobemene 910 100 910 50-150 <br /> Matrix Spike Dup(0603007-MSD1) Source W006591-01 Prepared&Analyzed 03-Jul-00 <br /> 1,1-Dichloroethene 220 10 ug/l 200 ND Ila 60-140 952 25 <br /> Tnchloroethene 220 10 200 ND 110 60-140 146 25 <br /> Chlorobenzene 210 10 200 ND 105 60-140 100 25 <br /> Surrogate Dibromod!fluoromethane 960 100 96.0 50-150 <br /> Surrogate 4-BromgJluorobePaene 100 100 100 50-150 <br /> 1 <br /> e uola Analytical-Walnut Creek The results in this report apply to the samples anatwed in accordance with the chain of <br /> f custody document This analytical report must be reproduced to its entirety <br /> Page 19 of 20 <br />