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f <br /> 4DFAX404 N Wlget lane <br /> Sequoia Walnut Creek,CA 94598 <br /> 4 (925)988-9600 <br /> � Analytical w <br /> (925)48&9673 <br /> www sequoiala6s coin <br /> r <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal#0123 Reported <br /> Dublin CA,94568 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 Litnits RPD Limit Notes <br /> Batch 0G03007-EPA 5030B [Pfr] <br /> Blank(OG03007-BLK2) Prepared&Analyzed 30-Jun-00 <br /> Chloromethane ND 20 ug/1 <br /> Vuiyl chlonde ND 10 <br /> Brornometl=e ND 10 " <br /> Chloroethane ND 10 " <br /> Trichlorofluoromethane ND 050 " <br /> Freon t 13 ND 10 " <br /> 1,1-Dichloroethene ND 10 _ <br /> Methylene chlonde ND 10 " <br /> trans-1,2-Dichloroethene ND 10 " <br /> IJ-Dichloroethane ND 10 " <br /> cis-1,2-Dichloroethene ND 10 <br /> Chloroform ND 10 <br /> 111-Tnchloroethane ND l0 <br /> Carbon tetrachloride ND 10 <br /> 1,2-Dichloroethane ND 20 <br /> Trichloroethene ND 10 " <br /> 1,2-Dichlarop_mpane ND 1 0--- "- --- - -- _9-- -- <br /> Bromodichloromethane ND-1 0 <br /> —cis-1,3-Dtchloropropene ND -,-1 0--" - - <br /> trans-l,3-Dichloropropene ND 050 " <br /> 1,1,2-Tnchloroethane' `- - - __- �� �-- - ND- 0 50 - -- <br /> Teltwhioroethene ND 10 " <br /> DibromooMoromethane ND 050 " <br /> 1,2-Dibromoethane ND to " <br /> Chlorobenzene ND 10 " <br /> Bromoform ND 050 " <br /> 1,2,3-Trichloropropane ND 050 " <br /> 1,1,2,2-Tetrachloroethane ND 050 " <br /> 1,3-Dichlorobenzene ND 050 " <br /> 1,4-Dichlorobenzene ND 10 " <br /> 1,2-Dichlorobenzene ND 20 " <br /> Surrogate .Dibromodifluoromethane 950 100 95 0 SO-150 <br /> Surrogate 4-Bromojluorobemene 890 100 890 SO-150 <br /> 4 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the than of <br /> custody document Tks analytical report must be reproduced in its entirety• <br /> Page 16 of 20 <br />