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404 NI Wlget Lane <br /> Walnut Geek CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX(925)986-9673 <br /> Analytical www sequolalabscom <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite 3 Project Number Chevron#9-2033 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 04-Sep-01 11 14 <br /> Volatile Organic Compounds by EPA Method 8021B - 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 1H29009-EPA 503013 JP/TJ <br /> Blank(1H29009-BLKI) Prepared&Analyzed 29-Aug-01 <br /> Chloromethane ND 20 agA <br /> Vinyl chloride ND 1 0 " <br /> Bromomethane ND 12 " <br /> Chloroethane ND 10 " <br /> Tnchlorofluoromethane ND 060 " <br /> Freon 113 ND 10 <br /> 1,1-Mchloroethene ND to " <br /> Methylene chloride ND 10 " <br /> trans-1,2-Dichloroethene ND 10 " <br /> l,1-Dichloroethane ND 10 " <br /> cis ^ Dichloroethene ND 10 " <br /> ' oma ND 10 " <br /> 1,1,1-Trichloroethane ND 10 " <br /> Carbon tetrachloride ND 10 " <br /> 1,2-Dichloroethane ND 16 " <br /> Tnchloroethene ND 11 " <br /> 1,2-Dichloropropane ND 10 " <br /> Bromodichloromethane ND 10 " <br /> cis-1,3-Mchloropropene ND 10 " <br /> tams-1,3-Dichloropropene ND 060 " <br /> 1,1,2-Tnchloroethane ND 050 " <br /> Tetmehloroethene ND 060 " <br /> Dibromochloromethane ND 050 " <br /> 1,2-Dibromoethane ND 10 " <br /> Chlorobenzene ND 10 " <br /> Bromofarm ND 050 " <br /> 1,2,3-Trichloropropane ND 050 " <br /> 1,1,2,2 Tetrachloroethane ND 060 " <br /> 1,3-Dichlorobenzene ND 050 " <br /> 1,4-Dichlorobenzene ND 12 " <br /> 1,2-Dichlorobenzene ND 12 " <br /> Surrogate Dibromodifluoromethane 845 100 845 50-150 <br /> Surrogate 4-Bromo luorobenzene 850 100 850 50-150 <br /> $ a Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Ais analytical report must be reproduced in tis entirety <br /> Page 16 of 26 <br />