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444 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9G00 <br /> FAX(925)988-%73 <br /> Analytical www sequoialabs com <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-8264 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 29-Dec-00 08 15 <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 OL19005- EPA 5030B [PIT] <br /> Blank(oL19005-BLKI) Prepared 18-Dec-00 Analyzed 19-Dec-00 <br /> Chloromethane ND 20 ug/l <br /> Vmyl chlonde ND 10 " <br /> Bromomethane ND 20 <br /> Chloroethane ND 10 " <br /> Trichlorofluoromethane ND l0 " <br /> Freon 113 ND 10 " <br /> 1,1-Dichloroethene ND 10 " <br /> Methylene chloride ND 10 " <br /> trans-l,2-Dichloroethene ND 10 " <br /> 1,1-Dichloroethane ND 10 <br /> cis 1,2-Dichloroethene ND 10 " <br /> Chloroform ND 10 <br /> 1,1,1-Trichloroethane ND 10 " <br /> Carbon tetrachlonde ND 10 " <br /> 1,2-Dichloroethane ND 20 " <br /> 'hichloroethene ND 20 " <br /> 1,2-Dichloropropane ND 10 " <br /> Bromodichloromethane ND 10 " <br /> cis-1,3-Dichloropropene ND 10 " <br /> trans-1,3-Dichloropropene ND 10 " <br /> 1,1,2-Tnchloroethane ND 050 " <br /> Tetrachloroethene ND 10 " <br /> Dibromochloromethane ND 050 " <br /> 1,2-Dibromoethane ND 10 " <br /> Chlorobenzene ND 10 " <br /> Bromoforrn ND 050 " <br /> 1,2,3-Tnchloropropane ND 050 " <br /> 1,1,2,2-Talrachloroethane ND 10 " <br /> 1,3-Dichlorobenzene ND 050 " <br /> 1,4-Dichlorobenzene ND 20 " <br /> 1,2-Dichlorobenzene ND 20 " <br /> Surrogate Dibromodiuoromethane 810 100 810 50.150 <br /> Surrogate 4-Biomofluorobeiaene 730 100 730 50-150 <br /> Sequoia Analytical -Walnut Creek The results in das report apply to the smnples analyzed in accordance with the churn a <br /> custody document This analytical report must be reproduced in its entire <br /> Page 12 of 22 <br />