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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> Anal 'cal (408)776-4600 <br /> FAX(406)782-6308 <br /> URS Corporation Project BP Heritage Site 411193,Stockton,CA ML]0264 <br /> 500 I2th Street,Suite 100 Project Number BP Heritage Site#11193,Stockton,CA Reported <br /> Oakland CA,94607 Project Manager Vern Elarth 09/18/02 12 37 <br /> Volatile Orgamc Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Ana:1t o Result Lurut Units Level Result %REC Limits RPD Lurnt Notes <br /> Batch 2113010-EPA 5030B PIT <br /> Laboratory Control Sample 2I13010-BS1 Pre ared&Analyzed 09/13/02 <br /> Methyl tert-butyl ether 10 8 050 ugli 100 108 63-137 <br /> Surrogate 1 2-Drchloroethane-d4 568 500 114 78-129 <br /> Laborator Control Sample Du 2I13010-BSD1 Prepared&Analyzed 09/13/02 <br /> Methyl tert-butyl ether 11 0 0 50 119/1 100 110 63-137 1 83 13 <br /> Surrogate 12-Dichloroethane-d4 561 500 112 78-129 <br /> Batch 2I13029-EPA 5030E PIT <br /> Blank(2113029-BLKI) Prepared&Analyzed 09/13/02 <br /> S <br /> enzene ND 0 50 ug/l <br /> romobenzene ND 050 " <br /> Bromochloromethane ND 050 " <br /> Bromodichloromethane ND 050 " <br /> Bromoform ND 050 " <br /> Bromomethane ND 1 0 " <br /> n-Butylbenzene ND 050 " <br /> sec-Butylbenzene ND 050 " <br /> tert-Butylbenzene ND 050 <br /> Carbon tetrachloride ND 050 <br /> Chlorobenzene ND 050 " <br /> Chloroethane ND 0 50 " <br /> Chloroform ND 050 " <br /> Chloromethane ND 0 50 " <br /> 2-Chlorotoluene ND 0 50 " <br /> 4-Chlorotoluene ND 0 50 " <br /> Dibromochloromethane ND 050 " <br /> 1,2-Dibromoethane ND 050 " <br /> Dibromomethane ND 050 " <br /> 1,2-Dibromo-3-chloropropane ND 1 0 <br /> 1,2-Dichlorobenzene ND 050 " <br /> 1,3-Dichlorobenzene ND 050 <br /> 1,4-Dichlorobenzene ND 050 " <br /> Dichlorodifluoromethane ND 050 n <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report most be reproduced in its entirety <br /> 34 of 39 <br />