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Road <br /> Sequoia an Carlos QA l 4070 <br /> (D (650) <br /> 5an Carkos Cq 9407000 <br /> �wAnalytical FAX 23(650)232296961212 <br /> www sequoialabs com <br /> Gettler-Ryan/GeostrategieS(1) Protect Tosco(1) <br /> 6747 Sierra Court, Suite! Project Number Tosco(Former BP)SS#11192 Stockton Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 11/21/01 135:29 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> IAnaiyte Result Limit Units Level Result %REC Limits RPD Limn Notes <br /> Batch 1110075-EPA 5030B IP/TJ <br /> LCS(1110075-BS1) Prepared&Analyzed 11/19/01 <br /> Methyl tert-butyl ether 545 1 0 ug/1 500 109 70-130 <br /> Surrogate 12-Dichloroethane-d4 539 500 108 70-130 <br /> Surrogate Toluene-d8 323 -500 105 70-130 <br /> Matrix Spike(1110075-MSI) Source L1111080-02 Prepared&Analyzed 11/19/01 <br /> Methyl tert-butyl ether 52 9 1 0 ug/l Soo ND 106 60-140 <br /> Surrogate 12-Dichloroethane-d4 533 300 107 70-130 <br /> Surrogate Toluene-d8 520 500 104 70-130 <br /> Matrix Spike Dup(1110075-MSDI) Source L111080-02 Prepared&Analyzed 11/19/01 _ <br /> Methyl tent-butyl ether 552 1 0 ug/l 500 ND,._ 110 60-140 370 25 <br /> Surrogate 1 2-Dichloroethane-d4 533 500 107 70-130 <br /> Surrogate Toluene-d8 522 500 104 70-130 <br /> Sequoia Analytical - San Carlos The results in this reporl apply to the samples onalyred in accordance with the chain <br /> custody document This analytical repoi t must be reproduced in its entirety <br /> Page 18 of 19 <br />