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Sequoia /SSIlndusinalRoad <br /> s <br /> San Carlos CA 9407070 <br /> iW Analytical FAX <br /> a— ) (650)232-9600 <br /> (650)232-9612 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrategies(1) Project Unoca](4) ^- <br /> 6747 Sierra Court,Suite J Project Number Former Unocal#2859,Stockton Reported <br /> Dublin CA, 94568 Project Manager Deanna Harding 03/04/02 0141 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RFD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2020077-EPA 5030B [P/TJ <br /> Blank(2020077-BLKI) - - Prepared&Analyzed 02/22/02 <br /> Surrogate Toluene-d8 497 49/1 500 994 70-130 <br /> LCS (2020077-BSI) Prepared&Analyzed 02/22/02 <br /> Methyl tert-butyl ether 442 10 ug/I 500 884 70-130 <br /> Surrogate I 1-Dichloroethane-d4 516 500 103 70-130 <br /> Surrogate Toluene-d8 496 300 992 70-130 <br /> Matrix Spike(2020077-MS1) Source L202098-06 Prepared&Analyzed 02/22/02 <br /> Methyl tert-butyl ether 482 10 ug/1 500 ND 964 60-140 <br /> Surrogate 1,2-Dichloroethane-d4 538 500 108 70-130 <br /> Surrogate Toluene-d8 495 500 990 70-130 - - <br /> Matrix Spike Du (2020077-MSD1) Source L202098-06 Prepared&Analyzed 02/22/02 <br /> Methyl tert-butyl ether 440 10 ug/I 500 ND 880 60-140 _ 9 11 25- <br /> Surrogate <br /> 5-Surrogate 12-Dichloroethane-d4 533 Soo 107 70-130 <br /> Surrogate Toluene-d8 497 500 994 70-130 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety r <br /> Page 17 of 18 <br />