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Road <br /> IndustrialSequoia San Carlos CA 94070 <br /> a— ) 9600 <br /> qow Analytical FAX(650)232(65o232-96129612 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrategtes(1) Project Unocal(4) L2080:29 <br /> 6747 Sierra Court. Suite I Project Number Former Unocal 42859 Stockton Rep <br /> Dublin CA 94568 Project Manager Deanna Harding 08/28/023 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control 4 <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level, Result °/uREC Limits RPD Limit Notes <br /> Batch 2080023 - EPA 5030B PIT <br /> Laboratory Control Sample(2080023-BSI) Prepared&Analyzed 08/22/02 - <br /> Methyl Cert-butyl ether 564 10 ug/I 500 113 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 456 500 912 70-130 <br /> Surrogate Toluene-d8 495 500 990 70-130 <br /> Matrix Spike(2080023-MSI) Source L208029-14 Prepared&Analyzed 08/22/02 <br /> Methyl ten-butyl ether 558 10 ugA 500 ND 112 60-140 a <br /> Surrogate 1,2-Dichloroethane-d4 45 7 500 914 70-130 <br /> Surrogate Toluene-d8 496 300 992 70-130 - <br /> Matrix Spike Du (2080023-A7SD1 Source L208029-14 Prepared&Analyzed 08/22/02 <br /> Methyl tert-butyl ether 535 10 ug/l 500 ND 107 60-140 421 25 <br /> 4 <br /> Surrogate 1 2-Dichloroerhane-d4 447 500 894 70-130 <br /> Surrogate Toluene-d8 488 500 _ 976 70-130 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed to accordance with the chain <br /> custody document Unless orhenv ise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 17 of 25 <br />