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885 Jarvis Dr <br /> Sequoia MagaoHi8,CA95037 <br /> (408)776-9600 <br /> a— ) <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.ean <br /> URS Corporation[I] Project: ARCO#2093,Tracy,CA MLL0775 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#2093,Tracy,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vem Elarth 01/10/03 12:48 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120497-EPA 5030E [PIT] <br /> Blank(2120497-BLKI) Prepared&Analyzed: 12/31/02 <br /> Tert-butyl alcohol ND 5.0 ugA <br /> Methyl tent-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Tert-amyl methyl elder ND 0.50 " <br /> Ethanol ND 50 " <br /> Surrogate:1,2-DCA-d4 27.6 15.0 110 60-140 <br /> Laboratory Control Sample(2120497-BS1) Prepared&Analyzed: 12/31/02 <br /> Methyl tert-butyl ether 17.5 0.50 ugn 22.4 78 60-140 <br /> Surrogate;1,2-DCA-d4 27.9 25.0 112 60-140 <br /> Matrix Spike(2120497-MSI) Source:MLL0775-04 Prepared&Analyzed: 12/31/02 <br /> Methyl tert-butyl ether 17.7 0.50 ug/l 22.4 ND 77 60-140 <br /> Surrogate:1,2-DCA-d4 29.9 " 15.0 120 60-140 <br /> Matrix Spike Dup(2120497-MSDI) Source:MLL0775-04 Prepared&Analyzed: 12/31/02 <br /> Methyl tert-butyl ether 20.0 0.50 ug/l 22.4 ND 87 60-140 I2 25 <br /> Surrogate:1,2-DCA-d4 31.4 25.0 126 60-140 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 7 of 8 <br />