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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,)9 95834 <br /> 9600 <br /> "[�`*%w�+�"-"']' (416)921-9600 <br /> ,W Analytical ww.seqFAX 6)labs.c92 00 <br /> wwwsequoialabs.com <br /> URS-Sac,Gateway Oaks Project: ARCO 760,Lodi,CA <br /> 2870 Gateway Oaks Dr.,Ste.300 Project Number: 760,Lodi,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vernon Elarth 08/27/02 15:59 <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 2080223-EPA 5030B[P/TJ <br /> Matrix Spike(2080223-MSI) Source:5208269-03 Prepared&Analyzed:08/22/02 <br /> Methyl tert-butyl ether 0.0412 0.0050 mg/kg 0.0436 ND 94 60-140 <br /> Surrogate:1,2-DCA-d4 0.0440 11 0.0500 88 60-140 <br /> Matrix Spike Dup(2080223-MSDI) Source:S208269-03 Prepared&Analyzed:08/22/02 <br /> Methyl tert-butyl ether 0.0408 0.0050 mg/kg 0.0436 ND 94 60-140 1 25 <br /> Surrogate:1,2-DCA-d4 0.0463 0.0500 93 60-140 <br /> Batch 2080229-EPA 5030B[P/TJ <br /> Blank(2080229-BLKI) Prepared&Analyzed:08/23/02 <br /> Tert-butyl alcohol ND 0.050 mg/kg <br /> Methyl tent-butyl ether ND 0.0050 ' <br /> Di-isopropyl ether ND 0.0050 " <br /> Ethyl tert-butyl ether ND 0.0050 " <br /> Tert-amyl methyl ether ND 0.0050 <br /> Ethanol ND 0.20 " <br /> Surrogate:1,2-DCA-d4 0.0468 0.0500 94 60-140 <br /> LCS(2080229-BSI) Prepared&Analyzed:08/23/02 <br /> Methyl tert-butyl ether 0.0409 0.0050 mg/kg 0.0436 94 60-140 <br /> Surrogate:1,2-DCA-d4 0.0449 11 0.0500 90 60-140 <br /> Matrix Spike(2080229-MS1) Source:S208270-07 Prepared&Analyzed:08/23/02 <br /> Methyl tert-butyl ether 0.0407 0.0050 mg/kg 0.0436 ND 93 60-140 <br /> Surrogate:1,2-DCA-d4 0.0442 11 0.0500 88 60-140 <br /> Matrix Spike Dup(2080229-MSDI) Source:5208270-07 Prepared&Analyzed:08/23/02 <br /> Methyl tert-butyl ether 0.0406 0.0050 mg/kg 0.0436 ND 93 60-140 0.2 25 <br /> Surrogate:1,2-DCA-d4 0.0437 0.0500 87 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain o.J <br /> custody document.This analytical report must be reproduced in its entirety. <br /> Page Page 13 of 14 ' <br />