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885 larvis Drive <br /> / Morgan Hill.CA 95037 <br /> Sequoia _' (408)7769600 <br /> FAX(408)782-63M <br /> Analytical www.sequolalabs.com <br /> 41W <br /> URS Corporation[11 Project: ARCO#434 ML10617 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO4434 Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 11/19/02 05:43 <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 2100345-EPA 5030B [P/'ri <br /> Blank(2100345-BLKI) Prepared&Analyzed: 10/23/02 <br /> 1,2-Dichlormthane ND 0.50 mg/kg <br /> Tert-butyl alcohol ND 0.050 " <br /> Methyl tert-butyl ether ND 0.0050 " <br /> Di-isopropyl ether ND 0.0050 " <br /> Ethyl ten-butyl ether ND 0.0050 " <br /> Tert-amyl methyl ether ND 0.0050 " <br /> Ethanol ND 0.20 " <br /> Surrogate:1,2-DCA44 0.0439 0.0500 88 60-140 <br /> Laboratory Control Sample(2100345-BSI) Prepared&Analyzed: 10/23/02 _ <br /> Methyl tert-butyl ether 0.0475 0.0050 mgtkg 0.0500 95 60-140 <br /> Surrogate:1,2-DCA-d4 0.0441 0.0500 88 60-140 <br /> Matrix Spike(2100345-MS1) Source:5210439-01 _Prepared: 10/23/02 Analyzed: 10/24/02_ _ <br /> Methyl tert-butyl ether 0.0491 0.0050 mg/kg 0.0500 ND 98 60-140 <br /> Surrogate: 1,1-DCA-d4 0.0466 0.0500 93 60-140 <br /> Matrix Spike Dup(2100345-MSD1) Source:S210439-01 Prepared: 10/23/02 Analyzed: 10/24/02 <br /> Methyl tert-butyl ether 0.0496 0.0050 mgtkg 0.0500 ND 99 60-140 1 25 <br /> Surrogate.:1,2-DCA-d4 0.0471 0.0500 94 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. This analytical report most be reproduced in its entirety. <br /> 11 of 12 <br />