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t <br /> i <br /> {I 819 Striker Avenue,Suite 8 <br /> Sequoia: <br /> Sacramento,CA 95834 <br /> a (916)921-9690 <br /> Analytical <br /> i J FAX(916)921-0100 <br /> www.sequoialabs.coI <br /> Delta Environmental Consultants(Cameron Park) Project: Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number, N/A Reported: <br /> Cameron Park CA,95682 Project Manager. ray Johnson 09/20/01 11:31 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B- Quality Control 1 <br /> Sequoia Analytical-San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes i <br /> Batch 1090053-EPA 5030B {P/Tl <br /> Blank(1090053-BLKI) Prepared&Analyzed:09/14/01 <br /> Ethanol ND 50 mg/kg <br /> 1,2-Dibromoethane ND 0.10 " <br /> 1,2-Dichloroethane ND 0.10 " <br /> Di-isopropyl ether ND 0.10 <br /> Ethyl tert-butyl ether ND 0.10 r <br /> 1 Methyl tert-butyl ether NTD 0.10 fr <br /> Tert-amyl methyl ether ND 0.10 l <br /> Tert-butyl alcohol ND 5.0 <br /> 1 Surrogate:l,2-Dichloroethane-d4 2.46 2.50 98.4 70-121 <br /> Surrogate: Toluene-d8 2.46 2,50 98.4 8I-117 <br /> LCS(1090053-BS1) - Prepared&Analyzed:09/14/01 <br /> Methyl tert-butyl ether 2.34 0.10 mg/kg 2,50 93.6 70-130 <br /> Surrogate:1,2-Dichloroethane-d4 1.35 2.50 94.0 70-121 <br /> Surrogate:Toluene-d8 2.37 2.50 94.8 81-117 <br /> Matrix Spike 1090053-MS1 Source: S109089-14 Prepared&Analyzed: <br /> k 09/14101 <br /> l{ Methyl tert-butyl ether 2.33 0.10 mg/kg 2.50 ND 93.2 60-140 <br /> 1 1 <br />{ Surrogate: I,2-Dichloroethane-d4 2.15 2.50 90.0 70-121 ` <br /> Surrogate: Toluene-d8 2.36 2.50 94.4 81-117 <br /> i <br /> Matrix Spike Dup 109005_3--MSD1) Source:5109089-14 Prepared&Analyzed:09/14/01 <br /> Methyl tert-butyl ether 2.26 0.10 mg/kg 2.50 ND 90.4 60-140 3.05 25 <br /> Surrogate:1,2-Dichloroethane-d4 2.08 2.50 83.2 70-121 <br /> Surrogate: Toluene-d8 2.15 2.50 86.0 81-117 <br /> I <br /> I <br /> I <br /> I <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> k <br />€ Page Page 23 of 24 <br />