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Sequoia Walnu404 ICLane <br /> t Creek,CAA 94598 <br /> (925)988-9600 <br /> Analytical wFAX(925)988-9673 <br /> ww.sequoialabs.coabs.com <br /> �1 <br /> Gettler Ryan, Inc. -Dublin Project: Tosca <br /> 6747 Sierra Court Suite 1 Project Number: Tosca# 11195 Reported: <br /> Dublin CA, 94568 Project Manager: Doug Lee 11-Mar-02 07:42 <br /> Volatile Organic Compounds by EPA Method 8260E - Quality Control <br /> Sequoia Analytical- Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2B26016-EPA 5030B(P/T) <br /> Blank(2B26016-BLKI) Prepared&Analyzed:26-Feb-02 <br /> Ethanol ND 500 ug/I <br /> tert-Botyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyt Cert-bury[ether ND 2.0 " <br /> tert-Amyl methyl ether ND 2.0 " <br /> 1,2-Dichloroethane ND 2.0 " <br /> Ethylene dibromide ND 2.0 " <br /> Sup,ogale Dibromofluoromethane 49.5 50.0 99 50-150 <br /> Surrogate: l,2-Dichloroethane-d4 486 50.0 97 50-150 <br /> (2B26016-BLK2) Prepared&Analyzed:27-Feb-02 <br /> 01 ND 500 ug/1 <br /> tent-Butyl alcohol ND 20 " <br /> Methyl tent-butyl ether(MTBE) ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl ter[-butyl ether ND 2.0 " <br /> tert-Amyl methyl ether ND 2.0 " <br /> 1,2-Dichloroethane ND 2,0 " <br /> Ethylene dibromide ND 2.0 " <br /> Surrogate:Dibromofluoromethane - 52.6 50.0 105 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 38.3 50.0 77 50-150 <br /> LCS(2B26016-BSI) Prepared&Analyzed: 26-Feb-02 <br /> Methyl tert-butyl ether(MTBE) 41.2 2,0 ug/l 50.0 82 70-130 <br /> Surrogate Dibroniq/tuoromethane 50.2 50.0 100 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 51,9 50.0 104 50-150 <br /> . 7uoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> J] custody document. This analytical report must be reproduces'in its entirety. <br /> 8of10 <br />