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® Sequoia 404 N WiLane <br /> Walnut Creek CAA 94598 <br /> i4 (925)988-9600 <br /> Analytical www <br /> (925)988-967'3 <br /> awsequoialabs corn <br /> Gettler Ryan, Inc. -Dublin Project Tosco <br /> 6747 Sierra Court Suite I Project Number Tosco# 11 192 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 24-Aug-01 09 09 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 1H16012- EPA 5030B(MeOH) <br /> Blank(1"16012-BLKI) Prepared&Analyzed 16-Aug-01 <br /> Ethanol ----ND - -- 25- mg/kg -� <br /> tert-Butyl alcohol ND 2 5 " <br /> Methyl tert-butyl ether(MTBE) ND 0 10 " <br /> Di-isopropyl ether ND 0 10 <br /> Ethyl tent butyl ether ND 0 10 " <br /> 1 2 Dichloroethane ND 010 <br /> ter[-Amyl methyl ether ND 0 10 " <br /> 12-Dibromoethane ND 010 " <br /> Surrogate Dabromofluoromethane 2j8 250 952 50-150 <br /> Surrogate 12-Dichloroethane-d4 214 250 856 50-150 <br /> 0(IH16012-BSI) T 'T _ ___� Prepared&Analyzed 16-Aug-01 <br /> ethyl tert-butyl ether(MTBE) 234 0 10 mg/kg 2 50- 93 6 70-130 <br /> Surrogate Dibromofluoromethane 236 T� 230 -_ -- — 944 50-150 <br /> Surrogate 12-Drchloroethane-d4 214 " 250 856 50-150 <br /> Matrix Spike(1H16012-MSI) Source W108160-02 Prepared&Analyzed 16-Aug-01 <br /> Methyl tert-butyl ether(MTBE) - 2 54 0 f 0 mg/kg -Y-50--- ND - 102 60-140-- <br /> Surrogate <br /> 0-140TSurrogate Dibromofluoromethane _ 2 43- _ 250 -97 2 50-150 <br /> Surrogate 12-Dichloroethane d4 223 250 892 50-150 <br /> �tloia Analytical - Walnut Creek I'he results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 10 of H <br />