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GeoAnalytical Laboratories, Inc, <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br /> CERTIFICATE OF ANALYSIS <br /> Report# M354-07 Oxygenates Date: 12/31/01 <br /> Date Rec'd: 12/20/01 <br /> Foothill Engineering Project; 4th QTR. 2001 G.W. Date Started: 12/28/01 <br /> 12793 Paddy Creek Lane Date Completed: 12/31/01 <br /> Lodi CA 95240 PO# <br /> Date Sampled: 12/18/01 <br /> Sampler: Don Light <br /> Sample ID Lab ID RL Method Analyte Results Units <br /> M312646 20 8260B Methyl tert-butyl ether(MTBE) 53 pg/L <br /> 800 Ethanol ND <br /> 400 tert-Butanol ND <br /> 20 di-15opropyl ether(DIPE) ND <br /> 20 Ethyl tert-butyl ether(ETBE) ND <br /> 20 tert-Amyl methyl ether(TAME) ND <br /> Surrogate Amnt Spiked Amnt Rec. %Recovery QC Limit% <br /> 1,2-Dichloroethane-d4 100 101 101 72-132 <br /> 2-Bromo-l-chloropropane 100 99.6 99.6 71-134 <br /> 4-Bromofluorobenzene 100 102 102 74-132 <br /> • Trip Blank M312647 1.0 8260B Methyl tert-butyl ether(MTBE) ND pg/L <br /> 40 Ethanol ND <br /> 20 tert-Butanol ND <br /> 1.0 di-Isopropyl ether(DIPE) ND <br /> 1.0 Ethyl tert-butyl ether (ETBE) ND <br /> 1.0 tert-Amyl methyl ether(TAME) ND <br /> Surrogate A=t Spiked Amnt Rec. %Recovery QC Limit% <br /> 1,2-Dichloroethane-d4 5.00 4.82 96.4 72-132 <br /> 2-Bromo-l-chloropropane 5.00 4.63 92.6 71-134 <br /> 4-Bromofluorobenzene 5.00 5.14 102.8 74-132 <br /> ario D'Onoffi6 Donna Keller <br /> f l,�m�ct r'rrHf;riHrm # 11�W Dirertnr <br />