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GeoAnalyticai 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 Recd: 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 /> MW-4 M312643 1.0 8260E Methyl tert-butyl ether (MTBE) ND pg/L <br /> 40 Ethanol ND <br /> 20 tert-Butanol ND <br /> 1.0 di-isopropyl ether(RIPE) ND <br /> 1.0 Ethyl tert-butyl ether(ETBE) ND <br /> 1.0 tert-Amyl methyl ether(TAME) ND <br /> Surrogate Amnt Spiked Amnt Rec. %Recovery QC Limit% <br /> 1,2-Dichloroethane-d4 5.00 5.31 106.2 72-132 <br /> 2-Brono-l-chloropropane 5.00 5.08 101.6 71-134 <br /> 4-Bromofluorobenzene 5.00 4.85 97 74-132 <br /> • MW-3 M312644 1.0 8260B Methyl tert-butyl ether(MTBE) 1.4 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 Amnt Spiked Amnt Rec. %Recovery QC Limit% <br /> 1,2-Dichloroethane-d4 5.00 3.86 77.2 72-132 <br /> 2-Bromo-1-chloropropane 5.00 3.54 70.8 71-134 <br /> 4-13romofluorobenzene 5.00 4.77 95.4 74-132 <br /> MW-2 M312645 20 8260B Methyl tert-butyl ether(MTBE) ND pg/L <br /> 800 Ethanol ND <br /> 400 tert-Butanol ND <br /> 20 di-Isopropyl 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 94.7 94.7 72-132 <br /> 2-Bromo-l-chloropropane 100 97.2 97.2 71-134 <br /> 4-13romofluorobenzene 100 103 103 74-132 <br /> . Elevated detection limits due to matrix interference. <br /> Mario D'Onofrio Donna Keller <br /> ft— n*, +t 11 F7 F)irnr►nr <br />