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12/21/2001 11:32 5720916 GEOANALYTICAL LAB PAGE 08 <br /> GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone(2091572-0900 Fax (209) 572-0916 <br /> CERTIFICATE OF ANALYSIS <br /> Report0 M334-13 Oxygenates Date: 12/06/01 <br /> Thorpe Oil Project 200 Beckman Rd. DateRec* 11/30/01 <br /> PO Box 357 Date Started: 11/30/01 <br /> Lodi CA 95241 POS P <br /> Date Com leted: 12/05/01 <br /> Date Sampled: 11/30/01 <br /> Sampler. R Azevedo(Geo) <br /> Sample ID Lab YD RL Method Analyte Results units <br /> TK 3 East 0 9' M203803 10 8260E Methyl tert-butyl ether(MTBE) ND pg/Kg <br /> 400 7210 Ethanol ND <br /> 200 7420 tert-Butanol ND <br /> 10 7520 di-Isopropyl ether(DIPE) ND <br /> 10 7950 Ethyl tert-butyl ether(ETBE) PID <br /> 10 tert-Amyl methyl ether('FAME) ND <br /> Surrogate Amnt Spiked Amnt Ret %Recovery QC Limit% <br /> 1,2-Didiloroethane-d, 100 71.4 71.4 66-133 <br /> 2-13romo-l-chioropropane 100 110 110 63-139 <br /> 4-Bromofluoro3enzene 100 90.6 90.6 64-136 <br /> TK 3 West 0 9' M203804 10 82608 Methyl tent-butyl ether(MTBE) NDK <br /> lrg/ g <br /> 400 Ethanol ND <br /> 200 <br /> tart-Butanol ND <br /> 10 di-isopropyl ether(DIPS) ND <br /> 10 Ethyl ten-butyl ether(ME) ND <br /> 10 tet-Amyl methyl ether(TAME) ND <br /> Surrogate Amnt Spiked AmM Ree %Recovery QC Lin*% <br /> 1,2-Diehloroethane-d, 100 106 106 66-133 <br /> 2-Bromo-l-rhlompropane 100 109 109 63-139 <br /> 4-Bromofluorobenzene 100 97.9 97.9 64-136 <br /> Stock Pile k1 South,Stock Pile k2 M203805, 10 82608 Methyl tert-butyl ether(MTBE) ND <br /> WKg <br /> East,Stock Pile M3 North M203806, 400 Ethanol <br /> M203807 200 tert-Butanol ND <br /> 10 di-Isopropyl ether(DwE) ND <br /> 10 Ethyl tert-butyl ether(ETRE) ND <br /> 10 tert-Amyl methyl ether(TAME) ND <br /> Surrogate Amm Spiked Amnt Rw- %Recovery QC Limit% <br /> 1,2-Dirhloroethane-d4 100 104 104 66-133 <br /> 2-Bromo-l-chloropropane 100 121 121 63-139 <br /> 4-Bromofluorobanzene 100 90.3 90.3 64-136 <br /> ario er <br /> Donna Keller <br /> Chemist Certification 1t 1157 Laboratory Director <br />