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pGettler-Ryan/Geostrategies(l) Project Tosco(l) <br /> 6747 Sierra Court,Suite 3 Project Number Tosca#5886,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/25/01 16 59 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-San Carlos <br /> Reporting Spike Sousse %REC RPD <br /> LA=lYte Result Lunit Units level Result °/*REC Lmrts RPD lutist Notes <br /> Batch 1050074-EPA 5030B PIT <br /> Blank(1050074-BLK2) Prepared&Analyzed 05/18/01 <br /> Ethanol ND 1000 119/1 <br /> 1,2-Dibnomoethane ND 200 " <br /> 1,2-Dichloroethane ND 200 " <br /> Di-isopropyl ether ND 200 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether ND 200 " <br /> Teat-amyl methyl ether ND 200 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethaned4 447 500 894 76-114 <br /> Surrogate Toluene-d8 512 500 102 88-110 <br /> Ask(1050074-BSI) Prepared&Analyzed 05/17/01 <br /> Methyl tert-butyl ether 460 200 ug/l 500 920 70-130 <br /> Surrogate 12-Dichloroethaned4 496 500 992 76-114 <br /> Surrogate Toluene-0 538 500 108 88-110 <br /> LCS(1050074-BS2) Prepared&Analyzed 05/18/01 <br /> Methyl tert-butyl ether 452 200 ug/l 500 904 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 470 500 940 76-114 <br /> Surrogate Toluene-d8 506 " 500 101 88-110 <br /> Matrix Spike(1050074-MS1) Source L105074-12 Prepared&Analyzed 05/17/01 <br /> Methyl tert-butyl ether 464 200 ug(l 500 ND 928 60-140 <br /> Surrogate 1 1-Dichloroethaned4 480 500 960 76-114 <br /> Surrogate Toluene-d8 51 3 50 0 105 88-I10 <br /> Matrix Spike Dup(1050074-MSD1) Source L105074-12 Prepared&Analyzed 05/17/01 <br /> Methyl tert-butyl ether 458 200 ug/l Soo ND 916 <br /> 60-140 1 30 25 <br /> Surrogate 1,1-Dichloroethaned4 484 <br /> 500 968 76-114 <br /> Surrogate Toluene-d8 <br /> 512 " 500 102 88-110 <br /> quota Analytical-Sail Carlos <br /> The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report most be reproduced in Its entirety { <br /> Page 26 of 28 <br />