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I <br /> i <br /> Gettler-Ryan/Geostrategtes(1) Project Tosco(l) <br /> 6747 Sierra Court,Suite] Project Number Tosco#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 /> Repotting Spike Source %REC RPD <br /> Analyte Restilt Lmtt Units Level Result %REC Units RPD Iamit Notes <br /> Batch 1050074-EPA 5030B JPrrJ <br /> Blank(1050074-BLK2) Prepared&Analyzed 05/18/01 <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibromoethane ND 200 <br /> 1,2-Dichloroethane ND 200 " <br /> Di-isopropyl ether ND 200 " <br /> Ethyl tent-butyl ether ND 200 " <br /> Methyl tert-butyl ether ND 200 <br /> Tert-amyl methyl ether ND 200 " <br /> Teat-butyl alcohol ND 100 " <br /> Surrogate 12-Drehloroethane-d4 447 " 500 894 76-114 <br /> Surrogate Toluene-d8 512 500 101 88-110 <br /> _ 1050074-BS1) Prepared&Analyzed 05/17/01 <br /> M yl tert-butyl ether 460 200 ug/l 500 920 70-130 <br /> Sarrogate 12-Dichloroethane-d4 496 500 992 76-114 <br /> Surrogate Toluene-d8 538 500 108 88-110 <br /> LCS(1050074-BS2) Prepared&Analyzed 05/18/01 <br /> Methyl tert-butyl ether 452 200 ug/l Soo 904 70-130 <br /> Surrogate 11-Dichloroethaned4 470 500 940 76-114 <br /> Surrogate Toluene-d8 506 500 101 88-110 <br /> Maim Spike(1050074-MSI) Source L105074-12 Prepared&Analyzed 05/17/01 <br /> Methyl teat-butyl ether 464 200 ugll Soo ND 928 60-140 <br /> Surrogate 1 1-Dichloroethane-d4 480 " 500 960 76-114 <br /> Surrogate Toluene-d8 523 " 500 105 88-110 <br /> Metrix Spike Dup(1050074-MSDI) Source L105074-12 Prepared&Analyzed 05/17/01 <br /> Methyl tent butyl ether 458 200 ug/1 500 ND 916 60-140 130 25 <br /> Surrogate 12-Dichloroethane-d4 484 500 968 76-114 <br /> Surrogate Toluene-d8 512 " 500 102 88-110 <br /> oia Analytical-San Carlos The 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 26 of 28 <br />