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4,l <br /> a <br /> Gettler-11yanlGeostrategies(1) Project Tosco(l) <br /> Project Number Unocal Circle K SS#1205,Lathrop,CA Reported <br /> 6747 Sierra Court,Suite J 05/10/01 15 16 <br /> Dublin CA,94568 Project Manager Deanna Harding <br /> Volat>tle Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting rnn Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1040099-EPA 5030B [PIT] <br /> Blank(1040099-BLK4) Prepared&Analyzed 05/01/01 <br /> Ethanol ND 1000 ug/i <br /> 1,2-Dibromoetbane 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 /> Tert-amyl methyl ether ND 200 " <br /> Tert-butyl alcohol ND 100 <br /> 41 8 50 0 83 6 76-114 <br /> Surrogate I 1-Dichloroethane-d4 90 8 88-110 <br /> Wate Toluene-d8 454 500 <br /> 1040099-BSI) Prepared&Analyzed 04/27/01 <br /> 2 00 ug <br /> Methyl tert-butyl ether 489 a 50 0 97 8 70-130 <br /> 47 7 500 954 76-714 <br /> Surrogate 11-Dtchloroethane-d4 109 88-110 <br /> Surrogate Toluene-d8 543 <br /> 50 0 <br /> LCS(1040099-BS2) Prepared&Analyzed 04/27/01 <br /> Methyl tent-butyl ether 468 200 ug/l 500 936 70-130 <br /> 43 3 500 866 76-114 <br /> Surrogate 12-Dtchloroethane-d4 90 0 88-110 <br /> Surrogate Toluene-d8 450 500 <br /> LCS(1040099-BS3) Prepared&Analyzed 04/30/01 <br /> Methyl tert-butyl ether <br /> 47 8 200 ug/l Soo 956 70-130 <br /> 50 0 91 4 76-114 <br /> Surrogate 11-Dtchloroethane-d4 461 103 88-110 <br /> Surrogate Toluene-d8 515 500 <br /> LCS(1040099-BS4) Prepared&Analyzed 05/01/01 <br /> Methyl tent-butyl ether <br /> 511 200 119/1 500 102 70-130 <br /> 47 3 500 946 76-114 <br /> Surrogate 12-Dtchloroethane-d4 101 88-IIO <br /> Surrogate Toluene-d8 505 500 <br /> Sequoia Analytical- San Carlos ne 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 14 of 16 <br />