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6 <br /> Gctticr-Ryan/Geostrategtes(1) Project. Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding ' 02/15/01 13 12 <br /> Volatile Organic S Oxyganated Compounds by EPA Method 8260B- Quality Control - <br /> Sequoia Analytical-San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result - Lumt f Units Level Result %REC Lunrts RPD iamu Notes <br /> Batch 1020022-EPA 5030B [PIT] - - - - - - - T -- -- . <br /> LCS(1020022-BS2) Prepared&Analyzed 02/06/01 <br /> Methyl tent-butyl ether 491 200 ug/1 500 982 70-130 <br /> Surrogate 1,1 Dichloroethane-d4 513 " 500 103 76-114 <br /> Surrogate Toluene-d8 498 500 996 88-110 <br /> LCS(1020022-BS3) Prepared&Analyzed 02/07/01 <br /> Methyl tent-butyl ether 523 200 ugn 500 105 70-130 <br /> Surrogate 1,2 Dichloroethane-d4 533 500 107 76-114 <br /> Surrogate Toluene-d8 503 Soo 101 88-110 <br /> Matrix Spike(1020022-MS1) Source L102011-10 Prepared&Analyzed 02/06/01 <br /> Methyl tert-butyl other 55 2 200 ug/1 Soo ND 110 60-140 <br /> Surrogate 1,1 Dichloroethane-d4 541 " 500 108 76-114 <br /> Surrogate Toluene-l8 50 7 500 101 88-110 <br /> Matrix Spike Du (1020022-MSDI) Source L102011-10 Prepared&Analyzed 02/06/01 <br /> _ Methyl tent-butyl ether 485 200 ug/l 500 ND 970 60-140 12 9 25 <br /> Surrogate 1,1-Dichloroethane-d4 506 " 500 101 76-114 <br /> Surrogate Toluene48 _- _r�504_ 500_ _ 101 88-110 . <br /> Sequoia Analybcal-San Carlos The results in this report apply to the samples analyzed in accordance with the chat <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 12 of 13 <br />