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1551 Industnal Road <br /> ■ t <br /> Sequoia 01a 4 T �- San Carlos 23 -9600 _ <br /> 1_..r `1 (650)232-9600 <br /> *A moi Analytical- - -= - --_ - - -- — - - --- _ - ~-__ _= FAX{650)232-9612 - - - <br /> -� � '� www sequoialabs win <br /> Genier-RyanlGeostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court, Suite! Project Number Tosco-45886,Stockton,CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 10/01/01 13 07 <br /> -- T� MTBE by�DHS+UFT- Quality Control- —� --- <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %R£C RPD <br /> Analvte Result Limit Units -= Level -Result- %REC Limits RPD -Lunt - Notes - - <br /> -- Batch 1090108-EPA 5030B(PIT) <br /> Matrix Spike(1090108-MSI) Source 1_109102-04 Prepared&Analyzed 09/26/01 ' <br /> Methyl tert-butyl ether 332 50 ug/l ND 60-140 <br /> Surrogate a a a-TrIuorotoluene 106 1, 100 106 60-140 <br /> Matrix Spike Du (1090108-MSDI) Source L109102-04 Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether 439 50 ugfl ND 60-140 25 <br /> Surrogate aaa-Tri)?uorotoluene 102 100 102 60-140 <br /> • <br /> i <br /> Sequoia Analytical-San Carlos The resalts in this report apply to the samples analyed in accordance with the chain oJW <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 5 of 6 <br />