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(� 1551 lridustnal Road <br /> Sequoia San Carlos 94070 <br /> q (650)232-9600 <br /> FAX(650)232-9612 <br /> , ► Analytical www sequoialabs corn <br /> Ryan/Geostrate gies(I) Prosect Tosco(1) <br /> 6 Sierra Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/21/02 13 26 <br /> Gasoline\BTEXIOxygenates by EPA method 8260E - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050109-BPA 5030B ]P/T] <br /> Blank(2050109-BLK1) Prepared 05/10/02 Analyzed 05/11/02 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl ten-butyl ether ND 050 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate 12-DCA-d4 266 IF <br /> 250 106 60-140 <br /> Surrogate Toluene-d8 241 IF15 0 96 60-140 <br />,Surrogate 4-BFB 23 9 IF 25 0 96 60-140 <br /> LCS(2050109-BSI) Prepared 05/10/02 Analyzed 05/11/02 <br /> Benzene 3 55 050 ug/1 335 106 70-130 <br /> Toluene 188 050 202 93 70-130 <br /> ert-butyl ether 5 27 050 545 97 60-140 <br /> Ga3R9lfne(C6-CIO) 207 50 275 75 70-130 <br /> Surrogate 11-DCA-d4 16 3 15 0 105 60-140 <br /> Surrogate Toluene-d8 237 IF <br /> 250 95 60-140 <br /> Surrogate 4-BFB 226 250 90 60-140 <br /> Matrix Spike(2050]09-MS]) Source 5205070-16 Prepared 05/10/02 Analyzed 05/11/02 <br /> Benzene 3 60 050 ugll 335 ND 107 70-130 <br /> Toluene 197 050 202 053 95 70-130 <br /> Methyl tert-butyl ether 5 74 050 545 051 96 60-140 <br /> Gasoline(C6-C10) 213 50 275 ND 77 60-140 <br /> Surrogate 11-DCA-d4 254 250 101 60-140 <br /> Surrogate Toluene-d8 230 250 92 60-140 <br /> Surrogate 4-BFB 201 250 80 60-140 <br /> is 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 10 of 13 <br />