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/ F7 <br /> I/ Sequoia 1551 nal Road <br /> ,�D <br /> San Carlos <br /> CA 44070 <br /> Analytical (550)232-9600 <br /> , <br /> FAX(650)232-4612 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrategies(l) Project Tosco(l) <br /> 6747 Sierra Court, Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Pro)eet Manager Deanna Harding 05/21/02 13 26 <br /> Gasolinc\BTEXIOxygenates by EPA method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> _ Reporting Spike Source %REC m RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPA Limit Notes <br /> Batch 2050109-EPA 5030B IPITI <br /> Matrix Spike Dup(2050109-MSDI) Source 5205070-16 Prepared 05/10/02 Analyzed 05/11/02 - <br /> Benzene 345 050 ug/l 3 35 ND 103 70-130 4 25 <br /> Toluene 189 0 50 202 053 91 70-130 4 25 <br /> Methyl ten-butyl ether 5 a2 050 545 051 94 60-140 2 25 <br /> Gasoline(C6-C10) 203 50 275 ND 74 60-140 5 25 <br /> Surrogate 1 1-DCA-d4 262 250 105 60-140 <br /> Surrogate Toluene-d8 245 250 98 60-140 <br /> Surrogate 4-BFB 257 250 103 60-140 <br /> Batch 2050122=EPA 5030B IP/TJ <br /> Blank(2050122-BLK1) Prepared&Analyzed 05/15/02 <br /> Benzene ND 050 ugA <br /> Toluene ND 030 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 <br /> Methyl tert-butyl ether ND 050 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate 1 2-DCA-d4 244 250 98 60-140 <br /> Surrogate Toluene-d8 246 250 98 60-140 <br />--Surrogate 4BFB 24 7 -- 25 0 99 60-140 <br />—LCS(2050122-BSI) _ .. - Pre ared&Analyzed 05/15/02=- - <br /> T ` <br /> Benzene 321 0 50 ug/l 3 35 96 70-130 � T� <br /> Toluene - ----- ---- - - - —195 =--05() 20 2- _ - "-- 97 70-130 <br /> Methyl tert-butyl ether 5 I4 050 545 94 60-140 <br /> Gasoline(C6-C10) 227 50 275 83 70-130 <br /> Surrogate 11-DCA-d4 247 250 99 60-140 <br /> Surrogate Toluene-d8 234 250 94 60-140 <br /> Surrogate 4-BFB 212 25 0 85 60-140 <br /> Sequoia Analytical - San Carlos The results in this eeport apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 1 l of 13 <br />