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S8.19 Straker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> �W Analytical (916)921-9600 <br /> FA3C(916)921-Q10Q <br /> www sequoialabs com <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin HSA S412468 <br />' 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Michelle Zehr 01/04/05 13 32 <br /> GasolinelBTEXIOxygenates by EPA method 8260B-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 4120407-EPA 50308[P/T]/EPA 8260B <br /> _Blank/t4120407_-BLK1) Prepared 12/30/04 Analyzed 12/31/04 <br /> Ethanol ND 50 ug/t <br /> Tert-butyl alcohol ND 50 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 <br /> Tert-amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDS) ND 0 50 " <br /> Benzene ND 0 50 <br /> Ethylbenzene ND 050 <br /> Toluene ND 050 " <br /> ylenes(total) ND 0 50 <br /> asoline Range Organics(C4-C 12) ND 50 <br /> Surrogate 12-DCA-d4 8 44 100 84 60-140 <br /> Surrogate Toluene-d8 9 48 „ 100 95 60-140 <br /> Surrogate 4-BFB 9 88 10 0 99 60-140 <br /> Laboratory Control Sample(4120407-BSI) Prepared&Analyzed 12/30/04 <br /> Methyl tert-butyl ether 164 0 50 ugJl 200 82 60-140 <br /> Benzene 172 0 50 200 86 70-130 <br /> Toluene 179 0 50 200 90 70-130 <br /> Surrogate 1 2-DCA-d4 830 100 83 60-140 <br />' Surrogate Toluene-d8 933 100 93 60-140 <br /> Surrogate 4-BFB 894 100 89 60-140 <br /> Laboratory Control Sample(4120407-BS2) Prepared&Analyzed 12/30/04 _ <br />' Methyl tert-butyl ether 35 7 0 SO UO43 2 83 60-140 <br /> Benzene 23 5 0 50 268 88 70-130 <br /> Toluene 168 0 50 152 111 70-130 <br /> Gasoline Range Organics(C4-C12) 2190 50 2200 100 70-130 <br /> Surrogate 1 2-DCA-d4 9 10 100 91 60-140 <br /> Surrogate Toluene-d8 104 100 104 60-140 <br />' Surrogate 4-BFB 9 71 10 0 97 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document Unless otherwise stated results are reported on a wet <br /> weight basis This analytical report must be reproduced in its entirety <br /> Page 10 of 12 <br />