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• 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.com <br /> ' j ARCO 760,Lodi,CA <br /> URS-Sac,Gateway Oaks <br /> Project: <br /> URS Gateway Oaks Oa Ste.300 Project Number: 760,Lodi,CA Reported: <br /> ' Sacramento CA,95833 Project Manager: Vernon Elarth 08/30/02 13:59 <br /> Gasoline\BTEX\Oxygenates 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 2080295-EPA 5030B[MeOH] <br /> Blank(2080295-BLKI) Prepared&Analyzed:08/29/02 <br /> Ethylbenzene ND 0.50 mg/kg <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Gasoline(C6-C10) ND 100 ,I <br /> Surrogate:1,2-DCA-d4 2.60 2.50 104 60-140 <br /> Surrogate:Toluene-d8 2.50 2.50 100 60-140 <br /> Surrogate:4-BFB 2.43 2.50 97 60-140 <br /> ' LCS(2080295-BSI) Prepared&Analyzed:08/29/02 <br /> Methyl tert-butyl ether 4.88 0.50 mg/kg 4.36 112 60-140 <br /> Benzene 3.05 0.50 11 2.68 114 70-130 <br /> Toluene 17.1 0.50 16.2 106 70-130 <br /> Gasoline(C6-CIO) 221 100 220 100 70-130 <br /> Surrogate:1,2-DCA-d4 2.58 2.50 103 60-140 <br /> Surrogate:Toluene-d8 2.55 2.50 102 60-140 <br /> Surrogate:4-BFB 2.57 2.50 103 60-140 <br /> LCS Dup(2080295-BSDI) Prepared&Analyzed:08/29/02 <br /> ' Methyl tert-butyl ether 4.92 0.50 mg/kg 4.36 113 60-140 0.8 25 <br /> Benzene 3.04 0.50 2.68 113 70-130 0.3 25 <br /> Toluene 18.3 0.50 16.2 113 70-130 7 25 <br /> Gasoline(C6-C10) 225 100 220 102 70-130 2 25 <br /> Surrogate:1,2-DCA-d4 2.37 2.50 95 60-140 <br /> Surrogate:Toluene-d8 2.77 2.50 111 60-140 <br /> Surrogate:4-BFB 2.77 2.50 111 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain o.J <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 9 of 11 <br />