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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento, 5834 <br /> CA9 99600 <br /> (916)92]-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs coin <br /> 1ta Environmental Consultants(Cameron Park) Project Arco 6100,Tracy,CA <br /> 330 Cameron Park Dr Ste 550 Pr41ect Number Arco 6100,Tracy,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/23/02 11 25 <br /> Volatile Organic Compounds 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 2010260 -EPA 5030B [MeOH <br /> LCS(2010260-BSI) Prepared&Analyzed 01/22/02 <br /> Methyl tent-butyl ether 245 010 mg/kg 250 98 0 60-140 <br /> Surrogate 12-DCA-d4 255 250 102 60-140 <br /> LCS Du (2010260-BSD1) Prepared&Analyzed 01/22/02 <br /> Methyl tert-butyl ether 272 0 10 mg/kg 250 109 60-140 104 25 <br /> Surrogate 12-DCA-d4 269 250 108 60-140 <br /> uola Analytical- Sacramento The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page Page 16 of 17 <br />