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r � <br /> 819 Striker Avenue Suite 8 <br /> •r Sacramento CA 95834 <br /> Sequoia (916)9Z1-9600 <br /> FAX(916)9Z1-0100 <br /> Analytical www sequosalabs com <br /> ilw <br /> Stratus Environmental Project ARCO 2168,Stockton,CA <br /> 3330 Cameron Park Drive,Ste 550 ProlectNumber 2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Sohnson 06/21/02 12 35 <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 2060204-EPA 5030B IP/T] <br /> LCS(2060204-BS1) Prepared&Analyzed 06/18/02 <br /> Methyl tett-butyl ether 103 050 ug/) 109 94 60-140 <br /> Surrogate 12-DCA-d4 278 11250 111 60-140 <br /> LCS Dup(2060204-BSD1) _ Prepared&Analyzed 06/18/02 <br /> Methyl tert-butyl ether 105 050 ug/l 109 96 60-140 2 25 <br /> Surrogate 1 2-DCA-d4 279 11250 111 60-140 <br /> Matrix Spike(2060204-MSI) Source S206212-07 Prepared&Analyzed 06/18/02 <br /> Methyl tert-butyl ether 196 050 ugA 109 78 108 60-140 ` <br /> Surrogate 12-DCA-d4 282 250 113 60-140 <br /> trix Spike Dup(2060204-MSDI) Source 5206212-07 Prepared&Analyzed 06/18/02 <br /> ethyl tert-butyl ether 198 050 ug/l 109 78 110 60-140 1 25 <br /> Surrogate 12-DCA-d4 283 250 113 60-140 <br /> Batch 2060216-EPA 5030B [PM <br /> Blank(2060216-BLKI) Prepared&Analyzed 06/I8/02 <br /> Tert-butyl alcohol ND 50 ug/l <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 /> Ethanol ND 50 <br /> 1,2-Dichloroethane ND 050 <br /> Surrogate 12-DCA-d4 264 250 106 60-140 <br /> ,qWequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the dram of <br /> custody document This analytical report must be rep>oduced in its entirety <br /> Page 10 of 12 <br />