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819 Striker Avenue Suite 8 <br /> • S e o u o 1 a Sacramento C 95834 <br /> 6 1 A (916)921-9600 1-9600 <br /> FAX(916)92 l-0100 <br /> Analytical <br /> al www sequoialabs com <br /> Stratus Environmental Protect. ARCO 6100,Tracy,CA <br /> 3330 Cameron Park Drive,Ste 550 Project Number 6100,Tracy,CA Reported <br /> Cameron Park CA,95682 Prosect Manager Jay Johnson 07/03/02 13 11 <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 2070013-EPA 5030B [P/TI <br /> Blank(2070013-BLKI) Prepared&Analyzed 07/01/02 <br /> Tert-butyl alcohol ND 5 0 ue <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 /> Surrogate 11-DCA-d4 288 250 115 60-140 <br /> LCS(2070013-BSI) Prepared&Analyzed 07/01/02 <br /> Methyl tert-butyl ether 240 050 ug/1 250 96 60-140 <br /> 4orrogate 1 2-DCA-d4 f 268 2.50 107 60-140 <br /> atria Spike(2070013-MSI} Source 5206339-OI Prepared& gnalyzed 07101/02 <br /> Methyl tert-butyl ether 270 050 ug/1 250 ND 106 60-140 <br /> Surrogate 12-DCA-d4 263 11250 105 60-140 <br /> Matrix Spike Dup(2070013-MSD1) Source S206339-01 Prepared&Analyzed 07/01/02 <br /> Methyl tert-butyl ether 267 050 ug/1 250 ND 105 60-140 1 25 <br /> Surrogate 1 2-DCA-d4 --- 252 mm 230 y� � ���101 60-140 <br /> equoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirely <br /> Page 5 of 6 <br />