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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 4 {916)921-9600 <br /> A��l�����l FAX(916)92 1-0 100 <br /> Isk"4Wwww sequoialabs corn <br /> Stratus Environmental Project ARCO 6100,Tracy,CA <br /> 3330 Cameron Park Drive,Ste 550 Project Number 6100,Tracy,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 07/05/02 11 10 <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 207001:3-EPA 5030B [PITS <br /> Blank(2070413-BLKI) Prepared&Analyzed 07/01/02 <br /> Tert-butyl alcohol ND 50 ug/l <br /> Methyl tert butyl ether ND 050 <br /> Di-isopropyl ether AID 050 " <br /> Methyl tert-butyl ether AID 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-BS1) Prepared&Analyzed 07/01/02 <br /> Methyl tert butyl ether 240 050 ug/l 250 96 60-140 <br /> Oarogate <br /> 12-DCA-d4 268 250 107 60-140 <br /> trix Spike(2470013-MS1) Source 5206339-01 Prepared&Analyzed 07101102 �� <br /> Methyl tert-butyl ether 270 050 ug/l 250 ND 106 60-140 <br /> Surrogate 12-DCA-d4 263 250 105 60-140 <br /> Matrix Spike Dup(2070013-MSD1) Source 5206339-01 Prepared&Analyzed 07/01/02 <br /> Methyl tert-butyl ether .267 050 ug/1 250 ND 105 60-I40 1 25 <br /> Surrogate 12-DCA-d4 252 _--_---"_— Y250 101 60-140 ��----- <br /> quota Analytical- Sacramento The results m this report apply to the samples analyzed in accordance with the chain of <br /> custody docurnent This analytical report must be reproduced in its entirety <br /> Page 6 of 7 <br />