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819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> Sequoia (916)921-9X)00 <br /> IDFAX(916)921-0100 <br /> Analytical www sequolalabs com <br /> s <br /> Stratus Environmental project ARCO 2168,Stockton,CA <br /> 3330 Cameron Park Drive,Ste 550 Project Number 2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 08/28/02 14 29 <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 LirnAS RPD Limit Notes <br /> Batch 2080221 -EPA 5030B [PIT] <br /> Blank(2080221-BLK1) Prepared&Analyzed 08/22/02 <br /> Tert-butyl alcohol ND 50 ug/1 <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 1 2-DCA-d4 242 250 97 60-140 <br /> LCS(2080221-BSI) Prepared&Analyzed 08/22/02 <br /> Methyl ten-butyl ether 21 9 050 ugll 21 8 100 60-140 <br /> gate 12-DCA-d4 221 11250 88 60-140 <br /> Matrix Spike(2080221-MSI) Source 5208249-03 Prepared&Analyzed 08/22/02 <br /> Methyl tert-butyl ether 241 050 ug/l 21 8 066 108 60-140 <br /> Surrogate 1 2-DCA-d4 219 11250 88 60-140 <br /> Matrix Spike Dup(2080221-MSDI) Source S208249-03 Prepared&Analyzed 08/22/02 <br /> Methyl tert-butyl ether 246 050 ugll 21 8 066 110 60-140 2 25 <br /> Surrogate 12-DCA-d4 230 250 92 60-140 <br /> Batch 2080234-EPA 5030B [PIT] <br /> Blank(2080234-BLK1) Prepared&Analyzed 08/23/02 <br /> Tert-butyl alcohol ND 50 ugll <br /> Methyl tcrt-butyi 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 11-DCA-d4 246 250 98 60-140 <br /> uoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Thos analytical report must be reproduced in its entirety <br /> Page 9 of 11 <br />