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819 Straker Avenue Suite 8 <br /> Sequoia SacramentoC95834 <br /> (91916)922 1-9600 <br /> 4 ID FAX(916)921-O 100 <br /> I Analytical www sequoialabs corn <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 bruits RPD Limit Notes <br /> Batch 2080234-EPA 5030B [PIT] <br /> LCS(2080234-BSI) Prepared&Analyzed 08/23/02 <br /> Methyl tert-butyl ether 235 050 ug/I 218 108 60-140 <br /> Surrogate 1 2-.DCA-d4 231 250 93 60-140 <br /> Matrix Spike(2080234-MS1) Source 5208287-03 Prepared&Analyzed 08/23/02 <br /> Methyl tert-butyl ether 238 050 ug/l 218 ND 109 60-140 <br /> Surrogate 1 2-DCA-d4 239 11 250 96 60-140 <br /> Matrix Spike Dup(2080234-MSD1) Source S208287-03 Prepared&Analyzed 08/23/02 <br /> Methyl tert-butyl ether 249 050 ug/t 218 ND 114 60-140 4 25 <br /> Surrogate 1 2-ACA-d4 231 250 93 60-140 <br /> i <br /> oia 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 in its entirety <br /> Page 10 of 11 <br />