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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 4 (916)921 9600 <br /> FAX(916)921-0100 <br /> -1%0 Analytical www sequotalabs corn <br /> is <br /> Stratus Environmental Project Arco 2130,Stockton,CA <br /> 3330 Cameron Park Drive,Ste 550 ProjectNumber 2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 09/18/02 17 43 <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 2090102-EPA 5030B [P/T1 <br /> Blank(2090102-BLKI) Prepared&Analyzed 09/12/02 <br /> Tert-butyl alcohol ND 50 ug/l <br /> Methyl Cert-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 1 2-DCA-d4 251 250 100 60-140 <br /> LCS(2090102-BSI) Prepared&Analyzed 09/12/02 <br /> Methyl tert butyl ether 227 050 ug/1 218 104 60-140 <br /> Surrogate 1 2-DCA d4 231 250 9.2 60-140 <br /> Six Spike(2090102-MSI) Source S209148-01 Prepared&Analyzed 09/12/02 <br /> Methyl tert-butyl ether 23 6 050 ug/l 21 8 ND 108 60-140 <br /> Surrogate 1 2-DCA-d4 221 " 250 88 60-140 <br /> Matrix Spike Dup(2090102-MSD1) Source 5209148-01 Prepared&Analyzed 09/12/02 <br /> Methyl tert-butyl ether 242 050 ug/1 218 ND 111 60-140 3 25 <br /> Surrogate 1 2-DCA d4 233 250 93 60-140 <br /> oia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Thos analytical report must be reproduced in its entirety <br /> Da Page 8 of 9 <br />