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a 7y r� Striker Avenue Suite 8 <br /> ® Sequoi 819 Sacramento CA 95834 <br /> (916)921-9600 <br /> 100 <br /> Analytical <br /> `Tocol FAX equ 921s com <br /> j-', 1 Y www sequoialabs con <br /> Delta Environmental Consultants(Cameron Park) Project Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr Project Number N/A Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 02/23/01 16 00 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - 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 1020161 -EPA 5030B [PIT <br /> Blank(1020161-BLK1) Prepared&Analyzed 02/20/01 <br /> Tert-butyl alcohol ND 200 ug/l <br /> Methyl tert-butyl ether ND 2 00 " <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 " <br /> Tert-amyl methyl ether ND 200 " <br /> Ethanol ND 3000 <br /> Surrogate 12-DCA-d4 469 11 500 938 60-140 <br /> LCS(1020161-BSI) Prepared&Analyzed 02/20/01 <br /> Methyl tert-butyl ether 470 200 ug/l 500 940 60-1400 T <br /> gate 1 2-DCA-d4 469 1 500 938 60-140 <br /> Dup(1020161-BSD1) Prepared&Analyzed 02/20/01 <br /> Methyl tert-butyl ether 48 8 2 00 ug/l 500 976 60-140 376 25 <br /> Surrogate 1 2-DCA-d4 474 " -500 948 60-140 <br /> Matrix Spike(1020161-MSI) Source S102116-07 Prepared&Analyzed 02/20/01 <br /> Methyl tert-butyl ether 466 2 00 ug/l 500 ND 932 60-140 <br /> Surrogate 1 2-DCA-d4 461 500 922 60-140 <br /> Matrix Spike Dup(1020161-MSD1) Source 5102116-07 Prepared&Analyzed 02/20/01 <br /> Methyl tert butyl ether 489 200 ug/l 500 ND 978 60-140 482 25 <br /> Surrogate 12-DCA-d4 477 " 500 954 60-140 <br /> OIa Analytical - Sacramento The results in this report apply to the samples anal}Med in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 5 of 6 <br />