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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX(91(5)921-0]00 <br /> Analytical www sequoiaiabs com <br /> Delta Environmental Consultants(Cameron Park) Project ARCO 2186, Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number N/A Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 07/05/01 12 49 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1060126-PPA 5030B (P/T] <br /> Matrix Spike Dup(1060126-MSD1) Source L106178-01 Prepared&Analyzed 06/28/01 <br /> Methyl tert-butyl ether 55 8 20 uWI 500 21 696 60-140 792 25 <br /> Surrogate 1,2-Dichloroethane-d4 504 500 101 76-114 <br /> Batch 1060132- EPA 5030E [P/TJ <br /> Blank(1060132-BLKI) Prepared&Analyzed 06/28/01 <br /> Ethanol ND 1000 ug/1 <br /> Tert-butyl alcohol ND 100 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> ert-amyl methyl ether ND 20 " <br /> rogate 1 2-Dichloroethane-d4 465 500 930 76-114 <br /> Blank(1060132-BLK2) Prepared&Analyzed 07/01/01 <br /> Ethanol ND 1000 ug/I <br /> Tert-butyl alcohol ND 100 " <br /> Methyl tert-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 475 500 950 76-114 <br /> LCS(1060132-BSI) Prepared&Analyzed 06/28/01 _ <br /> Methyl tert-butyl ether 513 20 ug/I 500 103 70-130 <br /> Surrogate 12-Dichloroethane-d4 490 500 980 76-114 <br /> quola 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 entirely <br /> Page 8 of 10 <br />