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819 Stnker Avenue Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequolalabs com <br /> IT Corporation-Sacramento Project Parkinson's ARCO,Stockton <br /> 1433 N Market Blvd,Ste 1 Project Number 880-040 1A/01060000 Reported <br /> Sacramento CA,95834 Project Manager Kathleen Waldo 05/02/01 11 43 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Lima Units Leel Result %REC Limits RPD Limit Notes <br /> Batch 1040332-EPA 5030B [P/TJ <br /> LCS(1040332-BSI) Prepared&Analyzed 04/27/01 <br /> Methyl tert-butyl ether 563 200 ug/l 500 113 60-140 <br /> Surrogate 1,2-DCA-d4 504 „ 500 101 60-140 <br /> Matrix Spike(1040332-MS1) Source 5104325-03 Prepared&Analyzed 04/27/01 <br /> Methyl tert-butyl ether 63 1 200 ug/1 500 122 102 60-140 <br /> Surrogate 1 2-DCA-d4 485 " 300 970 60-140 <br /> Matrix Spike Dup(1040332-MSDI) Source 5104325-03 Prepared&Analyzed 04/27/01 <br /> Methyl tert-butyl ether 650 200 ug/l 500 122 106 60-140 297 25 <br /> Surrogate 12-DCA-d4 499 500 998 60-140 <br /> ch 1040342-EPA 5030BJP/TJ <br /> Blank(1040342-BLKI) Prepared&Analyzed 04/30/01 <br /> Tert-butyl alcohol ND 200 ug/l <br /> Methyl tort-butyl ether ND 200 " <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 515 300 103 60-140 <br /> LCS(1040342-BS1) Prepared&Analyzed 04/30/01 <br /> Methyl tert-butyl ether 505 200 ug/l 500 101 60-140 <br /> Surrogate 1,2-DCA-d4 521 „ 500 104 60-140 <br /> Matrix Spike(1040342-MS1) Source 5104400-01 Prepared&Analyzed 04/30/01 <br /> Methyl tert-butyl ether 866 200 ug/l 500 326 108 60-140 <br /> Surrogate 12-DCA-d4 511 500 102 60-140 <br /> equota 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 8 of 10 <br />