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819 Sinker Avenue,Suite 8 <br /> Sacramento CA 95834 <br /> a— —)I <br /> Sequoia (916)921-9600 <br /> Analtical FAX(916)921 0100 <br /> Y www sequoialabs corn <br /> atus Environmental Protect 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 06/25/02 13 58 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (S206223-01)Water Sampled 06/18/02 08 45 Received 06/18/02 1135 <br /> Tert-butyl alcohol ND 5 0 ug/l 1 2060248 06/20/02 06/20/02 EPA 826013 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Surrogate 12-DCA44 108% 60-140 " <br /> MW-2(S206223-02)Water Sampled 06/18/02 09 50 Received 06/18/02 1135 <br /> Tert-butyl alcohol ND 5 0 ug/l 1 2060216 06/18/02 06/19/02 EPA 8260B <br /> Methyl tert-butyl ether 2 6 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Surrogate 1,2-DCA-d4 109% 60-140 " <br /> AMLW-3 S206223-03 Water Sampled 06/18/02 07 05 Received 06/18/0211 35 <br /> -butyl alcohol ND 5 0 ug/l 1 2060216 06/18/02 06/19/02 EPA 8260B <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 0 50 " <br /> Surrogate 12-DCA-d4 106% 60-140 11 " <br /> _MW-4(5206223-04)Water Sampled 06/18/02 06 21 Received 06/18/02 11 35 <br /> Tert-butyl alcohol ND 5 0 ug/l 1 2060248 06/20/02 06/20/02 EPA 8260B <br /> Methyl tert-butyl ether ND 0 50 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 <br /> Tert-amyl methyl ether ND 050 " <br /> Surrogate 1,2-DCA44 118% 60-140 <br /> quota Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical repo)i must be reproduced in its entirety <br /> Page Page 5 of 10 <br />