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819 Striker Avenue,Suite 8 Sequoia Sacramento,CA 95834 (916)921-9600 Analytical FAX(916)92]-0100 loco www.sequoia[abs.com Delta Environmental Consultants(Cameron Park) Project: ARCO 548, Stockton, CA 3330 Cameron Park Dr. Project Number: N/A Reported: Cameron Park CA,95682 Project Manager: Jay Johnson 03/29/01 11:40 Volatile Organic Compounds by EPA Method 8260A Sequoia Analytical - Morgan Hill Reporting! Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-1-25' (5103261-01)Water Sampled: 03/14/0109:34 Received:03/14/01 12:00 tert-Butyl alcohol ND 20.0 ug/l I 1C27017 03/23/01 03/23/01 EPA 8260A Methyl tert-butyl ether 19.0 1.00 " Di-isopropyl ether ND 1.00 " Ethyl tert-butyl ether ND 1.00 tert-Amyl methyl ether ND 1.00 " 1,2-Dichloroethane 8.05 1.00 " Ethylene dibromide ND 1.00 " Surrogate: 1,2-Dichloroethane-d4 84.8% 70-130 " MW-2-25' (5103261-02)Water Sampled: 03/14/0108:57 Received: 03/14/01 12:00 tert-Butyl alcohol ND 100 ug/l 5 1C27017 03/23/01 03/24/01 EPA 8260A Methyl tent-butyl ether ND 5.00 " Di-isopropyl ether ND 5.00 " Wtc rt-butyl ether ND 5.00 " yl methyl ether ND 5.00 " 1,2-Dichloroethane 7.45 5.04 " Ethylene dibromide ND 5.00 Surrogate: 1,2-Dichloroethane-d4 92.3 % 70-130 " MW-3-24' (S103261-03)Water Sampled:03/14/0108.18 Received: 03/14/01 12:00 tent-Butyl alcohol 23.2 20.0 ug/l I 1C27017 03/23/01 03/24/01 EPA 8260A Methyl Cert-butyl ether ND 1.00 " Di-isopropyl ether ND 1.00 " Ethyl tert-butyl ether ND 1.00 " tert-Amyl methyl ether ND 1.00 1,2-TDND I.An . amu Ethylene dibromide ND 1.00 " Surrogate: 1,2-Dichloroelhane-d4 94.5% 70-130 oia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Page4of8'