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Sequoia 819 Striker Avenue Suite 8 Sacramento CA 45834 4 (916)921-96M 1a) FA921 Analytical www sequoialabs com Delta Environmental Consultants(Cameron ParK) Project Arco 6 j 00,Tracy,CA 3330 Cameron Park Dr Ste 550 ProjectNumber 6100,Tracy,CA Reported Cameron Park CA,95682 Project Manager Jay Johnson 04/04/02 13 51 Volatile Organic Compounds by EPA Method 82605 Sequoia Analytical - Sacramento Reporting Analyte Rcsult Limit Units Dilution Batch Prepared Analyzed Mothod Notes MW-2(5203408-01)Water Sampled 03/26/02 04 39 Received 03/26/02 08 00 Tert-bury]alcohol ND 50 ug/1 1 2030350 03/27/02 03/27/02 EPA 8260B Methyl tert-butyl ether ND 050 " Di-isopropyl ether ND 0 50 " Ethyl tert-butyl ether ND 0 50 " Teri-amyl methyl ether ND 050 " Surrogate 1 2-DCA-d4 125% 60-140 " VW-2(5203408-02)Water Sampled 03/26/02 04 18 Received 03/26/02 08 00 R-05 Tert-butyl alcohol ND 50 ug/l 10 2030350 03/27/02 03/27/02 EPA 8260E Methyl tert-butyl ether 350 5 0 " Di-isopropyl ether ND 5 0 " Ethyl tert-butyl ether ND 5 0 " ert-amyl methyl ether ND 5 Q rogate 1 2-DCA-d4 112% 60-140 " VW-3 (5203408-03)Water Sampled 03/26/02 04 27 Received 03/26/02 08 00 R-05 Tert-butyl alcohol ND 100 ug/1 20 2030350 03/27/02 03/27/02 EPA 8260B Methyl tert-bury!ether 490 10 " Di-isopropyl ether ND 10 " Ethyl tert-butyl ether ND 10 " Tert-amyl methyl ether ND 10 " Surrogate 12-DCA-d4 117% 60-140 " VW-5(5203408-04)Water Sampled 03/26/02 04 00 Received 03/26/02 08 00 Tert-butyl alcohol ND 50 ug/l 1 2030350 03/27/02 03/27/02 EPA 8260B Methyl tert-butyl ether 6 7 0 50 " Df-isopropyl ether ND 050 " Ethyl tert-butyl ether ND 050 " Tert-amyl methyl ether ND 050 Surrogate 1,2-DCA-d4 115% 60-140 " Ank Ciuoia 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 Page 4 of 9