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a _ 885 Jarvis Dr Sequoia Morgan Hall,CA 95037 (408)776-9600 MW www Analytical FAX(408)782-6308 sequoialabs com Stratus Environmental Inc Project ARCO#2130 MLL0779 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2130,Stockton,CA Reported Cameron Park CA,95682 Project Manager Jay Johnson 01/10/03 16 20 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical- Sacramento Reporting Analyte Result Lurut Units Dilution Batch Prepared Analyzed Method Notes VW-11 L0779-09 Water Sam led 12/14/02 12 24 Received 12/19/02 15 SS Tert-butyl alcohol ND 5 0 ugfl 1 3010011 01/02/03 01/03/03 EPA 8260B HT-04 Methyl tert-butyl ether 098 050 to " " HT-04 Di-isopropyl ether ND 050 It " " " HT-04 Ethyl tert-butyl ether ND 050 " " " HTS Tert-amyl methyl ether ND 050 HT-04 Surrogate 1,2-DCA-d4 130% 60-140 HT-04 VW-12(NML0779-10)Water Sampled 12/14/0213 15 Received 12/191021555 Tert-butyl alcohol ND 200 ug/1 1 2120520 01/02/03 01/02/03 EPA 8260B A-01 Methyl tent-butyl ether 26 050 Di-isopropyl ether ND 050 Ethyl tort-butyl ether ND 050 " Tert-amyl methyl ether ND 050 Surrogate 12-DCA-d4 60% 60-140 " "S-IB L0779-12 Water Sampled 12/19/02 13 26 Received 12/19/02 15 55 "WKert-butyl alcohol ND 200 ug/l 1 2120520 01/02/03 01/02/03 EPA 8260B A-01 Methyl tert-butyl ether ND 050 Di-isopropyl ether ND 050 Ethyl tent-butyl ether ND 050 Tert-amyl methyl ether ND 050 " Surrogate 1,1-DCA-d4 114% 60-140 " MS-2A L0779-13 Water Sampled 12/19/02 12 57 Received 12/19/0215 55 Tert-butyl alcohol ND 200 ug/1 1 2120520 01/02/03 01/02/03 EPA 8260B A-01 Methyl tert-butyl ether 079 050 " Di-isopropyl ether ND 0 50 " Ethyl tent-butyl ether ND 050 " Tert-amyl methyl ether ND 050 Surrogate 1 2-DCA-d4 124% 60-140 " i quota Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety 9 of 17