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4D (40q ss5 Jarvis Dr <br /> Sequoia Mogan HiD,CA 95037 <br /> 1W Analytical FAX <br /> 8)776-9600 <br /> (408)782-6308 <br /> www sequoialabs cam <br /> 01 Stratus Environmental Inc Project ARCO#2130 MLL0778 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/08/03 1149 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Linut Notes <br /> Batch 2120497-EPA 5030B [PIT] <br /> Blank(2120497-BLKI) Prepared&Analyzed 12/31/02 <br /> Tert-butyl alcohol ND 50 ug/I <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl inethyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Surrogate 1 2-DCA-d4 276 250 110 60-140 <br /> Laboratory Control Sample(2120497-BS1) Prepared&Analyzed 12/31/02 <br /> Methyl tert-butyl ether 175 050 ug/l 224 78 60-140 <br /> Surrogate 12-DCA-d4 279 " 250 112 60-140 <br /> Matrix Spike(2120497-MS1) Source S212663-04 Prepared&Analyzed 12/31/02 <br /> Methyl tert-butyl ether 177 050 ug/l 224 ND 77 60-140 <br /> Surrogate 1 2-DCA-d4 299 250 120 60-140 <br /> Matrix Spike Dup(2120497-MSDI) Source 5212663-04 Prepared&Analyzed 12/31/02 <br /> Methyl tert-butyl ether 200 050 ug/l 224 ND 87 60-140 12 25 <br /> Surrogate 1 2-DCA-d4 314 250 126 60-140 <br /> Batch 3010010-EPA 5030BIP/T] <br /> Blank(3010010-BLKI) Prepared&Analyzed 01/01/03 <br /> Teri-butyl alcohol ND so ug/I <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 050 " <br /> Ethanol ND 50 " <br /> Surrogate 12-DCA-d4 308 250 123 60-140 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 9 of I 1 <br />