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885 Jarvis Dr <br /> Sequoia Magin Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs can <br /> Stratus Environmental Inc Project ARCO#2130 MLL0779 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 011101011120 <br /> Volatile Orgamc Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lumxt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120520-EPA 5030B[PIT] <br /> Matrix Skp ke Dup(2120520-MSDI) Source 5212546-01 Prepared 01/02/03 Analyzed 0_1103103 <br /> Methyl tert-butyl ether T 216 050 ug/l 224 10 92 I-�60 140 3 25 <br /> Surrogate 12-DCA-d4 302 250 121 60-140 <br /> Batch 3010011-EPA 5030B[P/Tl <br /> Blank(3010011-BLK1) Prepared&Analyzed 01/02/03 <br /> Teri-butyl alcohol ND 50 ug/l <br /> Methyl ter(-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 /> Wanol ND 50 " <br /> Surrogate 12-DCA-d4 311 250 124 60-140 <br /> Blank(3010011-BLK2) Prepared&Analyzed 01/03/03 <br /> Tert-butyl alcohol ND 50 ugll <br /> Methyl tett-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 300 250 120 60-140 <br /> Laboratory Control Sample(3010011-BS1) Prepared&Analyzed 01/02/03 <br /> Methyl tertbutyl ether 188 050 ug/l 224 84 60-140 <br /> Surrogate 12-DCA-d4 312 250 125 60-140 <br /> orquota 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 /> This analytical report must be reproduced in its entirety <br /> 15 of 17 <br />