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885 Jarvis Dr <br /> 4DSequoia Margm HIR,CA 95037 <br /> Analytical (408)772-{408)782-636300 <br /> FAX 08 <br /> www"quotalabs can <br /> Stratus Environmental Inc Project ARCO 42130 NEL0778 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO 42130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/08/03 11 49 <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 Limit Notes <br /> Batch 3010010-EPA 5030B 1P/T1 _ <br /> Blank(3010010-BLKI) Prepared&Analyzed 01/01/03 <br /> Laboratory Control Sample(3010010-BSI) Prepared&Analyzed 01/01/03 <br /> Methyl tert-butyl ether 190 050 ug/l 224 85 60-140 <br /> Surrogate 12-DCA-d4 296 1. 250 118 60-140 <br /> Matrix Spike(3010010-MS1) Source S212733-01 Prepared 01/01/03 Analyzed 01/02/03 <br /> Methyl tert-butyl ether 167 050 ug/l 224 1 3 69 60-140 <br /> Surrogate 12-DCA-d4 288 250 115 60-140 <br /> Matrix Spike Du (3010010-MSD1) Source S212733-01 Prepared 01/02/03 Analyzed 01/03/03 <br /> Methyl tert-butyl ether 219 050 ug/l 224 1 3 92 60-I40 27 25 QR-02 <br /> Surrogate 1,2-DCA-d4 309 11250 122 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 10 of 11 <br />