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885 Jarvis Drive <br /> a— ) Sequoia Morgan Hill,CA 95037 <br /> (408'779600 <br /> Analytical <br /> FAX(408)782-6308 <br /> www sequoialabs wrr <br /> URS Comoratton{11 Project ARCO#6020,Manteca,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 10/24/02 11 03 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hall <br /> Reporting Spike Source %REC RPA <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2JO9022-EPA 5030E P/T <br /> Matrix Spike(2J09022-MS1) Source NMI0739-01 Prepared 10/08/02 Analyzed 10/09/02 <br /> Methyl tert-butyl ether 148 0 50 ug/l 200 ND 740 0-200 <br /> Surrogate 1 2-Dichloroethane-d4 431 11S 00 862 78-119 <br /> Matrix Spike Dup(2309022-MSDI) Source MLI0739-01 Prepared 10_/_08102 Analyzed 10_/09/02 <br /> Methyl tert-butyl ether 176 0 50 LIM 200 ND 88 0 0-200 17 3 200 <br /> Surrogate 1 2-Dichloroethane-d4 432 S 00 864 78-129 <br /> 0 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> is <br /> of custody document This analytical report must be reproduced in its entirety <br /> 10 of 11 <br />