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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> 1W Analytical FAX(408)7826309 <br /> www sequoialabs coir <br /> RS Corporation rll Project ARCO#2093,Tracy,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#2093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 09/30/02 08 20 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2124029-EPA 5030B P/T <br /> Blank(2124029-BLKI) Prepared&Analyzed 09/24/02 <br /> Ethanol ND 40 ug/1 <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tent-butyl ether ND 0 50 " <br /> Di-isopropyl ether ND 0 50 <br /> Ethyl tert-butyl ether ND 0 50 " <br /> tert-Amyl methyl ether ND 0 50 <br /> 1,2-Dichloroethane ND 0 50 <br /> Ethylene dibromide ND 0 50 " <br /> Surrogate 12-Dichloroethane-d4 5 71 500 114 78-129 <br /> LC5(2124029-BSI) Prepared&Analyzed 09/24/02 <br /> Methyl tert-butyl ether 954 050 ug/l 10 0 954 63-137 <br /> 4"rogate 1 2-Dichloroethane-d4 5 98 " 5 00 120 78-129 <br /> C5 Du (2124029-BSD1 Pre ared&Anal zed 09/24/02 <br /> Methyl tert-butyl etber 960 050 ug/1 100 960 63-137 0 627 13 <br /> Surrogate 1 2-Dichloroethane-d4 606 500 121 78-129 <br /> Batch 2I25007-EPA 5030B PIT <br /> Blank 2125007-BLKI Prepared&Anal zed 09/25/02 <br /> Ethanol ND 40 ug/1 <br /> cert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> tert-Amyl methyl ether ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethylene dibromide ND 050 " <br /> Surrogate 12-Dichloroethane-d4 591 5 00 118 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its eniirery <br /> 11 of 13 <br />