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" r.. <br /> 885 Jarvis Dr <br /> Sequoia Main Hill, 95037 <br /> (408)77 6-9600-9600 <br /> " Analytical FAX(408) 6308 <br /> t+nvw sequoialablabs corn <br /> Secor-Rancho Cordova Project ARCO#4932,Stockton,CA MLK0860 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/23/02 10 48 <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 2L12027-EPA 5035 <br /> Laboratory Control Sample(2L12027-BS1) Prepared&Analyzed 12/04/02 <br /> Methyl tert-butyl ether 117 050 ug/l 100 117 63-137 <br /> Surrogate 12-Dichloroethane-d4 430 500 860 78-119 <br /> Laboratory Control Sample Du (2L12027-BSDI) Prepared&Analyzed 12/04/02 <br /> Methyl tert-butyl ether 116 050 ug/I 100 116 63-137 0 858 13 <br /> Surrogate 12-Drchloroethane-d4 429 500 858 78-129 <br /> Batch 2L19025-EPA 5030E PIT <br /> Blank(2L19025-BLKI) Prepared&Analyzed 12/17/02 <br /> Methyl tent-butyl ether ND 050 ug/1 <br /> Surrogate 1 1-Dtchloroethane d4 536 500 107 78-129 <br /> Laboratory Control Sample(2LI9025-BSI) Prepared&Analyzed 12/17/02 <br /> Mcthyl tert-butyl ether 938 050 ug/1 100 938 63-137 <br /> Surrogate 12-Dichloroethane-d4 525 500 105 78-129 <br /> Laboratory Control Sample Du (2L19025-BSD1) Prepared&Analyzed 12/17/02 <br /> Methyl tert-butyl ether 933 050 ug/l 100 933 63-137 0 534 13 <br /> Surrogate 1,2-Drchloroethane-d4 494 " 500 988 78-129 <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 /> This analytical report must be reproduced in its entirety <br /> Page 22 of 23 <br />