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819 Stnker Avenue Suite 8 <br /> S e qu o l a Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> K ) <br /> 0 N-0 Analytical www sequoialabs com <br /> Delta Environmental Consultants(Cameron Park) Project Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number ARCO 6100,Tracy,CA Reported <br /> Cameron Park CA, 95682 Project Manager Jay Johnson 11/19/01 14 48 <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 %PEC Limits RPD Limit Notes <br /> Batch 111.0102 -EPA 5030B [P/T] <br /> Blank(1110102-BLKI) Prepared&Analyzed 11/09/01 _ <br /> Tert-butyl alcohol ND 100 ug/l <br /> Methyl tert-butyl ether ND to <br /> Di-isopropyl ether ND l 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND 10 " <br /> Ethanol ND 1500 " <br /> Surrogate l 2-DCA-d4 223 250 892 60-140 <br /> ENCS(1110102-BSI) _ Prepared&Analyzed 11/09/01 _ <br /> Methyl tert-bury]ether 237 10 ugtl 250 948 60-140 <br /> �rrogare 1 2-DCA-d4 229 250 916 60-140 <br /> atrix Spike(1110102-MS1) Source S111076-03 Prepared&Analyzed 11/09/01 <br /> Methyl tert-butyl ether - 206 10 ugll 25 0 ND 808 60-140 <br /> Surrogate 1 2-DCA-d4 204 2-)0 816 60-140 <br /> Matrix Spike Dup(1110102-MSD]) Source S111076-03 Prepared&Analyzed 11/09/01 <br /> Methyl tert-butyl ether 235 10 ug/l 250 ND 924 60-140 132 25 <br /> Surrogate 1 2-DCA-d4 — 21 4 '_ 250 856 60-140 <br /> quota Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 6 of 7 <br />