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' 1455 McDowell Blvd,North Ste D <br /> kNSequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> IW FAX7920342 <br /> www sequoquolalabs com <br />' URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P307347 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br />' Sacramento CA,95833 Project Manager Vernon P Elarth07/30/03 17 32 <br /> Industrial Solvents by EPA Method 8015B modified- 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 3G23029-EPA 3810 Heads ace <br /> Blank(3G23029-BLK1) Prepared&Analyzed 07/23/03 <br /> Methanol ND 10 mg/kg <br />' Surrogate 1 pentanol 236 250 944 67-171 <br /> Laboratory Control Sample(3G23029-BS1) Prepared&Analyzed 07/23/03 <br /> Methanol 105 10 mg/kg 100 105 76-164 <br />' Surrogate 1-pentanol 235 " 250 940 67-171 <br /> Matrix Spike(3G23029-MSI) Source MMG0493-02 Prepared&Analyzed 07/23/03 <br /> Methanol 618 5 0 mg/kg 500 26 716 76-164 Q-LIM <br /> Surrogate 1 pentanol 268 11250 107 67-171 <br /> Matrix Spike Du (3G23029-MSDI) Source MMG0493-02 Prepared&Analyzed 07/23/03 <br /> ethanol 730 50 mg/kg 500 26 940 76-164 166 25 <br /> rrogate I-pentanol 249 250 996 67-171 <br /> Batch 3G24020-EPA 3810 Headspace <br /> Blank(3G24020-BLKI) Prepared&Analyzed 07/24/03 <br /> Methanol ND 10 mg/kg <br /> Surrogate I-pentanol 238 250 952 67-171 <br /> Laboratory Control Sample(3G24020-BSI) Prepared&Analyzed 07/24/03 <br /> Methanol 977 10 mg/kg 100 977 76-164 <br /> Surrogate 1 pentanol 219 250 876 67-171 <br /> ' Laboratory Control Sample Dup(3G24020-BSDI) Prepared&Analyzed 07/24/03 <br /> Methanol 101 10 mg/kg 100 101 76-164 3 32 25 <br /> Surrogate I-pentanol 221 250 884 67-171 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody doeument Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report mus/be reproduced in its entirety <br /> Page 7 of 13 <br />