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4 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Y Sequoia (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www se9owalabs com <br /> NOW <br /> F <br /> ta Environmental Consultants(Cameron Park) Protect ARCO 2186, Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number 2186, Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Steve Carter 04/25/02 09 59 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical _ Sacramento <br /> Reporting Spike Source %RFC /LPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2030212-EPA 5030B [P/TJ <br /> Matrix Spike Du (2030242-MSD1) Source S203288-01 Prepared&Analyzed 03/20/02 QR-02 <br /> Methyl tert-butyl ether 273 050 ug/l 250 1 9 102 60-140 39 5 25 <br /> Surrogate 1 2-DCA-d4 212 " 250 848 60-140 <br /> Batch 2030255-PPA 5030B [P/TJ <br /> Blank(2030255-BLK1) Prepared 03/20/02 Analyzed 03/22/02 <br /> Tert-buty]alcohol ND 5 0 ug/l <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Surrogate 11-DCA-d4 195 250 780 60-140 <br /> WS(2030255-BSI) Prepared 03/20/02 Analyzed 03/22/02 <br /> Methyl tert-butyl ether 21 3 050 ug/l 250 85 2 60-140 <br /> Surrogate 12-DCA-d4 181 250 724 60-140 <br /> Matrix Spike(2030255-MSI) Source 5203321-05 Prepared 03/20/02 Analyzed 03/22/02 <br /> Methyl tert-butyl ether 21 9 050 ug/l 250 ND 87 1 60-140 <br /> Surrogate 12-DCA-d4 186 11250 744 60-140 <br /> Matrix Spike Du (2030255-MSDI) Source 5203321-05 Prepared 03/20/02 Analyzed 03/22/02 <br /> Methyl tert-butyl ether 21 8 050 ug/l 250 ND 867 60-140 0 458 25 <br /> Surrogate 1 2-DCA-d4 192 2S 0 768 60-140 <br /> quota Analytical - Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 13 <br />