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Sequoia <br /> 819 Striker Avenue,Smte 8 <br /> _. Se uoia Sacramento,)9 95834 <br /> q (916)921-9600 <br /> tD Anal tical FAX(916)921-0100 <br /> Y wwwsequoialabs com <br /> eita Environmental Consultants(Cameron Park) Project ARCO 2168,Stockton,CA <br /> 0 Cameron Park Dr Ste 550 Project Number 2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project M—ger* Steve Carter 04/17/02 09 40 <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 %REC Limits RPD Limit Notes <br /> Batch 2020231 -EPA 5030B [P/TJ <br /> LCS(2020231-BS1) Prepared&Analyzed 02/21/02 <br /> Methyl tert-butyl ether 23 8 0 50 ug/l 25 0 95 2 60-140 <br /> Surrogate 1 2-DCA-d4 27 1 " 25 0 108 60-140 <br /> Matrix Spike 2020231-MS1 Source 5202204-10 Prepared&Analyzed 02/21/02 <br /> Methyl tert-butyl ether 21 7 0 50 ug/l 25 0 ND 86 8 60-140 <br /> Surrogate 12-DCA-d4 263 25 0 105 60-140 <br /> Matrix Spike Du 2020231-MSD1 Source 5202204-10 Prepared&Analyzed 02/21/02 <br /> Methyl tent-butyl ether 23 0 0 50 ug/l 25 0 ND 920 60-140 5 82 25 <br /> Surrogate 1 2-DCA-d4 269 25 0 108 60-140 <br /> Batch 2020259-EPA 5030B [P/TJ <br /> Blank(2020259-BLKI) Prepared&Analyzed 02/22/02 <br /> 0 butyl alcohol ND 5 0 ug/l <br /> yl 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 /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Surrogate 12-DCA-d4 22 7 25 0 908 60-140 <br /> LC5 2020259-BS11 Prepared&Analyzed 02/22/02 <br /> Methyl tent-butyl ether 26 3 0 50 ug/I 25 0 105 60-140 <br /> Surrogate 1 2-DCA-d4 259 1125 0 104 60-140 <br /> oia Analytical- Sacramento The results in this report apply to the samples analyzed m accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 13 of 15 <br />