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819 Striker Avenue Suite 8 <br /> Sacramento,CA 95834 <br /> 00 <br /> ' Sequoia (916)921-9600 <br /> D Analytical FAX equo labsO: rn <br /> www sequoialabs tom <br /> lta Environmental Consultants(Cameron Park) Project ARCO 2168,Stockton,CA <br /> 0 Cameron Park Dr Ste 550 Proj ect Number 2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager 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 2020216-EPA 5030B [PIT] <br /> Blank(2020216-BLKI) Prepared&Analyzed 02/20/02 <br /> Tert-butyl alcohol ND 5 0 ug/I <br /> Methyl 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 269 25 0 108 60-140 <br /> LCS 2020216-BS1 Prepared&Analyzed 02/20/02 <br /> Methyl tert-butyl ether 27 1 0 50 ug/l 25 0 108 60-140 <br /> Surrogate 12-DCA-d4 285 „ 15 0 114 60-140 <br /> Matrix Spike(2020216-MS1) Source 5202156-14 Prepared&Analyzed 02/20/02 <br /> yl tert-butyl ether 22 8 0 50 ug/l 25 0 1 8 840 60-140 <br /> Surrogate 1 2-DCA-d4 244 " 250 976 60-140 <br /> Matrix Spike Du (2020216-MSDI) Source S202156-14 Prepared&Analyzed 02/20/02 <br /> Methyl tert-butyl ether 28 1 0 50 ugfl 25,0 1 8 105 60-140 20 8 25 <br /> Surrogate 12-DCA-d4 252 250 101 60-140 <br /> Batch 2020231 -EPA 5030E PIT <br /> Blank 2020231-BLK1 Prepared&Analyzed 02/21/02 <br /> Tert-butyl alcohol ND 50 ugll <br /> Methyl 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 050 " <br /> Surrogate 1,2-DCA-d4 269 25 0 108 60-140 <br /> iota Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 15 <br />