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+1 I <br /> 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequotalabs com <br /> SECOR International-Rancho Cordova Project ARCO 595,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number ARCO 595,Stockton,CA Reported <br /> Rancho Cordova CA,95670 PmJ Manages Musty Benkosky 02/04/02 14 46 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> A�Su Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2020004-EPA 5030B [PIT] <br /> Blank 2020004-BLK1 Prepared&Analyzed 02/01/02 <br /> Tert-butyl alcohol ND 5 0 119/1 <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 /> 1,2-Dichloroethane ND 050 " <br /> Ethylene dibromide ND 050 " <br /> Surrogate 1,2-DCA-d4 230 250 920 60-140 <br /> LCS 2010004-BS1 Prepared&Analyzed 02/01/02 <br /> Methyl tert-butyl ether 21 3 050 ug/l 250 85 2 60-140 <br /> Surrogate 1,2-DCA-d4 211 250 844 60-140 <br /> atriz S ikce 2020004-MS1 Source.5202011-01 Prepared&Analyzed 02/01/02 <br /> thyl tent-butyl ether 23 8 050 49/1 25 0 ND 952 60-140 <br /> Surrogate 12-DCA-d4 224 " 250 896 60-140 <br /> Matrix Spike Dup(2020004-MSDll Source 5202011-01 Prepared&Analyzed 02/01/02 <br /> Methyl tert-butyl ether 224 0 50 119/1 25 0 ND 896 60-140 606 25 <br /> Surrogate 1,2-DCA-d4 208 250 832 60-140 <br /> ' <br /> Sequoia <br /> uoia 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 6 of 8 <br />